Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[mwall]

and now i see that JD made the same suggestion.  apologies for being late 
to the party.  i'm working my way through 300 weewx emails...

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[mwall]

dan,

it is quite possible that the driver is coded incorrectly.  luc and i did 
the development and testing of the ws28xx driver, and all three locations 
were within 200 feet of sea level.  so it is quite possible that the device 
reports barometer, not pressure.  (if the device reports barometer, then it 
must have some way for a user to calibrate it, and i do not recall whether 
that is an explicit altitude or if it is an adjustment to the sensor output)

anyway, just change 'pressure' to 'barometer' in the driver, then restart 
weewx.  there are two places where this happens - one for loop data, one 
for historical data.

for loop data, change this:

packet['pressure']= get_datum_diff(data._PressureRelative_hPa,

to this:

packet['barometer']= get_datum_diff(data._PressureRelative_hPa,

for historical data, change this:

'pressure': self.PressureRelative,

to this:

'barometer': self.PressureRelative,



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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Thanks Les, I will give this a go.  Will be a couple days though before I 
can get to it.  I'll report my findings.

On Thursday, February 20, 2020 at 2:09:44 PM UTC-8, ln77 wrote:
>
> JD said that he “suspects” that would be the right change.  It would help 
> if you tested it, but be prepared for it not to work or break the driver. 
>  Save the original version of the file, and restart weewx after changing it 
> in order to load the new version.
>
> The location of the driver can depend on the type of OS and how you 
> installed weewx.  On my raspberry pi, it 
> is /usr/share/weewx/weewx/drivers/ws28xx.py.
>
>   -Les
>
>
>
> On 20 Feb 2020, at 13:31, Dan Blanchard > 
> wrote:
>
> I was under the impression that what JD wrote was a change I can make to 
> the driver.  If so, how can I access the driver to modify it?
>
> On Thursday, February 20, 2020 at 12:39:43 AM UTC-8, ln77 wrote:
>>
>> I thought your questions were answered: what you’ve done is a workaround. 
>> Fundamentally, it’s not a limitation of the LaCrosse hardware, it’s a bug 
>> in the driver.  
>>
>>   -Les
>>
>>
>>
>> On 19 Feb 2020, at 12:05, Dan Blanchard  wrote:
>>
>> Where did you all go?  I was hoping for some comments on my last post.  
>> Does everything I state seem correct?
>>
>> On Monday, February 17, 2020 at 8:20:34 AM UTC-8, Dan Blanchard wrote:
>>>
>>> OK guys, thanks for all the help on this.  Jerry, I assume that the info 
>>> below is in the driver for my WS-28xx and if that is the case, where is 
>>> that driver located?  
>>>
>>> Next, I want to clarify something... I have used the calculator at 
>>> http://www.csgnetwork.com/barcorrecthcalc.html to set my altitude 
>>> (2,320 ft.) and an observed pressure of 30.16 inHg as reported for my area (
>>> https://tinyurl.com/yx65ckcm).  This gives me an adjustment of -2.43 so 
>>> I have set my station pressure to 27.73 inHg. This is now reporting 30.35 
>>> inHg barometer reading at Weather Underground (WU).  Although this is 
>>> working, I feel as if it a work-around but maybe it is just a limitation of 
>>> my station?  Thoughts...
>>>
>>> On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:

 Hi,
 I am using the ws23xx driver on ws2316 hardware and this driver sends 
 absolute pressure to weewx in the packet as "pressure" ..
 The ws28xx hardware sends relative pressure and the ws28xx driver also 
 sends the reading to weewx in the packet as pressure. See below

 packet['*pressure*']= get_datum_diff(data._PressureRelative_hPa,
   
  CWeatherTraits.PressureNP(),
   
  CWeatherTraits.PressureOFL())

 I suspect the code should read.
 packet['*barometer*']= get_datum_diff(data._PressureRelative_hPa,
   
  CWeatherTraits.PressureNP(),
   
  CWeatherTraits.PressureOFL())
 Or you could just change the altitude of the station as Andrew suggest.

 Jerry

 On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
>
> I've been running my weather station on weeWX for 2 days now after 
> switching from a PC based solution for the past several years.  I noticed 
> this problem after noticing that my station is no longer showing on the 
> WeatherUnderground (WU) maps.  The data is still showing for my site on 
> WU 
> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>
> Everything has been going fine except I am currently having a problem 
> with data inaccuracies.  All the data seems correct except the barometer 
> reading.  The reading on my hardware is currently 30.30 and weeWX is 
> showing 33.093 which is what is reporting to WU.
>
> Can anyone please shed some light on this issue?  I've attached the 
> syslog for reference.  Please let me know if there is anything else I can 
> provide to help with this situation. If the solution requires changes in 
> the configuration file, please be specific as I am still learning the 
> Linux 
> stuff.
>
> Thanks,
>
> Dan
>
>
> Hardware: Lacrosse WS-2813
>
>
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>>  
>> 
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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

JD said that he “suspects” that would be the right change.  It would help if 
you tested it, but be prepared for it not to work or break the driver.  Save 
the original version of the file, and restart weewx after changing it in order 
to load the new version.

The location of the driver can depend on the type of OS and how you installed 
weewx.  On my raspberry pi, it is /usr/share/weewx/weewx/drivers/ws28xx.py.

  -Les



> On 20 Feb 2020, at 13:31, Dan Blanchard  wrote:
> 
> I was under the impression that what JD wrote was a change I can make to the 
> driver.  If so, how can I access the driver to modify it?
> 
> On Thursday, February 20, 2020 at 12:39:43 AM UTC-8, ln77 wrote:
> I thought your questions were answered: what you’ve done is a workaround. 
> Fundamentally, it’s not a limitation of the LaCrosse hardware, it’s a bug in 
> the driver.  
> 
>   -Les
> 
> 
> 
>> On 19 Feb 2020, at 12:05, Dan Blanchard > wrote:
>> 
>> Where did you all go?  I was hoping for some comments on my last post.  Does 
>> everything I state seem correct?
>> 
>> On Monday, February 17, 2020 at 8:20:34 AM UTC-8, Dan Blanchard wrote:
>> OK guys, thanks for all the help on this.  Jerry, I assume that the info 
>> below is in the driver for my WS-28xx and if that is the case, where is that 
>> driver located?  
>> 
>> Next, I want to clarify something... I have used the calculator at 
>> http://www.csgnetwork.com/barcorrecthcalc.html 
>>  to set my altitude (2,320 
>> ft.) and an observed pressure of 30.16 inHg as reported for my area 
>> (https://tinyurl.com/yx65ckcm ).  This gives 
>> me an adjustment of -2.43 so I have set my station pressure to 27.73 inHg. 
>> This is now reporting 30.35 inHg barometer reading at Weather Underground 
>> (WU).  Although this is working, I feel as if it a work-around but maybe it 
>> is just a limitation of my station?  Thoughts...
>> 
>> On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:
>> Hi,
>> I am using the ws23xx driver on ws2316 hardware and this driver sends 
>> absolute pressure to weewx in the packet as "pressure" ..
>> The ws28xx hardware sends relative pressure and the ws28xx driver also sends 
>> the reading to weewx in the packet as pressure. See below
>> 
>> packet['pressure']= get_datum_diff(data._PressureRelative_hPa,
>>CWeatherTraits.PressureNP(),
>>CWeatherTraits.PressureOFL())
>> 
>> I suspect the code should read.
>> packet['barometer']= get_datum_diff(data._PressureRelative_hPa,
>>CWeatherTraits.PressureNP(),
>>CWeatherTraits.PressureOFL())
>> Or you could just change the altitude of the station as Andrew suggest.
>> 
>> Jerry
>> 
>> On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
>> I've been running my weather station on weeWX for 2 days now after switching 
>> from a PC based solution for the past several years.  I noticed this problem 
>> after noticing that my station is no longer showing on the 
>> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
>> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43 
>> )
>> 
>> Everything has been going fine except I am currently having a problem with 
>> data inaccuracies.  All the data seems correct except the barometer reading. 
>>  The reading on my hardware is currently 30.30 and weeWX is showing 33.093 
>> which is what is reporting to WU.
>> 
>> Can anyone please shed some light on this issue?  I've attached the syslog 
>> for reference.  Please let me know if there is anything else I can provide 
>> to help with this situation. If the solution requires changes in the 
>> configuration file, please be specific as I am still learning the Linux 
>> stuff.
>> 
>> Thanks,
>> 
>> Dan
>> 
>> 
>> Hardware: Lacrosse WS-2813
>> 
>> 
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>> "weewx-user" group.
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>>  
>> .
> 
> 
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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

I was under the impression that what JD wrote was a change I can make to 
the driver.  If so, how can I access the driver to modify it?

On Thursday, February 20, 2020 at 12:39:43 AM UTC-8, ln77 wrote:
>
> I thought your questions were answered: what you’ve done is a workaround. 
> Fundamentally, it’s not a limitation of the LaCrosse hardware, it’s a bug 
> in the driver.  
>
>   -Les
>
>
>
> On 19 Feb 2020, at 12:05, Dan Blanchard > 
> wrote:
>
> Where did you all go?  I was hoping for some comments on my last post.  
> Does everything I state seem correct?
>
> On Monday, February 17, 2020 at 8:20:34 AM UTC-8, Dan Blanchard wrote:
>>
>> OK guys, thanks for all the help on this.  Jerry, I assume that the info 
>> below is in the driver for my WS-28xx and if that is the case, where is 
>> that driver located?  
>>
>> Next, I want to clarify something... I have used the calculator at 
>> http://www.csgnetwork.com/barcorrecthcalc.html to set my altitude (2,320 
>> ft.) and an observed pressure of 30.16 inHg as reported for my area (
>> https://tinyurl.com/yx65ckcm).  This gives me an adjustment of -2.43 so 
>> I have set my station pressure to 27.73 inHg. This is now reporting 30.35 
>> inHg barometer reading at Weather Underground (WU).  Although this is 
>> working, I feel as if it a work-around but maybe it is just a limitation of 
>> my station?  Thoughts...
>>
>> On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:
>>>
>>> Hi,
>>> I am using the ws23xx driver on ws2316 hardware and this driver sends 
>>> absolute pressure to weewx in the packet as "pressure" ..
>>> The ws28xx hardware sends relative pressure and the ws28xx driver also 
>>> sends the reading to weewx in the packet as pressure. See below
>>>
>>> packet['*pressure*']= get_datum_diff(data._PressureRelative_hPa,
>>>   
>>>  CWeatherTraits.PressureNP(),
>>>   
>>>  CWeatherTraits.PressureOFL())
>>>
>>> I suspect the code should read.
>>> packet['*barometer*']= get_datum_diff(data._PressureRelative_hPa,
>>>   
>>>  CWeatherTraits.PressureNP(),
>>>   
>>>  CWeatherTraits.PressureOFL())
>>> Or you could just change the altitude of the station as Andrew suggest.
>>>
>>> Jerry
>>>
>>> On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:

 I've been running my weather station on weeWX for 2 days now after 
 switching from a PC based solution for the past several years.  I noticed 
 this problem after noticing that my station is no longer showing on the 
 WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
 though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)

 Everything has been going fine except I am currently having a problem 
 with data inaccuracies.  All the data seems correct except the barometer 
 reading.  The reading on my hardware is currently 30.30 and weeWX is 
 showing 33.093 which is what is reporting to WU.

 Can anyone please shed some light on this issue?  I've attached the 
 syslog for reference.  Please let me know if there is anything else I can 
 provide to help with this situation. If the solution requires changes in 
 the configuration file, please be specific as I am still learning the 
 Linux 
 stuff.

 Thanks,

 Dan


 Hardware: Lacrosse WS-2813


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>  
> 
> .
>
>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

I thought your questions were answered: what you’ve done is a workaround. 
Fundamentally, it’s not a limitation of the LaCrosse hardware, it’s a bug in 
the driver.  

  -Les



> On 19 Feb 2020, at 12:05, Dan Blanchard  wrote:
> 
> Where did you all go?  I was hoping for some comments on my last post.  Does 
> everything I state seem correct?
> 
> On Monday, February 17, 2020 at 8:20:34 AM UTC-8, Dan Blanchard wrote:
> OK guys, thanks for all the help on this.  Jerry, I assume that the info 
> below is in the driver for my WS-28xx and if that is the case, where is that 
> driver located?  
> 
> Next, I want to clarify something... I have used the calculator at 
> http://www.csgnetwork.com/barcorrecthcalc.html 
>  to set my altitude (2,320 
> ft.) and an observed pressure of 30.16 inHg as reported for my area 
> (https://tinyurl.com/yx65ckcm ).  This gives me 
> an adjustment of -2.43 so I have set my station pressure to 27.73 inHg. This 
> is now reporting 30.35 inHg barometer reading at Weather Underground (WU).  
> Although this is working, I feel as if it a work-around but maybe it is just 
> a limitation of my station?  Thoughts...
> 
> On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:
> Hi,
> I am using the ws23xx driver on ws2316 hardware and this driver sends 
> absolute pressure to weewx in the packet as "pressure" ..
> The ws28xx hardware sends relative pressure and the ws28xx driver also sends 
> the reading to weewx in the packet as pressure. See below
> 
> packet['pressure']= get_datum_diff(data._PressureRelative_hPa,
>CWeatherTraits.PressureNP(),
>CWeatherTraits.PressureOFL())
> 
> I suspect the code should read.
> packet['barometer']= get_datum_diff(data._PressureRelative_hPa,
>CWeatherTraits.PressureNP(),
>CWeatherTraits.PressureOFL())
> Or you could just change the altitude of the station as Andrew suggest.
> 
> Jerry
> 
> On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
> I've been running my weather station on weeWX for 2 days now after switching 
> from a PC based solution for the past several years.  I noticed this problem 
> after noticing that my station is no longer showing on the WeatherUnderground 
> (WU) maps.  The data is still showing for my site on WU though 
> (https://www.wunderground.com/dashboard/pws/KIDPOSTF43 
> )
> 
> Everything has been going fine except I am currently having a problem with 
> data inaccuracies.  All the data seems correct except the barometer reading.  
> The reading on my hardware is currently 30.30 and weeWX is showing 33.093 
> which is what is reporting to WU.
> 
> Can anyone please shed some light on this issue?  I've attached the syslog 
> for reference.  Please let me know if there is anything else I can provide to 
> help with this situation. If the solution requires changes in the 
> configuration file, please be specific as I am still learning the Linux stuff.
> 
> Thanks,
> 
> Dan
> 
> 
> Hardware: Lacrosse WS-2813
> 
> 
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>  
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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Where did you all go?  I was hoping for some comments on my last post.  
Does everything I state seem correct?

On Monday, February 17, 2020 at 8:20:34 AM UTC-8, Dan Blanchard wrote:
>
> OK guys, thanks for all the help on this.  Jerry, I assume that the info 
> below is in the driver for my WS-28xx and if that is the case, where is 
> that driver located?  
>
> Next, I want to clarify something... I have used the calculator at 
> http://www.csgnetwork.com/barcorrecthcalc.html to set my altitude (2,320 
> ft.) and an observed pressure of 30.16 inHg as reported for my area (
> https://tinyurl.com/yx65ckcm).  This gives me an adjustment of -2.43 so I 
> have set my station pressure to 27.73 inHg. This is now reporting 30.35 
> inHg barometer reading at Weather Underground (WU).  Although this is 
> working, I feel as if it a work-around but maybe it is just a limitation of 
> my station?  Thoughts...
>
> On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:
>>
>> Hi,
>> I am using the ws23xx driver on ws2316 hardware and this driver sends 
>> absolute pressure to weewx in the packet as "pressure" ..
>> The ws28xx hardware sends relative pressure and the ws28xx driver also 
>> sends the reading to weewx in the packet as pressure. See below
>>
>> packet['*pressure*']= get_datum_diff(data._PressureRelative_hPa,
>>   
>>  CWeatherTraits.PressureNP(),
>>   
>>  CWeatherTraits.PressureOFL())
>>
>> I suspect the code should read.
>> packet['*barometer*']= get_datum_diff(data._PressureRelative_hPa,
>>   
>>  CWeatherTraits.PressureNP(),
>>   
>>  CWeatherTraits.PressureOFL())
>> Or you could just change the altitude of the station as Andrew suggest.
>>
>> Jerry
>>
>> On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
>>>
>>> I've been running my weather station on weeWX for 2 days now after 
>>> switching from a PC based solution for the past several years.  I noticed 
>>> this problem after noticing that my station is no longer showing on the 
>>> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
>>> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>>>
>>> Everything has been going fine except I am currently having a problem 
>>> with data inaccuracies.  All the data seems correct except the barometer 
>>> reading.  The reading on my hardware is currently 30.30 and weeWX is 
>>> showing 33.093 which is what is reporting to WU.
>>>
>>> Can anyone please shed some light on this issue?  I've attached the 
>>> syslog for reference.  Please let me know if there is anything else I can 
>>> provide to help with this situation. If the solution requires changes in 
>>> the configuration file, please be specific as I am still learning the Linux 
>>> stuff.
>>>
>>> Thanks,
>>>
>>> Dan
>>>
>>>
>>> Hardware: Lacrosse WS-2813
>>>
>>>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

OK guys, thanks for all the help on this.  Jerry, I assume that the info 
below is in the driver for my WS-28xx and if that is the case, where is 
that driver located?  

Next, I want to clarify something... I have used the calculator at 
http://www.csgnetwork.com/barcorrecthcalc.html to set my altitude (2,320 
ft.) and an observed pressure of 30.16 inHg as reported for my area (
https://tinyurl.com/yx65ckcm).  This gives me an adjustment of -2.43 so I 
have set my station pressure to 27.73 inHg. This is now reporting 30.35 
inHg barometer reading at Weather Underground (WU).  Although this is 
working, I feel as if it a work-around but maybe it is just a limitation of 
my station?  Thoughts...

On Sunday, February 16, 2020 at 9:44:46 PM UTC-8, J D wrote:
>
> Hi,
> I am using the ws23xx driver on ws2316 hardware and this driver sends 
> absolute pressure to weewx in the packet as "pressure" ..
> The ws28xx hardware sends relative pressure and the ws28xx driver also 
> sends the reading to weewx in the packet as pressure. See below
>
> packet['*pressure*']= get_datum_diff(data._PressureRelative_hPa,
>CWeatherTraits.PressureNP(),
>   
>  CWeatherTraits.PressureOFL())
>
> I suspect the code should read.
> packet['*barometer*']= get_datum_diff(data._PressureRelative_hPa,
>CWeatherTraits.PressureNP(),
>   
>  CWeatherTraits.PressureOFL())
> Or you could just change the altitude of the station as Andrew suggest.
>
> Jerry
>
> On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
>>
>> I've been running my weather station on weeWX for 2 days now after 
>> switching from a PC based solution for the past several years.  I noticed 
>> this problem after noticing that my station is no longer showing on the 
>> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
>> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>>
>> Everything has been going fine except I am currently having a problem 
>> with data inaccuracies.  All the data seems correct except the barometer 
>> reading.  The reading on my hardware is currently 30.30 and weeWX is 
>> showing 33.093 which is what is reporting to WU.
>>
>> Can anyone please shed some light on this issue?  I've attached the 
>> syslog for reference.  Please let me know if there is anything else I can 
>> provide to help with this situation. If the solution requires changes in 
>> the configuration file, please be specific as I am still learning the Linux 
>> stuff.
>>
>> Thanks,
>>
>> Dan
>>
>>
>> Hardware: Lacrosse WS-2813
>>
>>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[J D]

Hi,
I am using the ws23xx driver on ws2316 hardware and this driver sends 
absolute pressure to weewx in the packet as "pressure" ..
The ws28xx hardware sends relative pressure and the ws28xx driver also 
sends the reading to weewx in the packet as pressure. See below

packet['*pressure*']= get_datum_diff(data._PressureRelative_hPa,
   CWeatherTraits.PressureNP(),
   CWeatherTraits.PressureOFL())

I suspect the code should read.
packet['*barometer*']= get_datum_diff(data._PressureRelative_hPa,
   CWeatherTraits.PressureNP(),
   CWeatherTraits.PressureOFL())
Or you could just change the altitude of the station as Andrew suggest.

Jerry

On Sunday, February 9, 2020 at 4:36:51 PM UTC-7, Dan Blanchard wrote:
>
> I've been running my weather station on weeWX for 2 days now after 
> switching from a PC based solution for the past several years.  I noticed 
> this problem after noticing that my station is no longer showing on the 
> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>
> Everything has been going fine except I am currently having a problem with 
> data inaccuracies.  All the data seems correct except the barometer 
> reading.  The reading on my hardware is currently 30.30 and weeWX is 
> showing 33.093 which is what is reporting to WU.
>
> Can anyone please shed some light on this issue?  I've attached the syslog 
> for reference.  Please let me know if there is anything else I can provide 
> to help with this situation. If the solution requires changes in the 
> configuration file, please be specific as I am still learning the Linux 
> stuff.
>
> Thanks,
>
> Dan
>
>
> Hardware: Lacrosse WS-2813
>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

well if it is hard coded for pressure then the station adjustment made by 
the OP should be to set his station to a known sea level pressure and 
subtract a correction for altitude (2.6 for 2300 ft I think) and all should 
then be ok

On Monday, 17 February 2020 07:09:35 UTC+2, ln77 wrote:
>
> Setting those that way won’t fix the problem.  Those settings are hints to 
> weewx about what to use when the weather station hardware provides multiple 
> values.  The WS28XX driver is hard-coded to interpret the data from the 
> station as weewx “pressure,” and that is the only pressure-related datum 
> sent by the WS28XX stations.  
>
>   -Les
>
>
>
> On 16 Feb 2020, at 17:09, Dan Blanchard > 
> wrote:
>
> Andrew, I've set barometer = hardware and altimeter = software and 
> pressure = software.  I've restarted weewx, but nothing has changed in the 
> Loop.
>
> On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote:
>>
>> if indeed, and i now tend to agree, the station displays and outputs a 
>> manually adjusted barometer which is set to a sea level reading from local 
>> weather stations and not pressure then barometer should be set to hardware 
>> and pressure and altimeter set to software, and not as i previously 
>> suggested.
>>
>> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:
>>>
>>> OK… The “pressure” that your station is displaying is what it should be 
>>> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
>>> this is called “barometer” because that is what weather stations report for 
>>> barometric pressure.  “Altimeter” is basically the same thing; there are 
>>> differences in exactly how it is corrected, but those differences are minor 
>>> and can be ignored for now.  The distinction between what weewx calls 
>>> “barometer” and “pressure” is important, though, for anyone more than a few 
>>> hundred feet above sea level.  
>>>
>>> From the manual, it appears that the WS-2813 uses a simple method for 
>>> correcting to sea level, by allowing the user to adjust a correction factor 
>>> that is applied to the actual measured pressure until the reading matches 
>>> some local reference barometric pressure report.  This automatically also 
>>> corrects for any errors in the pressure sensor itself, a handy bonus. 
>>> There’s not reference in the manual to any other kind of pressure being 
>>> reported, so it only makes sense that what it transmits via the USB 
>>> interface is also this corrected pressure, i.e., “barometer.”  But the 
>>> WS28XX driver documentation, and as far as I can tell the code also, assume 
>>> that the pressure reading fro the hardware is what weewx calls “pressure,” 
>>> that is, the actual ambient pressure before correction for altitude.  As 
>>> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
>>> yours and actually send the corrected barometer reading. Maybe because the 
>>> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
>>> as raw pressure reading in the driver. 
>>>
>>> The bottom line is, I’m pretty sure the issue is that the driver is 
>>> wrong.  I’m not familiar enough with that part of the weewx code to offer a 
>>> fix, but it should be pretty simple for someone who is familiar with that 
>>> code.  
>>>
>>>   -Les
>>>
>>>
>>>
>>> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
>>>
>>> It is likely that I am mis-using the terms altimeter, barometer, and 
>>> pressure.  I'll clarify what I mean here.  
>>>
>>> What I previously defined as 'correct' pressure is that the pressure 
>>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
>>> Service barometer reading (
>>> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>>>  
>>> For example, *right now* my station is reading 30.06 pressure and the 
>>> NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
>>> pressure reading to match the WU pressure reading (
>>> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
>>> appears that WU is reading the weewx barometer reading.  Is there a way to 
>>> have weewx report the pressure reading to WU?
>>>
>>> My WS-2813 outputs the manually adjusted pressure in the Loop records 
>>> (see attachment).  I don't see a way to change that.  Here is a link to the 
>>> manual (
>>> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>>> ).
>>>
>>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:

 I would expect you to be reporting barometer = sea level pressure which 
 is pressure adjusted for temperature and altitude because weather stations 
 always report sea level pressures.

 Is what you call 'correct' pressure the raw pressure of the instrument 
 or a pressure which you have set.  Does the station output the raw 
 pressure 
 or the manually adjusted pressure in the loop re

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

Setting those that way won’t fix the problem.  Those settings are hints to 
weewx about what to use when the weather station hardware provides multiple 
values.  The WS28XX driver is hard-coded to interpret the data from the station 
as weewx “pressure,” and that is the only pressure-related datum sent by the 
WS28XX stations.  

  -Les



> On 16 Feb 2020, at 17:09, Dan Blanchard  wrote:
> 
> Andrew, I've set barometer = hardware and altimeter = software and pressure = 
> software.  I've restarted weewx, but nothing has changed in the Loop.
> 
> On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote:
> if indeed, and i now tend to agree, the station displays and outputs a 
> manually adjusted barometer which is set to a sea level reading from local 
> weather stations and not pressure then barometer should be set to hardware 
> and pressure and altimeter set to software, and not as i previously suggested.
> 
> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:
> OK… The “pressure” that your station is displaying is what it should be 
> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
> this is called “barometer” because that is what weather stations report for 
> barometric pressure.  “Altimeter” is basically the same thing; there are 
> differences in exactly how it is corrected, but those differences are minor 
> and can be ignored for now.  The distinction between what weewx calls 
> “barometer” and “pressure” is important, though, for anyone more than a few 
> hundred feet above sea level.  
> 
> From the manual, it appears that the WS-2813 uses a simple method for 
> correcting to sea level, by allowing the user to adjust a correction factor 
> that is applied to the actual measured pressure until the reading matches 
> some local reference barometric pressure report.  This automatically also 
> corrects for any errors in the pressure sensor itself, a handy bonus. There’s 
> not reference in the manual to any other kind of pressure being reported, so 
> it only makes sense that what it transmits via the USB interface is also this 
> corrected pressure, i.e., “barometer.”  But the WS28XX driver documentation, 
> and as far as I can tell the code also, assume that the pressure reading fro 
> the hardware is what weewx calls “pressure,” that is, the actual ambient 
> pressure before correction for altitude.  As far as I can tell, all of the 
> WS28XX LaCrosse stations work the same way as yours and actually send the 
> corrected barometer reading. Maybe because the LaCrosse documentation calls 
> it “pressure,” it was mistakenly interpreted as raw pressure reading in the 
> driver. 
> 
> The bottom line is, I’m pretty sure the issue is that the driver is wrong.  
> I’m not familiar enough with that part of the weewx code to offer a fix, but 
> it should be pretty simple for someone who is familiar with that code.  
> 
>   -Les
> 
> 
> 
>> On 14 Feb 2020, at 19:44, Dan Blanchard > wrote:
>> 
>> It is likely that I am mis-using the terms altimeter, barometer, and 
>> pressure.  I'll clarify what I mean here.  
>> 
>> What I previously defined as 'correct' pressure is that the pressure 
>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
>> Service barometer reading 
>> (https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk
>>  
>> ).
>>  For example, right now my station is reading 30.06 pressure and the NWS 
>> site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
>> pressure reading to match the WU pressure reading 
>> (https://www.wunderground.com/dashboard/pws/KIDPOSTF43 
>> ).  Right now it 
>> appears that WU is reading the weewx barometer reading.  Is there a way to 
>> have weewx report the pressure reading to WU?
>> 
>> My WS-2813 outputs the manually adjusted pressure in the Loop records (see 
>> attachment).  I don't see a way to change that.  Here is a link to the 
>> manual 
>> (https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>>  
>> ).
>> 
>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>> I would expect you to be reporting barometer = sea level pressure which is 
>> pressure adjusted for temperature and altitude because weather stations 
>> always report sea level pressures.
>> 
>> Is what you call 'correct' pressure the raw pressure of the instrument or a 
>> pressure which you have set.  Does the station output the raw pressure or 
>> the manually adjusted pressure in the loop records?
>> 
>> 
>> 
>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>> Andrew, that's a good questions; let me clarify.  
>> 
>> This issue started when Weather Undergrou

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

Andrew,

I know Wikipedia has its issues but when you consider the pressures posted 
here and this  
I think it is pretty clear there is an issue with the OPs pressures.

Gary

On Monday, 17 February 2020 13:41:43 UTC+10, Andrew Milner wrote:
>
> pressure, barometer and altimeter look reasonable to me.  why are they 
> wrong?
>
>
>
>
> On Monday, 17 February 2020 03:09:28 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, I've set barometer = hardware and altimeter = software and 
>> pressure = software.  I've restarted weewx, but nothing has changed in the 
>> Loop.
>>
>> On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote:
>>>
>>> if indeed, and i now tend to agree, the station displays and outputs a 
>>> manually adjusted barometer which is set to a sea level reading from local 
>>> weather stations and not pressure then barometer should be set to hardware 
>>> and pressure and altimeter set to software, and not as i previously 
>>> suggested.
>>>
>>> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:

 OK… The “pressure” that your station is displaying is what it should be 
 displaying: the ambient air pressure, correct for your altitude.  In 
 weewx, 
 this is called “barometer” because that is what weather stations report 
 for 
 barometric pressure.  “Altimeter” is basically the same thing; there are 
 differences in exactly how it is corrected, but those differences are 
 minor 
 and can be ignored for now.  The distinction between what weewx calls 
 “barometer” and “pressure” is important, though, for anyone more than a 
 few 
 hundred feet above sea level.  

 From the manual, it appears that the WS-2813 uses a simple method for 
 correcting to sea level, by allowing the user to adjust a correction 
 factor 
 that is applied to the actual measured pressure until the reading matches 
 some local reference barometric pressure report.  This automatically also 
 corrects for any errors in the pressure sensor itself, a handy bonus. 
 There’s not reference in the manual to any other kind of pressure being 
 reported, so it only makes sense that what it transmits via the USB 
 interface is also this corrected pressure, i.e., “barometer.”  But the 
 WS28XX driver documentation, and as far as I can tell the code also, 
 assume 
 that the pressure reading fro the hardware is what weewx calls “pressure,” 
 that is, the actual ambient pressure before correction for altitude.  As 
 far as I can tell, all of the WS28XX LaCrosse stations work the same way 
 as 
 yours and actually send the corrected barometer reading. Maybe because the 
 LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
 as raw pressure reading in the driver. 

 The bottom line is, I’m pretty sure the issue is that the driver is 
 wrong.  I’m not familiar enough with that part of the weewx code to offer 
 a 
 fix, but it should be pretty simple for someone who is familiar with that 
 code.  

   -Les



 On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:

 It is likely that I am mis-using the terms altimeter, barometer, and 
 pressure.  I'll clarify what I mean here.  

 What I previously defined as 'correct' pressure is that the pressure 
 reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
 Service barometer reading (
 https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
  
 For example, *right now* my station is reading 30.06 pressure and the 
 NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
 pressure reading to match the WU pressure reading (
 https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
 appears that WU is reading the weewx barometer reading.  Is there a way to 
 have weewx report the pressure reading to WU?

 My WS-2813 outputs the manually adjusted pressure in the Loop records 
 (see attachment).  I don't see a way to change that.  Here is a link to 
 the 
 manual (
 https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
 ).

 On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>
> I would expect you to be reporting barometer = sea level pressure 
> which is pressure adjusted for temperature and altitude because weather 
> stations always report sea level pressures.
>
> Is what you call 'correct' pressure the raw pressure of the instrument 
> or a pressure which you have set.  Does the station output the raw 
> pressure 
> or the manually adjusted pressure in the loop records?
>
>
>
> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>>
>>>

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

pressure, barometer and altimeter look reasonable to me.  why are they 
wrong?




On Monday, 17 February 2020 03:09:28 UTC+2, Dan Blanchard wrote:
>
> Andrew, I've set barometer = hardware and altimeter = software and 
> pressure = software.  I've restarted weewx, but nothing has changed in the 
> Loop.
>
> On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote:
>>
>> if indeed, and i now tend to agree, the station displays and outputs a 
>> manually adjusted barometer which is set to a sea level reading from local 
>> weather stations and not pressure then barometer should be set to hardware 
>> and pressure and altimeter set to software, and not as i previously 
>> suggested.
>>
>> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:
>>>
>>> OK… The “pressure” that your station is displaying is what it should be 
>>> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
>>> this is called “barometer” because that is what weather stations report for 
>>> barometric pressure.  “Altimeter” is basically the same thing; there are 
>>> differences in exactly how it is corrected, but those differences are minor 
>>> and can be ignored for now.  The distinction between what weewx calls 
>>> “barometer” and “pressure” is important, though, for anyone more than a few 
>>> hundred feet above sea level.  
>>>
>>> From the manual, it appears that the WS-2813 uses a simple method for 
>>> correcting to sea level, by allowing the user to adjust a correction factor 
>>> that is applied to the actual measured pressure until the reading matches 
>>> some local reference barometric pressure report.  This automatically also 
>>> corrects for any errors in the pressure sensor itself, a handy bonus. 
>>> There’s not reference in the manual to any other kind of pressure being 
>>> reported, so it only makes sense that what it transmits via the USB 
>>> interface is also this corrected pressure, i.e., “barometer.”  But the 
>>> WS28XX driver documentation, and as far as I can tell the code also, assume 
>>> that the pressure reading fro the hardware is what weewx calls “pressure,” 
>>> that is, the actual ambient pressure before correction for altitude.  As 
>>> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
>>> yours and actually send the corrected barometer reading. Maybe because the 
>>> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
>>> as raw pressure reading in the driver. 
>>>
>>> The bottom line is, I’m pretty sure the issue is that the driver is 
>>> wrong.  I’m not familiar enough with that part of the weewx code to offer a 
>>> fix, but it should be pretty simple for someone who is familiar with that 
>>> code.  
>>>
>>>   -Les
>>>
>>>
>>>
>>> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
>>>
>>> It is likely that I am mis-using the terms altimeter, barometer, and 
>>> pressure.  I'll clarify what I mean here.  
>>>
>>> What I previously defined as 'correct' pressure is that the pressure 
>>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
>>> Service barometer reading (
>>> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>>>  
>>> For example, *right now* my station is reading 30.06 pressure and the 
>>> NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
>>> pressure reading to match the WU pressure reading (
>>> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
>>> appears that WU is reading the weewx barometer reading.  Is there a way to 
>>> have weewx report the pressure reading to WU?
>>>
>>> My WS-2813 outputs the manually adjusted pressure in the Loop records 
>>> (see attachment).  I don't see a way to change that.  Here is a link to the 
>>> manual (
>>> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>>> ).
>>>
>>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:

 I would expect you to be reporting barometer = sea level pressure which 
 is pressure adjusted for temperature and altitude because weather stations 
 always report sea level pressures.

 Is what you call 'correct' pressure the raw pressure of the instrument 
 or a pressure which you have set.  Does the station output the raw 
 pressure 
 or the manually adjusted pressure in the loop records?



 On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>
> Andrew, that's a good questions; let me clarify.  
>
> This issue started when Weather Underground (WU) stopped showing my 
> station on the maps. I found out that was because I was reporting an 
> incorrect barometric 'pressure.'  As I dug into the details I found that 
> my *station 
> *was displaying the correct pressure (29.xx) but by the time it got 
> to WU, it was displaying the barometer reading (32.xx) from weewx

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

I don't know who Matthew is, but I am eagerly awaiting his input.  Thanks.

On Saturday, February 15, 2020 at 6:13:15 AM UTC-8, Thomas Keffer wrote:
>
> This is Matthew's baby. Matthew?
>
> -tk
>
> On Fri, Feb 14, 2020 at 10:11 PM gjr80 > 
> wrote:
>
>> As this thread has drawn on I agree the solution is in the driver. I 
>> found it had to believe that a driver could have been around for so long 
>> with an incorrect 'pressure' being used and the issue never having come up 
>> before. Sure enough, this thread 
>>  
>> from 2016 bears a remarkable similarity to the issue here. It also seems 
>> that Tom acknowledged that the WS2813 actually outputs altimeter not 
>> pressure as coded in the driver. Later in the thread there are suggested 
>> changes to the driver but it gets a bit murky around some corrections that 
>> are being applied within StdCaibrate. Seems no changes were ever made to 
>> the driver though. Might be worthwhile for Tom or Matthew to revisit this.
>>
>> Gary
>>
>> On Saturday, 15 February 2020 14:22:07 UTC+10, ln77 wrote:
>>>
>>> OK… The “pressure” that your station is displaying is what it should be 
>>> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
>>> this is called “barometer” because that is what weather stations report for 
>>> barometric pressure.  “Altimeter” is basically the same thing; there are 
>>> differences in exactly how it is corrected, but those differences are minor 
>>> and can be ignored for now.  The distinction between what weewx calls 
>>> “barometer” and “pressure” is important, though, for anyone more than a few 
>>> hundred feet above sea level.  
>>>
>>> From the manual, it appears that the WS-2813 uses a simple method for 
>>> correcting to sea level, by allowing the user to adjust a correction factor 
>>> that is applied to the actual measured pressure until the reading matches 
>>> some local reference barometric pressure report.  This automatically also 
>>> corrects for any errors in the pressure sensor itself, a handy bonus. 
>>> There’s not reference in the manual to any other kind of pressure being 
>>> reported, so it only makes sense that what it transmits via the USB 
>>> interface is also this corrected pressure, i.e., “barometer.”  But the 
>>> WS28XX driver documentation, and as far as I can tell the code also, assume 
>>> that the pressure reading fro the hardware is what weewx calls “pressure,” 
>>> that is, the actual ambient pressure before correction for altitude.  As 
>>> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
>>> yours and actually send the corrected barometer reading. Maybe because the 
>>> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
>>> as raw pressure reading in the driver. 
>>>
>>> The bottom line is, I’m pretty sure the issue is that the driver is 
>>> wrong.  I’m not familiar enough with that part of the weewx code to offer a 
>>> fix, but it should be pretty simple for someone who is familiar with that 
>>> code.  
>>>
>>>   -Les
>>>
>>>
>>>
>>> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
>>>
>>> It is likely that I am mis-using the terms altimeter, barometer, and 
>>> pressure.  I'll clarify what I mean here.  
>>>
>>> What I previously defined as 'correct' pressure is that the pressure 
>>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
>>> Service barometer reading (
>>> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>>>  
>>> For example, *right now* my station is reading 30.06 pressure and the 
>>> NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
>>> pressure reading to match the WU pressure reading (
>>> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
>>> appears that WU is reading the weewx barometer reading.  Is there a way to 
>>> have weewx report the pressure reading to WU?
>>>
>>> My WS-2813 outputs the manually adjusted pressure in the Loop records 
>>> (see attachment).  I don't see a way to change that.  Here is a link to the 
>>> manual (
>>> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>>> ).
>>>
>>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:

 I would expect you to be reporting barometer = sea level pressure which 
 is pressure adjusted for temperature and altitude because weather stations 
 always report sea level pressures.

 Is what you call 'correct' pressure the raw pressure of the instrument 
 or a pressure which you have set.  Does the station output the raw 
 pressure 
 or the manually adjusted pressure in the loop records?



 On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>
> Andrew, that's a good questions; let me clarify.  
>
> This issue started when Weath

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Andrew, I've set barometer = hardware and altimeter = software and pressure 
= software.  I've restarted weewx, but nothing has changed in the Loop.

On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote:
>
> if indeed, and i now tend to agree, the station displays and outputs a 
> manually adjusted barometer which is set to a sea level reading from local 
> weather stations and not pressure then barometer should be set to hardware 
> and pressure and altimeter set to software, and not as i previously 
> suggested.
>
> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:
>>
>> OK… The “pressure” that your station is displaying is what it should be 
>> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
>> this is called “barometer” because that is what weather stations report for 
>> barometric pressure.  “Altimeter” is basically the same thing; there are 
>> differences in exactly how it is corrected, but those differences are minor 
>> and can be ignored for now.  The distinction between what weewx calls 
>> “barometer” and “pressure” is important, though, for anyone more than a few 
>> hundred feet above sea level.  
>>
>> From the manual, it appears that the WS-2813 uses a simple method for 
>> correcting to sea level, by allowing the user to adjust a correction factor 
>> that is applied to the actual measured pressure until the reading matches 
>> some local reference barometric pressure report.  This automatically also 
>> corrects for any errors in the pressure sensor itself, a handy bonus. 
>> There’s not reference in the manual to any other kind of pressure being 
>> reported, so it only makes sense that what it transmits via the USB 
>> interface is also this corrected pressure, i.e., “barometer.”  But the 
>> WS28XX driver documentation, and as far as I can tell the code also, assume 
>> that the pressure reading fro the hardware is what weewx calls “pressure,” 
>> that is, the actual ambient pressure before correction for altitude.  As 
>> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
>> yours and actually send the corrected barometer reading. Maybe because the 
>> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
>> as raw pressure reading in the driver. 
>>
>> The bottom line is, I’m pretty sure the issue is that the driver is 
>> wrong.  I’m not familiar enough with that part of the weewx code to offer a 
>> fix, but it should be pretty simple for someone who is familiar with that 
>> code.  
>>
>>   -Les
>>
>>
>>
>> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
>>
>> It is likely that I am mis-using the terms altimeter, barometer, and 
>> pressure.  I'll clarify what I mean here.  
>>
>> What I previously defined as 'correct' pressure is that the pressure 
>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
>> Service barometer reading (
>> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>>  
>> For example, *right now* my station is reading 30.06 pressure and the 
>> NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
>> pressure reading to match the WU pressure reading (
>> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
>> appears that WU is reading the weewx barometer reading.  Is there a way to 
>> have weewx report the pressure reading to WU?
>>
>> My WS-2813 outputs the manually adjusted pressure in the Loop records 
>> (see attachment).  I don't see a way to change that.  Here is a link to the 
>> manual (
>> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>> ).
>>
>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>>>
>>> I would expect you to be reporting barometer = sea level pressure which 
>>> is pressure adjusted for temperature and altitude because weather stations 
>>> always report sea level pressures.
>>>
>>> Is what you call 'correct' pressure the raw pressure of the instrument 
>>> or a pressure which you have set.  Does the station output the raw pressure 
>>> or the manually adjusted pressure in the loop records?
>>>
>>>
>>>
>>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:

 Andrew, that's a good questions; let me clarify.  

 This issue started when Weather Underground (WU) stopped showing my 
 station on the maps. I found out that was because I was reporting an 
 incorrect barometric 'pressure.'  As I dug into the details I found that 
 my *station 
 *was displaying the correct pressure (29.xx) but by the time it got to 
 WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
 also be demonstrated by looking at the data displayed at 
 /var/www/html/weewx/index.html 
 (see attachment) so I assume that weewx is taking the pressure from my 
 station and somehow converting it or exchanging it for baro

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Thomas Keffer]

This is Matthew's baby. Matthew?

-tk

On Fri, Feb 14, 2020 at 10:11 PM gjr80  wrote:

> As this thread has drawn on I agree the solution is in the driver. I found
> it had to believe that a driver could have been around for so long with an
> incorrect 'pressure' being used and the issue never having come up before.
> Sure enough, this thread
> 
> from 2016 bears a remarkable similarity to the issue here. It also seems
> that Tom acknowledged that the WS2813 actually outputs altimeter not
> pressure as coded in the driver. Later in the thread there are suggested
> changes to the driver but it gets a bit murky around some corrections that
> are being applied within StdCaibrate. Seems no changes were ever made to
> the driver though. Might be worthwhile for Tom or Matthew to revisit this.
>
> Gary
>
> On Saturday, 15 February 2020 14:22:07 UTC+10, ln77 wrote:
>>
>> OK… The “pressure” that your station is displaying is what it should be
>> displaying: the ambient air pressure, correct for your altitude.  In weewx,
>> this is called “barometer” because that is what weather stations report for
>> barometric pressure.  “Altimeter” is basically the same thing; there are
>> differences in exactly how it is corrected, but those differences are minor
>> and can be ignored for now.  The distinction between what weewx calls
>> “barometer” and “pressure” is important, though, for anyone more than a few
>> hundred feet above sea level.
>>
>> From the manual, it appears that the WS-2813 uses a simple method for
>> correcting to sea level, by allowing the user to adjust a correction factor
>> that is applied to the actual measured pressure until the reading matches
>> some local reference barometric pressure report.  This automatically also
>> corrects for any errors in the pressure sensor itself, a handy bonus.
>> There’s not reference in the manual to any other kind of pressure being
>> reported, so it only makes sense that what it transmits via the USB
>> interface is also this corrected pressure, i.e., “barometer.”  But the
>> WS28XX driver documentation, and as far as I can tell the code also, assume
>> that the pressure reading fro the hardware is what weewx calls “pressure,”
>> that is, the actual ambient pressure before correction for altitude.  As
>> far as I can tell, all of the WS28XX LaCrosse stations work the same way as
>> yours and actually send the corrected barometer reading. Maybe because the
>> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted
>> as raw pressure reading in the driver.
>>
>> The bottom line is, I’m pretty sure the issue is that the driver is
>> wrong.  I’m not familiar enough with that part of the weewx code to offer a
>> fix, but it should be pretty simple for someone who is familiar with that
>> code.
>>
>>   -Les
>>
>>
>>
>> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
>>
>> It is likely that I am mis-using the terms altimeter, barometer, and
>> pressure.  I'll clarify what I mean here.
>>
>> What I previously defined as 'correct' pressure is that the pressure
>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather
>> Service barometer reading (
>> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>> For example, *right now* my station is reading 30.06 pressure and the
>> NWS site is reporting 30.0 barometer.  Ultimately I just want my WS-2813
>> pressure reading to match the WU pressure reading (
>> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it
>> appears that WU is reading the weewx barometer reading.  Is there a way to
>> have weewx report the pressure reading to WU?
>>
>> My WS-2813 outputs the manually adjusted pressure in the Loop records
>> (see attachment).  I don't see a way to change that.  Here is a link to the
>> manual (
>> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
>> ).
>>
>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>>>
>>> I would expect you to be reporting barometer = sea level pressure which
>>> is pressure adjusted for temperature and altitude because weather stations
>>> always report sea level pressures.
>>>
>>> Is what you call 'correct' pressure the raw pressure of the instrument
>>> or a pressure which you have set.  Does the station output the raw pressure
>>> or the manually adjusted pressure in the loop records?
>>>
>>>
>>>
>>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:

 Andrew, that's a good questions; let me clarify.

 This issue started when Weather Underground (WU) stopped showing my
 station on the maps. I found out that was because I was reporting an
 incorrect barometric 'pressure.'  As I dug into the details I found that 
 my *station
 *was displaying the correct pressure (29.xx) but by the time it got to
 WU, it was displaying the barom

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

As this thread has drawn on I agree the solution is in the driver. I found 
it had to believe that a driver could have been around for so long with an 
incorrect 'pressure' being used and the issue never having come up before. 
Sure enough, this thread 
 from 
2016 bears a remarkable similarity to the issue here. It also seems that 
Tom acknowledged that the WS2813 actually outputs altimeter not pressure as 
coded in the driver. Later in the thread there are suggested changes to the 
driver but it gets a bit murky around some corrections that are being 
applied within StdCaibrate. Seems no changes were ever made to the driver 
though. Might be worthwhile for Tom or Matthew to revisit this.

Gary

On Saturday, 15 February 2020 14:22:07 UTC+10, ln77 wrote:
>
> OK… The “pressure” that your station is displaying is what it should be 
> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
> this is called “barometer” because that is what weather stations report for 
> barometric pressure.  “Altimeter” is basically the same thing; there are 
> differences in exactly how it is corrected, but those differences are minor 
> and can be ignored for now.  The distinction between what weewx calls 
> “barometer” and “pressure” is important, though, for anyone more than a few 
> hundred feet above sea level.  
>
> From the manual, it appears that the WS-2813 uses a simple method for 
> correcting to sea level, by allowing the user to adjust a correction factor 
> that is applied to the actual measured pressure until the reading matches 
> some local reference barometric pressure report.  This automatically also 
> corrects for any errors in the pressure sensor itself, a handy bonus. 
> There’s not reference in the manual to any other kind of pressure being 
> reported, so it only makes sense that what it transmits via the USB 
> interface is also this corrected pressure, i.e., “barometer.”  But the 
> WS28XX driver documentation, and as far as I can tell the code also, assume 
> that the pressure reading fro the hardware is what weewx calls “pressure,” 
> that is, the actual ambient pressure before correction for altitude.  As 
> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
> yours and actually send the corrected barometer reading. Maybe because the 
> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
> as raw pressure reading in the driver. 
>
> The bottom line is, I’m pretty sure the issue is that the driver is wrong. 
>  I’m not familiar enough with that part of the weewx code to offer a fix, 
> but it should be pretty simple for someone who is familiar with that code.  
>
>   -Les
>
>
>
> On 14 Feb 2020, at 19:44, Dan Blanchard > 
> wrote:
>
> It is likely that I am mis-using the terms altimeter, barometer, and 
> pressure.  I'll clarify what I mean here.  
>
> What I previously defined as 'correct' pressure is that the pressure 
> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
> Service barometer reading (
> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>  
> For example, *right now* my station is reading 30.06 pressure and the NWS 
> site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
> pressure reading to match the WU pressure reading (
> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
> appears that WU is reading the weewx barometer reading.  Is there a way to 
> have weewx report the pressure reading to WU?
>
> My WS-2813 outputs the manually adjusted pressure in the Loop records (see 
> attachment).  I don't see a way to change that.  Here is a link to the 
> manual (
> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
> ).
>
> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>>
>> I would expect you to be reporting barometer = sea level pressure which 
>> is pressure adjusted for temperature and altitude because weather stations 
>> always report sea level pressures.
>>
>> Is what you call 'correct' pressure the raw pressure of the instrument or 
>> a pressure which you have set.  Does the station output the raw pressure or 
>> the manually adjusted pressure in the loop records?
>>
>>
>>
>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, that's a good questions; let me clarify.  
>>>
>>> This issue started when Weather Underground (WU) stopped showing my 
>>> station on the maps. I found out that was because I was reporting an 
>>> incorrect barometric 'pressure.'  As I dug into the details I found that my 
>>> *station 
>>> *was displaying the correct pressure (29.xx) but by the time it got to 
>>> WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
>>> also be demonstrated by looking at the data displayed at 
>>> /var/www/html/weewx

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

if indeed, and i now tend to agree, the station displays and outputs a 
manually adjusted barometer which is set to a sea level reading from local 
weather stations and not pressure then barometer should be set to hardware 
and pressure and altimeter set to software, and not as i previously 
suggested.

On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote:
>
> OK… The “pressure” that your station is displaying is what it should be 
> displaying: the ambient air pressure, correct for your altitude.  In weewx, 
> this is called “barometer” because that is what weather stations report for 
> barometric pressure.  “Altimeter” is basically the same thing; there are 
> differences in exactly how it is corrected, but those differences are minor 
> and can be ignored for now.  The distinction between what weewx calls 
> “barometer” and “pressure” is important, though, for anyone more than a few 
> hundred feet above sea level.  
>
> From the manual, it appears that the WS-2813 uses a simple method for 
> correcting to sea level, by allowing the user to adjust a correction factor 
> that is applied to the actual measured pressure until the reading matches 
> some local reference barometric pressure report.  This automatically also 
> corrects for any errors in the pressure sensor itself, a handy bonus. 
> There’s not reference in the manual to any other kind of pressure being 
> reported, so it only makes sense that what it transmits via the USB 
> interface is also this corrected pressure, i.e., “barometer.”  But the 
> WS28XX driver documentation, and as far as I can tell the code also, assume 
> that the pressure reading fro the hardware is what weewx calls “pressure,” 
> that is, the actual ambient pressure before correction for altitude.  As 
> far as I can tell, all of the WS28XX LaCrosse stations work the same way as 
> yours and actually send the corrected barometer reading. Maybe because the 
> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted 
> as raw pressure reading in the driver. 
>
> The bottom line is, I’m pretty sure the issue is that the driver is wrong. 
>  I’m not familiar enough with that part of the weewx code to offer a fix, 
> but it should be pretty simple for someone who is familiar with that code.  
>
>   -Les
>
>
>
> On 14 Feb 2020, at 19:44, Dan Blanchard > 
> wrote:
>
> It is likely that I am mis-using the terms altimeter, barometer, and 
> pressure.  I'll clarify what I mean here.  
>
> What I previously defined as 'correct' pressure is that the pressure 
> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
> Service barometer reading (
> https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
>  
> For example, *right now* my station is reading 30.06 pressure and the NWS 
> site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
> pressure reading to match the WU pressure reading (
> https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
> appears that WU is reading the weewx barometer reading.  Is there a way to 
> have weewx report the pressure reading to WU?
>
> My WS-2813 outputs the manually adjusted pressure in the Loop records (see 
> attachment).  I don't see a way to change that.  Here is a link to the 
> manual (
> https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
> ).
>
> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>>
>> I would expect you to be reporting barometer = sea level pressure which 
>> is pressure adjusted for temperature and altitude because weather stations 
>> always report sea level pressures.
>>
>> Is what you call 'correct' pressure the raw pressure of the instrument or 
>> a pressure which you have set.  Does the station output the raw pressure or 
>> the manually adjusted pressure in the loop records?
>>
>>
>>
>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, that's a good questions; let me clarify.  
>>>
>>> This issue started when Weather Underground (WU) stopped showing my 
>>> station on the maps. I found out that was because I was reporting an 
>>> incorrect barometric 'pressure.'  As I dug into the details I found that my 
>>> *station 
>>> *was displaying the correct pressure (29.xx) but by the time it got to 
>>> WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
>>> also be demonstrated by looking at the data displayed at 
>>> /var/www/html/weewx/index.html 
>>> (see attachment) so I assume that weewx is taking the pressure from my 
>>> station and somehow converting it or exchanging it for barometric pressure 
>>> before it gets uploaded to WU.  I just want the pressure from my unit to be 
>>> what is reported to WU.
>>>
>>> Side note: I've been running this station for many years on a Windows 
>>> based system and it has been working fine.  So I know the hardware side is 
>>> working; just something differ

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

OK… The “pressure” that your station is displaying is what it should be 
displaying: the ambient air pressure, correct for your altitude.  In weewx, 
this is called “barometer” because that is what weather stations report for 
barometric pressure.  “Altimeter” is basically the same thing; there are 
differences in exactly how it is corrected, but those differences are minor and 
can be ignored for now.  The distinction between what weewx calls “barometer” 
and “pressure” is important, though, for anyone more than a few hundred feet 
above sea level.  

>From the manual, it appears that the WS-2813 uses a simple method for 
>correcting to sea level, by allowing the user to adjust a correction factor 
>that is applied to the actual measured pressure until the reading matches some 
>local reference barometric pressure report.  This automatically also corrects 
>for any errors in the pressure sensor itself, a handy bonus. There’s not 
>reference in the manual to any other kind of pressure being reported, so it 
>only makes sense that what it transmits via the USB interface is also this 
>corrected pressure, i.e., “barometer.”  But the WS28XX driver documentation, 
>and as far as I can tell the code also, assume that the pressure reading fro 
>the hardware is what weewx calls “pressure,” that is, the actual ambient 
>pressure before correction for altitude.  As far as I can tell, all of the 
>WS28XX LaCrosse stations work the same way as yours and actually send the 
>corrected barometer reading. Maybe because the LaCrosse documentation calls it 
>“pressure,” it was mistakenly interpreted as raw pressure reading in the 
>driver. 

The bottom line is, I’m pretty sure the issue is that the driver is wrong.  I’m 
not familiar enough with that part of the weewx code to offer a fix, but it 
should be pretty simple for someone who is familiar with that code.  

  -Les



> On 14 Feb 2020, at 19:44, Dan Blanchard  wrote:
> 
> It is likely that I am mis-using the terms altimeter, barometer, and 
> pressure.  I'll clarify what I mean here.  
> 
> What I previously defined as 'correct' pressure is that the pressure reported 
> by my station (LaCrosse WS-2813U-IT) matches the National Weather Service 
> barometer reading 
> (https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk
>  
> ).
>  For example, right now my station is reading 30.06 pressure and the NWS site 
> is reporting 30.0 barometer.  Ultimately I just want my WS-2813 pressure 
> reading to match the WU pressure reading 
> (https://www.wunderground.com/dashboard/pws/KIDPOSTF43 
> ).  Right now it 
> appears that WU is reading the weewx barometer reading.  Is there a way to 
> have weewx report the pressure reading to WU?
> 
> My WS-2813 outputs the manually adjusted pressure in the Loop records (see 
> attachment).  I don't see a way to change that.  Here is a link to the manual 
> (https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf 
> ).
> 
> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
> I would expect you to be reporting barometer = sea level pressure which is 
> pressure adjusted for temperature and altitude because weather stations 
> always report sea level pressures.
> 
> Is what you call 'correct' pressure the raw pressure of the instrument or a 
> pressure which you have set.  Does the station output the raw pressure or the 
> manually adjusted pressure in the loop records?
> 
> 
> 
> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
> Andrew, that's a good questions; let me clarify.  
> 
> This issue started when Weather Underground (WU) stopped showing my station 
> on the maps. I found out that was because I was reporting an incorrect 
> barometric 'pressure.'  As I dug into the details I found that my station was 
> displaying the correct pressure (29.xx) but by the time it got to WU, it was 
> displaying the barometer reading (32.xx) from weewx.  This can also be 
> demonstrated by looking at the data displayed at 
> /var/www/html/weewx/index.html (see attachment) so I assume that weewx is 
> taking the pressure from my station and somehow converting it or exchanging 
> it for barometric pressure before it gets uploaded to WU.  I just want the 
> pressure from my unit to be what is reported to WU.
> 
> Side note: I've been running this station for many years on a Windows based 
> system and it has been working fine.  So I know the hardware side is working; 
> just something different about how weewx reports pressure (or barometer, or 
> altimiter).
> 
> Does that help clarify my issue?
> 
> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote:
> I am  not sure I understand what you thi

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

It is likely that I am mis-using the terms altimeter, barometer, and 
pressure.  I'll clarify what I mean here.  

What I previously defined as 'correct' pressure is that the pressure 
reported by my station (LaCrosse WS-2813U-IT) matches the National Weather 
Service barometer reading (
https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
 
For example, *right now* my station is reading 30.06 pressure and the NWS 
site is reporting 30.0 barometer.  Ultimately I just want my WS-2813 
pressure reading to match the WU pressure reading (
https://www.wunderground.com/dashboard/pws/KIDPOSTF43).  Right now it 
appears that WU is reading the weewx barometer reading.  Is there a way to 
have weewx report the pressure reading to WU?

My WS-2813 outputs the manually adjusted pressure in the Loop records (see 
attachment).  I don't see a way to change that.  Here is a link to the 
manual (
https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf
).

On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>
> I would expect you to be reporting barometer = sea level pressure which is 
> pressure adjusted for temperature and altitude because weather stations 
> always report sea level pressures.
>
> Is what you call 'correct' pressure the raw pressure of the instrument or 
> a pressure which you have set.  Does the station output the raw pressure or 
> the manually adjusted pressure in the loop records?
>
>
>
> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, that's a good questions; let me clarify.  
>>
>> This issue started when Weather Underground (WU) stopped showing my 
>> station on the maps. I found out that was because I was reporting an 
>> incorrect barometric 'pressure.'  As I dug into the details I found that my 
>> *station 
>> *was displaying the correct pressure (29.xx) but by the time it got to 
>> WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
>> also be demonstrated by looking at the data displayed at 
>> /var/www/html/weewx/index.html 
>> (see attachment) so I assume that weewx is taking the pressure from my 
>> station and somehow converting it or exchanging it for barometric pressure 
>> before it gets uploaded to WU.  I just want the pressure from my unit to be 
>> what is reported to WU.
>>
>> Side note: I've been running this station for many years on a Windows 
>> based system and it has been working fine.  So I know the hardware side is 
>> working; just something different about how weewx reports pressure (or 
>> barometer, or altimiter).
>>
>> Does that help clarify my issue?
>>
>> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote:
>>>
>>> I am  not sure I understand what you think is wrong with the readings of
>>> Pressure 29.89
>>> Barometer 32.609
>>> Altimeter 32.40
>>> and why you believe something is wrong
>>>
>>>
>>> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote:

 Altitude is 2,320 ft. and the values are in the screen shot on the 
 previous post.  Did you see that?

 On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:
>
> I give up - looks correct to me.
>
> have you run from the command line and seen the LOOP and REC data 
> weewx is receiving?
>
> what altitude is your station, and what values are you currently 
> getting for pressure, barometer and altimeter?  
>
> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>>
>> I don't know, but that makes sense so I did it.  I'm still not 
>> getting desired results though.
>>
>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>>>
>>> Do you need a space between your minus sign and the adjustment 
>>> value? 
>>>
>>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
>>> wrote:
>>>
 Hey Andrew, will you please look at the attached screen shots and 
 let me know if this looks correct?

 Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
 these changes?  I have and the changes don't seem to be taking effect. 
  Is 
 there something else I need to do?

 With regard to the barometer and altimeter having the same 
 settings; I have probably misled.  They are not exactly the same but 
 they 
 were relatively close to each other compared to the pressure value.  
 Here 
 are the current readings as of now when I run sudo weewxd 
 /etc/weewx/weewx.conf.

 pressure: 29.98
 altimeter: 32.57
 barometer: 32.74



 On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
 wrote:
>
> If you have a LaCrosse WS28xx station then according to the 
> hardware guide the station 

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

What I am defining as 'correct' pressure is the barometer value that 
matches the local reading from the National Weather Service (NWS) for my 
area.  In other words, the pressure on my weather station (LaCrosse 
WS-2813U-IT) matches what the NWS is reporting as Barometer (
https://forecast.weather.gov/MapClick.php?lat=47.7151345&lon=-116.946676#.XkdkXDFKiUk).
 
It is possible that I am mis-using the terms barometer, altimeter, and 
pressure.

Ultimately, I just want the value reported by my WS-2813 to be reported to 
WU.

If I understand your question correctly, my station outputs the manually 
adjusted pressure in the loop records. For example, my station is reporting 
30.06 and the Loop record is reporting 30.05857 *right now* (see 
attachment).

On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote:
>
> I would expect you to be reporting barometer = sea level pressure which is 
> pressure adjusted for temperature and altitude because weather stations 
> always report sea level pressures.
>
> Is what you call 'correct' pressure the raw pressure of the instrument or 
> a pressure which you have set.  Does the station output the raw pressure or 
> the manually adjusted pressure in the loop records?
>
>
>
> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, that's a good questions; let me clarify.  
>>
>> This issue started when Weather Underground (WU) stopped showing my 
>> station on the maps. I found out that was because I was reporting an 
>> incorrect barometric 'pressure.'  As I dug into the details I found that my 
>> *station 
>> *was displaying the correct pressure (29.xx) but by the time it got to 
>> WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
>> also be demonstrated by looking at the data displayed at 
>> /var/www/html/weewx/index.html 
>> (see attachment) so I assume that weewx is taking the pressure from my 
>> station and somehow converting it or exchanging it for barometric pressure 
>> before it gets uploaded to WU.  I just want the pressure from my unit to be 
>> what is reported to WU.
>>
>> Side note: I've been running this station for many years on a Windows 
>> based system and it has been working fine.  So I know the hardware side is 
>> working; just something different about how weewx reports pressure (or 
>> barometer, or altimiter).
>>
>> Does that help clarify my issue?
>>
>> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote:
>>>
>>> I am  not sure I understand what you think is wrong with the readings of
>>> Pressure 29.89
>>> Barometer 32.609
>>> Altimeter 32.40
>>> and why you believe something is wrong
>>>
>>>
>>> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote:

 Altitude is 2,320 ft. and the values are in the screen shot on the 
 previous post.  Did you see that?

 On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:
>
> I give up - looks correct to me.
>
> have you run from the command line and seen the LOOP and REC data 
> weewx is receiving?
>
> what altitude is your station, and what values are you currently 
> getting for pressure, barometer and altimeter?  
>
> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>>
>> I don't know, but that makes sense so I did it.  I'm still not 
>> getting desired results though.
>>
>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>>>
>>> Do you need a space between your minus sign and the adjustment 
>>> value? 
>>>
>>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
>>> wrote:
>>>
 Hey Andrew, will you please look at the attached screen shots and 
 let me know if this looks correct?

 Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
 these changes?  I have and the changes don't seem to be taking effect. 
  Is 
 there something else I need to do?

 With regard to the barometer and altimeter having the same 
 settings; I have probably misled.  They are not exactly the same but 
 they 
 were relatively close to each other compared to the pressure value.  
 Here 
 are the current readings as of now when I run sudo weewxd 
 /etc/weewx/weewx.conf.

 pressure: 29.98
 altimeter: 32.57
 barometer: 32.74



 On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
 wrote:
>
> If you have a LaCrosse WS28xx station then according to the 
> hardware guide the station outputs PRESSURE in weewx terminology - 
> regardless of what LaCrosse call it - and weewx should calculate 
> barometer 
> and altimeter settings.
>
> If pressure is incorrect then it can be adjusted as you 

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

I would expet you to be reporting barometer = sea level pressure which is 
pressure adjusted for temperature and altitudebecause weather stations 
always report sea level pressures.

Is what you call 'correct' pressure the raw pressure of the instrument or a 
pressure which you have set.  Does the station output the raw pressure or 
the manually adjusted pressure in the loop records?



On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote:
>
> Andrew, that's a good questions; let me clarify.  
>
> This issue started when Weather Underground (WU) stopped showing my 
> station on the maps. I found out that was because I was reporting an 
> incorrect barometric 'pressure.'  As I dug into the details I found that my 
> *station 
> *was displaying the correct pressure (29.xx) but by the time it got to 
> WU, it was displaying the barometer reading (32.xx) from weewx.  This can 
> also be demonstrated by looking at the data displayed at 
> /var/www/html/weewx/index.html 
> (see attachment) so I assume that weewx is taking the pressure from my 
> station and somehow converting it or exchanging it for barometric pressure 
> before it gets uploaded to WU.  I just want the pressure from my unit to be 
> what is reported to WU.
>
> Side note: I've been running this station for many years on a Windows 
> based system and it has been working fine.  So I know the hardware side is 
> working; just something different about how weewx reports pressure (or 
> barometer, or altimiter).
>
> Does that help clarify my issue?
>
> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote:
>>
>> I am  not sure I understand what you think is wrong with the readings of
>> Pressure 29.89
>> Barometer 32.609
>> Altimeter 32.40
>> and why you believe something is wrong
>>
>>
>> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote:
>>>
>>> Altitude is 2,320 ft. and the values are in the screen shot on the 
>>> previous post.  Did you see that?
>>>
>>> On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:

 I give up - looks correct to me.

 have you run from the command line and seen the LOOP and REC data weewx 
 is receiving?

 what altitude is your station, and what values are you currently 
 getting for pressure, barometer and altimeter?  

 On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>
> I don't know, but that makes sense so I did it.  I'm still not getting 
> desired results though.
>
> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>>
>> Do you need a space between your minus sign and the adjustment value? 
>>
>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
>> wrote:
>>
>>> Hey Andrew, will you please look at the attached screen shots and 
>>> let me know if this looks correct?
>>>
>>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
>>> these changes?  I have and the changes don't seem to be taking effect.  
>>> Is 
>>> there something else I need to do?
>>>
>>> With regard to the barometer and altimeter having the same settings; 
>>> I have probably misled.  They are not exactly the same but they were 
>>> relatively close to each other compared to the pressure value.  Here 
>>> are 
>>> the current readings as of now when I run sudo weewxd 
>>> /etc/weewx/weewx.conf.
>>>
>>> pressure: 29.98
>>> altimeter: 32.57
>>> barometer: 32.74
>>>
>>>
>>>
>>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
>>> wrote:

 If you have a LaCrosse WS28xx station then according to the 
 hardware guide the station outputs PRESSURE in weewx terminology - 
 regardless of what LaCrosse call it - and weewx should calculate 
 barometer 
 and altimeter settings.

 If pressure is incorrect then it can be adjusted as you specified - 
 by adjusting pressure (not barometer or altimeter)

 Make sure pressure is set to use hardware and barometer and 
 altimeter are set to use software.

 I am surprised barometer and altimeter are the same values - have 
 you set the station's altitude in weewx.conf, and have you specified 
 software generation for the values?



 On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>
> Andrew, are you suggesting that I make a 'correction' entry under 
> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
> getting a pressure reading of 30.13  and Barometer and ALtitude 
> readings of 
> 32.93?
>
> (see attached screenshot)
>
> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
> wrote:
>>
>> 1. use stdcali

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Andrew, that's a good questions; let me clarify.  

This issue started when Weather Underground (WU) stopped showing my station 
on the maps. I found out that was because I was reporting an incorrect 
barometric 'pressure.'  As I dug into the details I found that my *station *was 
displaying the correct pressure (29.xx) but by the time it got to WU, it 
was displaying the barometer reading (32.xx) from weewx.  This can also be 
demonstrated by looking at the data displayed at /var/www/html/weewx/index.html 
(see attachment) so I assume that weewx is taking the pressure from my 
station and somehow converting it or exchanging it for barometric pressure 
before it gets uploaded to WU.  I just want the pressure from my unit to be 
what is reported to WU.

Side note: I've been running this station for many years on a Windows based 
system and it has been working fine.  So I know the hardware side is 
working; just something different about how weewx reports pressure (or 
barometer, or altimiter).

Does that help clarify my issue?

On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote:
>
> I am  not sure I understand what you think is wrong with the readings of
> Pressure 29.89
> Barometer 32.609
> Altimeter 32.40
> and why you believe something is wrong
>
>
> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote:
>>
>> Altitude is 2,320 ft. and the values are in the screen shot on the 
>> previous post.  Did you see that?
>>
>> On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:
>>>
>>> I give up - looks correct to me.
>>>
>>> have you run from the command line and seen the LOOP and REC data weewx 
>>> is receiving?
>>>
>>> what altitude is your station, and what values are you currently getting 
>>> for pressure, barometer and altimeter?  
>>>
>>> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:

 I don't know, but that makes sense so I did it.  I'm still not getting 
 desired results though.

 On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>
> Do you need a space between your minus sign and the adjustment value? 
>
> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
> wrote:
>
>> Hey Andrew, will you please look at the attached screen shots and let 
>> me know if this looks correct?
>>
>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
>> these changes?  I have and the changes don't seem to be taking effect.  
>> Is 
>> there something else I need to do?
>>
>> With regard to the barometer and altimeter having the same settings; 
>> I have probably misled.  They are not exactly the same but they were 
>> relatively close to each other compared to the pressure value.  Here are 
>> the current readings as of now when I run sudo weewxd 
>> /etc/weewx/weewx.conf.
>>
>> pressure: 29.98
>> altimeter: 32.57
>> barometer: 32.74
>>
>>
>>
>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
>> wrote:
>>>
>>> If you have a LaCrosse WS28xx station then according to the hardware 
>>> guide the station outputs PRESSURE in weewx terminology - regardless of 
>>> what LaCrosse call it - and weewx should calculate barometer and 
>>> altimeter 
>>> settings.
>>>
>>> If pressure is incorrect then it can be adjusted as you specified - 
>>> by adjusting pressure (not barometer or altimeter)
>>>
>>> Make sure pressure is set to use hardware and barometer and 
>>> altimeter are set to use software.
>>>
>>> I am surprised barometer and altimeter are the same values - have 
>>> you set the station's altitude in weewx.conf, and have you specified 
>>> software generation for the values?
>>>
>>>
>>>
>>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:

 Andrew, are you suggesting that I make a 'correction' entry under 
 [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
 getting a pressure reading of 30.13  and Barometer and ALtitude 
 readings of 
 32.93?

 (see attached screenshot)

 On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
 wrote:
>
> 1. use stdcalibrate section of weewx.conf
> http://weewx.com/docs/usersguide.htm#StdCalibrate
> 2. FO station = Fine Offset weather station
>
>
>
> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, how do I calibrate the pressure in weewx? Also, what's a 
>> FO station?
>>
>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner 
>> wrote:
>>>
>>> check that the absolute pressure is correct - I have had a FO 
>>> station which had a dodgy pressure

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

I am  not sure I understand what you think is wrong with the readings of
Pressure 29.89
Barometer 32.609
Altimeter 32.40
and why you believe something is wrong


On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote:
>
> Altitude is 2,320 ft. and the values are in the screen shot on the 
> previous post.  Did you see that?
>
> On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:
>>
>> I give up - looks correct to me.
>>
>> have you run from the command line and seen the LOOP and REC data weewx 
>> is receiving?
>>
>> what altitude is your station, and what values are you currently getting 
>> for pressure, barometer and altimeter?  
>>
>> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>>>
>>> I don't know, but that makes sense so I did it.  I'm still not getting 
>>> desired results though.
>>>
>>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:

 Do you need a space between your minus sign and the adjustment value? 

 On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
 wrote:

> Hey Andrew, will you please look at the attached screen shots and let 
> me know if this looks correct?
>
> Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
> these changes?  I have and the changes don't seem to be taking effect.  
> Is 
> there something else I need to do?
>
> With regard to the barometer and altimeter having the same settings; I 
> have probably misled.  They are not exactly the same but they were 
> relatively close to each other compared to the pressure value.  Here are 
> the current readings as of now when I run sudo weewxd 
> /etc/weewx/weewx.conf.
>
> pressure: 29.98
> altimeter: 32.57
> barometer: 32.74
>
>
>
> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
> wrote:
>>
>> If you have a LaCrosse WS28xx station then according to the hardware 
>> guide the station outputs PRESSURE in weewx terminology - regardless of 
>> what LaCrosse call it - and weewx should calculate barometer and 
>> altimeter 
>> settings.
>>
>> If pressure is incorrect then it can be adjusted as you specified - 
>> by adjusting pressure (not barometer or altimeter)
>>
>> Make sure pressure is set to use hardware and barometer and altimeter 
>> are set to use software.
>>
>> I am surprised barometer and altimeter are the same values - have you 
>> set the station's altitude in weewx.conf, and have you specified 
>> software 
>> generation for the values?
>>
>>
>>
>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, are you suggesting that I make a 'correction' entry under 
>>> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
>>> getting a pressure reading of 30.13  and Barometer and ALtitude 
>>> readings of 
>>> 32.93?
>>>
>>> (see attached screenshot)
>>>
>>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
>>> wrote:

 1. use stdcalibrate section of weewx.conf
 http://weewx.com/docs/usersguide.htm#StdCalibrate
 2. FO station = Fine Offset weather station



 On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>
> Andrew, how do I calibrate the pressure in weewx? Also, what's a 
> FO station?
>
> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner 
> wrote:
>>
>> check that the absolute pressure is correct - I have had a FO 
>> station which had a dodgy pressure sensor before now.  Calibrating 
>> pressure 
>> in weewx solved it.
>>
> -- 
> You received this message because you are subscribed to the Google 
> Groups "weewx-user" group.
> To unsubscribe from this group and stop receiving emails from it, send 
> an email to weewx...@googlegroups.com.
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com
>  
> 
> .
>


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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Altitude is 2,320 ft. and the values are in the screen shot on the previous 
post.  Did you see that?

On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote:
>
> I give up - looks correct to me.
>
> have you run from the command line and seen the LOOP and REC data weewx is 
> receiving?
>
> what altitude is your station, and what values are you currently getting 
> for pressure, barometer and altimeter?  
>
> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>>
>> I don't know, but that makes sense so I did it.  I'm still not getting 
>> desired results though.
>>
>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>>>
>>> Do you need a space between your minus sign and the adjustment value? 
>>>
>>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  
>>> wrote:
>>>
 Hey Andrew, will you please look at the attached screen shots and let 
 me know if this looks correct?

 Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
 these changes?  I have and the changes don't seem to be taking effect.  Is 
 there something else I need to do?

 With regard to the barometer and altimeter having the same settings; I 
 have probably misled.  They are not exactly the same but they were 
 relatively close to each other compared to the pressure value.  Here are 
 the current readings as of now when I run sudo weewxd 
 /etc/weewx/weewx.conf.

 pressure: 29.98
 altimeter: 32.57
 barometer: 32.74



 On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner 
 wrote:
>
> If you have a LaCrosse WS28xx station then according to the hardware 
> guide the station outputs PRESSURE in weewx terminology - regardless of 
> what LaCrosse call it - and weewx should calculate barometer and 
> altimeter 
> settings.
>
> If pressure is incorrect then it can be adjusted as you specified - by 
> adjusting pressure (not barometer or altimeter)
>
> Make sure pressure is set to use hardware and barometer and altimeter 
> are set to use software.
>
> I am surprised barometer and altimeter are the same values - have you 
> set the station's altitude in weewx.conf, and have you specified software 
> generation for the values?
>
>
>
> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, are you suggesting that I make a 'correction' entry under 
>> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
>> getting a pressure reading of 30.13  and Barometer and ALtitude readings 
>> of 
>> 32.93?
>>
>> (see attached screenshot)
>>
>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
>> wrote:
>>>
>>> 1. use stdcalibrate section of weewx.conf
>>> http://weewx.com/docs/usersguide.htm#StdCalibrate
>>> 2. FO station = Fine Offset weather station
>>>
>>>
>>>
>>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:

 Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
 station?

 On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner 
 wrote:
>
> check that the absolute pressure is correct - I have had a FO 
> station which had a dodgy pressure sensor before now.  Calibrating 
> pressure 
> in weewx solved it.
>
 -- 
 You received this message because you are subscribed to the Google 
 Groups "weewx-user" group.
 To unsubscribe from this group and stop receiving emails from it, send 
 an email to weewx...@googlegroups.com.
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 .

>>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

I give up - looks correct to me.

have you run from the command line and seen the LOOP and REC data weewx is 
receiving?

what altitude is your station, and what values are you currently getting 
for pressure, barometer and altimeter?  

On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote:
>
> I don't know, but that makes sense so I did it.  I'm still not getting 
> desired results though.
>
> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>>
>> Do you need a space between your minus sign and the adjustment value? 
>>
>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  wrote:
>>
>>> Hey Andrew, will you please look at the attached screen shots and let me 
>>> know if this looks correct?
>>>
>>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make 
>>> these changes?  I have and the changes don't seem to be taking effect.  Is 
>>> there something else I need to do?
>>>
>>> With regard to the barometer and altimeter having the same settings; I 
>>> have probably misled.  They are not exactly the same but they were 
>>> relatively close to each other compared to the pressure value.  Here are 
>>> the current readings as of now when I run sudo weewxd 
>>> /etc/weewx/weewx.conf.
>>>
>>> pressure: 29.98
>>> altimeter: 32.57
>>> barometer: 32.74
>>>
>>>
>>>
>>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner wrote:

 If you have a LaCrosse WS28xx station then according to the hardware 
 guide the station outputs PRESSURE in weewx terminology - regardless of 
 what LaCrosse call it - and weewx should calculate barometer and altimeter 
 settings.

 If pressure is incorrect then it can be adjusted as you specified - by 
 adjusting pressure (not barometer or altimeter)

 Make sure pressure is set to use hardware and barometer and altimeter 
 are set to use software.

 I am surprised barometer and altimeter are the same values - have you 
 set the station's altitude in weewx.conf, and have you specified software 
 generation for the values?



 On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>
> Andrew, are you suggesting that I make a 'correction' entry under 
> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
> getting a pressure reading of 30.13  and Barometer and ALtitude readings 
> of 
> 32.93?
>
> (see attached screenshot)
>
> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
> wrote:
>>
>> 1. use stdcalibrate section of weewx.conf
>> http://weewx.com/docs/usersguide.htm#StdCalibrate
>> 2. FO station = Fine Offset weather station
>>
>>
>>
>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
>>> station?
>>>
>>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner 
>>> wrote:

 check that the absolute pressure is correct - I have had a FO 
 station which had a dodgy pressure sensor before now.  Calibrating 
 pressure 
 in weewx solved it.

>>> -- 
>>> You received this message because you are subscribed to the Google 
>>> Groups "weewx-user" group.
>>> To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to weewx...@googlegroups.com.
>>> To view this discussion on the web visit 
>>> https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com
>>>  
>>> 
>>> .
>>>
>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

I don't know, but that makes sense so I did it.  I'm still not getting 
desired results though.

On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote:
>
> Do you need a space between your minus sign and the adjustment value? 
>
> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  > wrote:
>
>> Hey Andrew, will you please look at the attached screen shots and let me 
>> know if this looks correct?
>>
>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make these 
>> changes?  I have and the changes don't seem to be taking effect.  Is there 
>> something else I need to do?
>>
>> With regard to the barometer and altimeter having the same settings; I 
>> have probably misled.  They are not exactly the same but they were 
>> relatively close to each other compared to the pressure value.  Here are 
>> the current readings as of now when I run sudo weewxd 
>> /etc/weewx/weewx.conf.
>>
>> pressure: 29.98
>> altimeter: 32.57
>> barometer: 32.74
>>
>>
>>
>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner wrote:
>>>
>>> If you have a LaCrosse WS28xx station then according to the hardware 
>>> guide the station outputs PRESSURE in weewx terminology - regardless of 
>>> what LaCrosse call it - and weewx should calculate barometer and altimeter 
>>> settings.
>>>
>>> If pressure is incorrect then it can be adjusted as you specified - by 
>>> adjusting pressure (not barometer or altimeter)
>>>
>>> Make sure pressure is set to use hardware and barometer and altimeter 
>>> are set to use software.
>>>
>>> I am surprised barometer and altimeter are the same values - have you 
>>> set the station's altitude in weewx.conf, and have you specified software 
>>> generation for the values?
>>>
>>>
>>>
>>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:

 Andrew, are you suggesting that I make a 'correction' entry under 
 [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
 getting a pressure reading of 30.13  and Barometer and ALtitude readings 
 of 
 32.93?

 (see attached screenshot)

 On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner 
 wrote:
>
> 1. use stdcalibrate section of weewx.conf
> http://weewx.com/docs/usersguide.htm#StdCalibrate
> 2. FO station = Fine Offset weather station
>
>
>
> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
>> station?
>>
>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner 
>> wrote:
>>>
>>> check that the absolute pressure is correct - I have had a FO 
>>> station which had a dodgy pressure sensor before now.  Calibrating 
>>> pressure 
>>> in weewx solved it.
>>>
>> -- 
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>> "weewx-user" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to weewx...@googlegroups.com .
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>> https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com
>>  
>> 
>> .
>>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Kevin Davis]

Do you need a space between your minus sign and the adjustment value?

On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard  wrote:

> Hey Andrew, will you please look at the attached screen shots and let me
> know if this looks correct?
>
> Do I need to restart (sudo /etc/init.d/weewx restart) after I make these
> changes?  I have and the changes don't seem to be taking effect.  Is there
> something else I need to do?
>
> With regard to the barometer and altimeter having the same settings; I
> have probably misled.  They are not exactly the same but they were
> relatively close to each other compared to the pressure value.  Here are
> the current readings as of now when I run sudo weewxd
> /etc/weewx/weewx.conf.
>
> pressure: 29.98
> altimeter: 32.57
> barometer: 32.74
>
>
>
> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner wrote:
>>
>> If you have a LaCrosse WS28xx station then according to the hardware
>> guide the station outputs PRESSURE in weewx terminology - regardless of
>> what LaCrosse call it - and weewx should calculate barometer and altimeter
>> settings.
>>
>> If pressure is incorrect then it can be adjusted as you specified - by
>> adjusting pressure (not barometer or altimeter)
>>
>> Make sure pressure is set to use hardware and barometer and altimeter are
>> set to use software.
>>
>> I am surprised barometer and altimeter are the same values - have you set
>> the station's altitude in weewx.conf, and have you specified software
>> generation for the values?
>>
>>
>>
>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, are you suggesting that I make a 'correction' entry under
>>> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am
>>> getting a pressure reading of 30.13  and Barometer and ALtitude readings of
>>> 32.93?
>>>
>>> (see attached screenshot)
>>>
>>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner wrote:

 1. use stdcalibrate section of weewx.conf
 http://weewx.com/docs/usersguide.htm#StdCalibrate
 2. FO station = Fine Offset weather station



 On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>
> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO
> station?
>
> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:
>>
>> check that the absolute pressure is correct - I have had a FO station
>> which had a dodgy pressure sensor before now.  Calibrating pressure in
>> weewx solved it.
>>
> --
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> 
> .
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Hey Andrew, will you please look at the attached screen shots and let me 
know if this looks correct?

Do I need to restart (sudo /etc/init.d/weewx restart) after I make these 
changes?  I have and the changes don't seem to be taking effect.  Is there 
something else I need to do?

With regard to the barometer and altimeter having the same settings; I have 
probably misled.  They are not exactly the same but they were relatively 
close to each other compared to the pressure value.  Here are the current 
readings as of now when I run sudo weewxd /etc/weewx/weewx.conf.

pressure: 29.98
altimeter: 32.57
barometer: 32.74



On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner wrote:
>
> If you have a LaCrosse WS28xx station then according to the hardware guide 
> the station outputs PRESSURE in weewx terminology - regardless of what 
> LaCrosse call it - and weewx should calculate barometer and altimeter 
> settings.
>
> If pressure is incorrect then it can be adjusted as you specified - by 
> adjusting pressure (not barometer or altimeter)
>
> Make sure pressure is set to use hardware and barometer and altimeter are 
> set to use software.
>
> I am surprised barometer and altimeter are the same values - have you set 
> the station's altitude in weewx.conf, and have you specified software 
> generation for the values?
>
>
>
> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, are you suggesting that I make a 'correction' entry under 
>> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
>> getting a pressure reading of 30.13  and Barometer and ALtitude readings of 
>> 32.93?
>>
>> (see attached screenshot)
>>
>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner wrote:
>>>
>>> 1. use stdcalibrate section of weewx.conf
>>> http://weewx.com/docs/usersguide.htm#StdCalibrate
>>> 2. FO station = Fine Offset weather station
>>>
>>>
>>>
>>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:

 Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
 station?

 On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:
>
> check that the absolute pressure is correct - I have had a FO station 
> which had a dodgy pressure sensor before now.  Calibrating pressure in 
> weewx solved it.
>


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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

If you have a LaCrosse WS28xx station then according to the hardware guide 
the station outputs PRESSURE in weewx terminology - regardless of what 
LaCrosse call it - and weewx should calculate barometer and altimeter 
settings.

If pressure is incorrect then it can be adjusted as you specified - by 
adjusting pressure (not barometer or altimeter)

Make sure pressure is set to use hardware and barometer and altimeter are 
set to use software.

I am surprised barometer and altimeter are the same values - have you set 
the station's altitude in weewx.conf, and have you specified software 
generation for the values?



On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote:
>
> Andrew, are you suggesting that I make a 'correction' entry under 
> [StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
> getting a pressure reading of 30.13  and Barometer and ALtitude readings of 
> 32.93?
>
> (see attached screenshot)
>
> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner wrote:
>>
>> 1. use stdcalibrate section of weewx.conf
>> http://weewx.com/docs/usersguide.htm#StdCalibrate
>> 2. FO station = Fine Offset weather station
>>
>>
>>
>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>>>
>>> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
>>> station?
>>>
>>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:

 check that the absolute pressure is correct - I have had a FO station 
 which had a dodgy pressure sensor before now.  Calibrating pressure in 
 weewx solved it.

>>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Andrew, are you suggesting that I make a 'correction' entry under 
[StdCalibrate] such as barometer = barometer -2.8  assuming that I am 
getting a pressure reading of 30.13  and Barometer and ALtitude readings of 
32.93?

(see attached screenshot)

On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner wrote:
>
> 1. use stdcalibrate section of weewx.conf
> http://weewx.com/docs/usersguide.htm#StdCalibrate
> 2. FO station = Fine Offset weather station
>
>
>
> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>>
>> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
>> station?
>>
>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:
>>>
>>> check that the absolute pressure is correct - I have had a FO station 
>>> which had a dodgy pressure sensor before now.  Calibrating pressure in 
>>> weewx solved it.
>>>
>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

1. use stdcalibrate section of weewx.conf
http://weewx.com/docs/usersguide.htm#StdCalibrate
2. FO station = Fine Offset weather station



On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote:
>
> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO 
> station?
>
> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:
>>
>> check that the absolute pressure is correct - I have had a FO station 
>> which had a dodgy pressure sensor before now.  Calibrating pressure in 
>> weewx solved it.
>>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Andrew, how do I calibrate the pressure in weewx? Also, what's a FO station?

On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote:
>
> check that the absolute pressure is correct - I have had a FO station 
> which had a dodgy pressure sensor before now.  Calibrating pressure in 
> weewx solved it.
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Andrew Milner]

check that the absolute pressure is correct - I have had a FO station which 
had a dodgy pressure sensor before now.  Calibrating pressure in weewx 
solved it.

On Wednesday, 12 February 2020 03:51:29 UTC+2, gjr80 wrote:
>
> sudo /etc/init.d/weewx stop will stop the current running service but if 
> you have other instances running, for example WeeWX directly, sudo 
> /etc/init.d/weewx 
> stop will have no effect as WeeWX is not running as a service. When 
> running WeeWX directly you need to stop the execution using a control key 
> sequence (CTL-C) or list the running WeeWX processes with ps -aux|grep 
> weewx and then use the Linux kill command to kill the process.
>
> Whenever you do a lot of stop-starting, running services/running directly 
> and odd things (apart from odd pressure values :) ) are happening it can be 
> because there is more than one instance of WeeWX running. If you look at 
> the log you can usually see it by there being more than one process ID 
> number against WeeWX at any one time.
>
> Well if your relative pressure is set correctly I am out of ideas on how 
> to fix this. I am not convinced the driver is wrong but I guess it is 
> possible. Really need someone who understands the driver operation and the 
> 2813 to take that further.
>
> Gary
>
> On Wednesday, 12 February 2020 11:41:16 UTC+10, Dan Blanchard wrote:
>>
>> The further I go, the more complex it is getting.  First, yes I have a 
>> WS-2813U-IT and yes, I did set the relative pressure to match the local 
>> weather service.
>>
>> I don't want to muddy the waters any more, but how is it that I stopped 
>> the wewx service but it is still reporting?  I'm still trying to understand 
>> this thing.
>>
>> On Tuesday, February 11, 2020 at 5:04:02 PM UTC-8, gjr80 wrote:
>>>
>>> On Wednesday, 12 February 2020 10:16:47 UTC+10, Dan Blanchard wrote:

 OK, I shut down via sudo /etc/init.d/weewx stop then I ran sudo weewxd 
 /etc/weewx/weewx.conf and it is continuing to produce data.  I see 
 that the barometer and altimeter are both the 32.xx readings while 
 pressure 
 is the same as what is reading on my station 29.9x.

 Hang on, let's go through this a bit more carefully. So you have run 
>>> WeeWX directly and are seeing all three WeeWX pressure fields. WeeWX field 
>>> pressure is matching what is on your console exactly. Fields altitude 
>>> and barometer are 'in the 32s'. By my rough calculations an absolute 
>>> pressure of 29.9inHg at 2300ft gives a barometer value of about 32.5. So on 
>>> the face of it it would appear that the driver is providing data (whether 
>>> it is right or wrong) in field pressure and WeeWX is calculating fields 
>>> barometer and altimeter as expected.
>>>
>>> Can I ge weewx to read the pressure reading in lieu of the barometer 
 altimeter reading that it is presumably doing?

>>>
>>> Now I don't understand. The 28xx driver takes the pressure value 
>>> displayed on the station hardware and feeds that to WeeWX as the WeeWX 
>>> field named pressure (after which WeeWX calculates fields barometer and 
>>> altitude). Do you want the driver to instead take that pressure value 
>>> displayed on the station hardware and feed that to WeeWX as the WeeWX field 
>>> named barometer (after which WeeWX calculates fields pressure and 
>>> altitude)? That can be done but it requires modification of the driver 
>>> code, I would not being doing that lightly, someone did not roll a dice and 
>>> randomly decide to put the pressure value from the 2813 in field 
>>> pressure, it was done for a reason.
>>>
>>> I was looking for a 2813 manual and the only manual I could find was for 
>>> a WS-2813U-IT weather station. On page 14 it talks about setting a 
>>> 'Relative value pressure reference setting' based on a value from a weather 
>>> service, airport etc. Is that your station and have you set that correctly 
>>> or if not your station is there a similar setting?
>>>
>>> Gary
>>>
>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

sudo /etc/init.d/weewx stop will stop the current running service but if 
you have other instances running, for example WeeWX directly, sudo 
/etc/init.d/weewx 
stop will have no effect as WeeWX is not running as a service. When running 
WeeWX directly you need to stop the execution using a control key sequence 
(CTL-C) or list the running WeeWX processes with ps -aux|grep weewx and 
then use the Linux kill command to kill the process.

Whenever you do a lot of stop-starting, running services/running directly 
and odd things (apart from odd pressure values :) ) are happening it can be 
because there is more than one instance of WeeWX running. If you look at 
the log you can usually see it by there being more than one process ID 
number against WeeWX at any one time.

Well if your relative pressure is set correctly I am out of ideas on how to 
fix this. I am not convinced the driver is wrong but I guess it is 
possible. Really need someone who understands the driver operation and the 
2813 to take that further.

Gary

On Wednesday, 12 February 2020 11:41:16 UTC+10, Dan Blanchard wrote:
>
> The further I go, the more complex it is getting.  First, yes I have a 
> WS-2813U-IT and yes, I did set the relative pressure to match the local 
> weather service.
>
> I don't want to muddy the waters any more, but how is it that I stopped 
> the wewx service but it is still reporting?  I'm still trying to understand 
> this thing.
>
> On Tuesday, February 11, 2020 at 5:04:02 PM UTC-8, gjr80 wrote:
>>
>> On Wednesday, 12 February 2020 10:16:47 UTC+10, Dan Blanchard wrote:
>>>
>>> OK, I shut down via sudo /etc/init.d/weewx stop then I ran sudo weewxd 
>>> /etc/weewx/weewx.conf and it is continuing to produce data.  I see that 
>>> the barometer and altimeter are both the 32.xx readings while pressure is 
>>> the same as what is reading on my station 29.9x.
>>>
>>> Hang on, let's go through this a bit more carefully. So you have run 
>> WeeWX directly and are seeing all three WeeWX pressure fields. WeeWX field 
>> pressure is matching what is on your console exactly. Fields altitude 
>> and barometer are 'in the 32s'. By my rough calculations an absolute 
>> pressure of 29.9inHg at 2300ft gives a barometer value of about 32.5. So on 
>> the face of it it would appear that the driver is providing data (whether 
>> it is right or wrong) in field pressure and WeeWX is calculating fields 
>> barometer and altimeter as expected.
>>
>> Can I ge weewx to read the pressure reading in lieu of the barometer 
>>> altimeter reading that it is presumably doing?
>>>
>>
>> Now I don't understand. The 28xx driver takes the pressure value 
>> displayed on the station hardware and feeds that to WeeWX as the WeeWX 
>> field named pressure (after which WeeWX calculates fields barometer and 
>> altitude). Do you want the driver to instead take that pressure value 
>> displayed on the station hardware and feed that to WeeWX as the WeeWX field 
>> named barometer (after which WeeWX calculates fields pressure and 
>> altitude)? That can be done but it requires modification of the driver 
>> code, I would not being doing that lightly, someone did not roll a dice and 
>> randomly decide to put the pressure value from the 2813 in field pressure, 
>> it was done for a reason.
>>
>> I was looking for a 2813 manual and the only manual I could find was for 
>> a WS-2813U-IT weather station. On page 14 it talks about setting a 
>> 'Relative value pressure reference setting' based on a value from a weather 
>> service, airport etc. Is that your station and have you set that correctly 
>> or if not your station is there a similar setting?
>>
>> Gary
>>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

The further I go, the more complex it is getting.  First, yes I have a 
WS-2813U-IT and yes, I did set the relative pressure to match the local 
weather service.

I don't want to muddy the waters any more, but how is it that I stopped the 
wewx service but it is still reporting?  I'm still trying to understand 
this thing.

On Tuesday, February 11, 2020 at 5:04:02 PM UTC-8, gjr80 wrote:
>
> On Wednesday, 12 February 2020 10:16:47 UTC+10, Dan Blanchard wrote:
>>
>> OK, I shut down via sudo /etc/init.d/weewx stop then I ran sudo weewxd 
>> /etc/weewx/weewx.conf and it is continuing to produce data.  I see that 
>> the barometer and altimeter are both the 32.xx readings while pressure is 
>> the same as what is reading on my station 29.9x.
>>
>> Hang on, let's go through this a bit more carefully. So you have run 
> WeeWX directly and are seeing all three WeeWX pressure fields. WeeWX field 
> pressure is matching what is on your console exactly. Fields altitude and 
> barometer are 'in the 32s'. By my rough calculations an absolute pressure 
> of 29.9inHg at 2300ft gives a barometer value of about 32.5. So on the face 
> of it it would appear that the driver is providing data (whether it is 
> right or wrong) in field pressure and WeeWX is calculating fields 
> barometer and altimeter as expected.
>
> Can I ge weewx to read the pressure reading in lieu of the barometer 
>> altimeter reading that it is presumably doing?
>>
>
> Now I don't understand. The 28xx driver takes the pressure value displayed 
> on the station hardware and feeds that to WeeWX as the WeeWX field named 
> pressure (after which WeeWX calculates fields barometer and altitude). Do 
> you want the driver to instead take that pressure value displayed on the 
> station hardware and feed that to WeeWX as the WeeWX field named barometer 
> (after which WeeWX calculates fields pressure and altitude)? That can be 
> done but it requires modification of the driver code, I would not being 
> doing that lightly, someone did not roll a dice and randomly decide to put 
> the pressure value from the 2813 in field pressure, it was done for a 
> reason.
>
> I was looking for a 2813 manual and the only manual I could find was for a 
> WS-2813U-IT weather station. On page 14 it talks about setting a 'Relative 
> value pressure reference setting' based on a value from a weather service, 
> airport etc. Is that your station and have you set that correctly or if not 
> your station is there a similar setting?
>
> Gary
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

On Wednesday, 12 February 2020 10:16:47 UTC+10, Dan Blanchard wrote:
>
> OK, I shut down via sudo /etc/init.d/weewx stop then I ran sudo weewxd 
> /etc/weewx/weewx.conf and it is continuing to produce data.  I see that 
> the barometer and altimeter are both the 32.xx readings while pressure is 
> the same as what is reading on my station 29.9x.
>
> Hang on, let's go through this a bit more carefully. So you have run WeeWX 
directly and are seeing all three WeeWX pressure fields. WeeWX field 
pressure is matching what is on your console exactly. Fields altitude and 
barometer are 'in the 32s'. By my rough calculations an absolute pressure 
of 29.9inHg at 2300ft gives a barometer value of about 32.5. So on the face 
of it it would appear that the driver is providing data (whether it is 
right or wrong) in field pressure and WeeWX is calculating fields barometer 
and altimeter as expected.

Can I ge weewx to read the pressure reading in lieu of the barometer 
> altimeter reading that it is presumably doing?
>

Now I don't understand. The 28xx driver takes the pressure value displayed 
on the station hardware and feeds that to WeeWX as the WeeWX field named 
pressure (after which WeeWX calculates fields barometer and altitude). Do 
you want the driver to instead take that pressure value displayed on the 
station hardware and feed that to WeeWX as the WeeWX field named barometer 
(after which WeeWX calculates fields pressure and altitude)? That can be 
done but it requires modification of the driver code, I would not being 
doing that lightly, someone did not roll a dice and randomly decide to put 
the pressure value from the 2813 in field pressure, it was done for a 
reason.

I was looking for a 2813 manual and the only manual I could find was for a 
WS-2813U-IT weather station. On page 14 it talks about setting a 'Relative 
value pressure reference setting' based on a value from a weather service, 
airport etc. Is that your station and have you set that correctly or if not 
your station is there a similar setting?

Gary

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

OK, I shut down via sudo /etc/init.d/weewx stop then I ran sudo weewxd 
/etc/weewx/weewx.conf and it is continuing to produce data.  I see that the 
barometer and altimeter are both the 32.xx readings while pressure is the 
same as what is reading on my station 29.9x.

Can I ge weewx to read the pressure reading in lieu of the barometer 
altimeter reading that it is presumably doing?



On Tuesday, February 11, 2020 at 4:10:07 PM UTC-8, gjr80 wrote:
>
> Yes, that will shutdown a well behaved WeeWX service. Try that to start 
> with.
>
> Gary
>
> On Wednesday, 12 February 2020 09:58:21 UTC+10, Dan Blanchard wrote:
>>
>> Do you mean sudo /etc/init.d/weewx stop
>>
>> On Tuesday, February 11, 2020 at 2:55:34 PM UTC-8, gjr80 wrote:
>>>
>>> OK, and what happens if you shutdown/kill all running instances of WeeWX.
>>>
>>> Gary
>>>
>>> On Wednesday, 12 February 2020 08:48:43 UTC+10, Dan Blanchard wrote:

 I've attached the latest log and new screenshot

 On Tuesday, February 11, 2020 at 2:40:04 PM UTC-8, gjr80 wrote:
>
> That is bizarre, but sudo weewxd weewx.conf still gives a reaction 
> and error. Nothing appears in the log?
>
> Gary
>
> On Wednesday, 12 February 2020 08:33:55 UTC+10, Dan Blanchard wrote:
>>
>> Screen shot attached
>>
>> On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:
>>>
>>> What is nothing? Does it just return to the command prompt? Can you 
>>> post a screenshot of the exact command entered and the entire response.
>>>
>>> Gary
>>>
>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

Yes, that will shutdown a well behaved WeeWX service. Try that to start 
with.

Gary

On Wednesday, 12 February 2020 09:58:21 UTC+10, Dan Blanchard wrote:
>
> Do you mean sudo /etc/init.d/weewx stop
>
> On Tuesday, February 11, 2020 at 2:55:34 PM UTC-8, gjr80 wrote:
>>
>> OK, and what happens if you shutdown/kill all running instances of WeeWX.
>>
>> Gary
>>
>> On Wednesday, 12 February 2020 08:48:43 UTC+10, Dan Blanchard wrote:
>>>
>>> I've attached the latest log and new screenshot
>>>
>>> On Tuesday, February 11, 2020 at 2:40:04 PM UTC-8, gjr80 wrote:

 That is bizarre, but sudo weewxd weewx.conf still gives a reaction and 
 error. Nothing appears in the log?

 Gary

 On Wednesday, 12 February 2020 08:33:55 UTC+10, Dan Blanchard wrote:
>
> Screen shot attached
>
> On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:
>>
>> What is nothing? Does it just return to the command prompt? Can you 
>> post a screenshot of the exact command entered and the entire response.
>>
>> Gary
>>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Do you mean sudo /etc/init.d/weewx stop

On Tuesday, February 11, 2020 at 2:55:34 PM UTC-8, gjr80 wrote:
>
> OK, and what happens if you shutdown/kill all running instances of WeeWX.
>
> Gary
>
> On Wednesday, 12 February 2020 08:48:43 UTC+10, Dan Blanchard wrote:
>>
>> I've attached the latest log and new screenshot
>>
>> On Tuesday, February 11, 2020 at 2:40:04 PM UTC-8, gjr80 wrote:
>>>
>>> That is bizarre, but sudo weewxd weewx.conf still gives a reaction and 
>>> error. Nothing appears in the log?
>>>
>>> Gary
>>>
>>> On Wednesday, 12 February 2020 08:33:55 UTC+10, Dan Blanchard wrote:

 Screen shot attached

 On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:
>
> What is nothing? Does it just return to the command prompt? Can you 
> post a screenshot of the exact command entered and the entire response.
>
> Gary
>


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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

OK, and what happens if you shutdown/kill all running instances of WeeWX.

Gary

On Wednesday, 12 February 2020 08:48:43 UTC+10, Dan Blanchard wrote:
>
> I've attached the latest log and new screenshot
>
> On Tuesday, February 11, 2020 at 2:40:04 PM UTC-8, gjr80 wrote:
>>
>> That is bizarre, but sudo weewxd weewx.conf still gives a reaction and 
>> error. Nothing appears in the log?
>>
>> Gary
>>
>> On Wednesday, 12 February 2020 08:33:55 UTC+10, Dan Blanchard wrote:
>>>
>>> Screen shot attached
>>>
>>> On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:

 What is nothing? Does it just return to the command prompt? Can you 
 post a screenshot of the exact command entered and the entire response.

 Gary

>>>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

That is bizarre, but sudo weewxd weewx.conf still gives a reaction and 
error. Nothing appears in the log?

Gary

On Wednesday, 12 February 2020 08:33:55 UTC+10, Dan Blanchard wrote:
>
> Screen shot attached
>
> On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:
>>
>> What is nothing? Does it just return to the command prompt? Can you post 
>> a screenshot of the exact command entered and the entire response.
>>
>> Gary
>>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Screen shot attached

On Tuesday, February 11, 2020 at 12:30:30 PM UTC-8, gjr80 wrote:
>
> What is nothing? Does it just return to the command prompt? Can you post a 
> screenshot of the exact command entered and the entire response.
>
> Gary
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

What is nothing? Does it just return to the command prompt? Can you post a 
screenshot of the exact command entered and the entire response.

Gary

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

First of all, thanks for sticking with me on this.  I apologize for my 
denseness on this matter.  I am apparently not running the proper weewxd; 
I've tried sudo weewxd /etc/weewx/weewx.conf and get nothing. I do not know 
how to see what pressures are being include in loop packet and archive 
records. A little more remedial help is appreciated.  Thanks

On Tuesday, February 11, 2020 at 9:51:23 AM UTC-8, ln77 wrote:
>
> The link in Gary’s mail explains how to run it — just give the full path 
> to the config file as an argument to weewxd. Something like:
> sudo weewxd /etc/weewx/weewx.conf
>
>   -Les
>
>
> On Feb 11, 2020, at 9:21 AM, Dan Blanchard  > wrote:
>
> 
> I have confirmed and to the best of my knowledge, the station altitude is 
> set correctly (altitude = 2320 foot).
>
> When I run weewx directly (sudo weewxd weewx.conf) I get the following:
>
> Traceback (most recent call last):
>   File "/usr/bin/weewxd", line 64, in 
> weewx.engine.main(options, args)
>   File "/usr/share/weewx/weewx/engine.py", line 852, in main
> sane = os.stat(config_path).st_ctime
> OSError: [Errno 2] No such file or directory: '/home/pi/weewx.conf'
>
> I really do not understand what that means.  I went and looked at line 64 
> and 852 but don't know enough to see a problem.  I understand the last line 
> because my config file is at /etc/weewx/weewx.conf.  Is there another way 
> to run it directly?
>
> Once I get past this step, I can try the other suggestions you had.
>
> On Tuesday, February 11, 2020 at 2:03:38 AM UTC-8, gjr80 wrote:
>>
>> Sorry, only use hPa here so the obvious nonsense inHg value was lost on 
>> me.
>>
>> WeeWX is flexible enough that you change whatever you want to display on 
>> your web page, you can use another field or recalculate using whatever you 
>> like, it's just a case of altering the appropriate template. Similarly, you 
>> can change what is sent to WU, WeeWX is coded to send field barometer, 
>> to change that you need to dig into the code and your changes would likely 
>> not be safe across an upgrade.
>>
>> In terms of solutions, one obvious check is that you have your station 
>> altitude set correctly in weewx.conf. You are after the altitude setting 
>> under [Station]. If altitude is set correctly then the solution is in 
>> the driver. The WS-2813 driver emits pressure and WeeWX calculates 
>> barometer and altitude. Have you run WeeWX directly 
>>  to see what 
>> pressures are being include in loop packet and archive records. You should 
>> see all three pressures included as the data sent to console is after WeeWX 
>> has augmented the packet/record with whatever derived fields it can.
>>
>> Unfortunately it looks like the WS-2813 driver cannot be run stand alone 
>> which would be handy to see exactly what data is coming from the driver (as 
>> opposed to running WeeWX directly which include driver and WeeWX calculated 
>> fields). You can driver only data by disabling the WeeWX StdWXCalculate 
>> service that calculates the additional fields. To disable StdWXCalculate 
>> edit weewx.conf and locate the process_services setting under [Engine] 
>> [[Services]]. It should look something like this:
>>
>> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
>> weewx.engine.StdQC, weewx.wxservices.StdWXCalculate
>>
>> just put a # in front of the StdWXCalculate service as follows:
>>
>> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
>> weewx.engine.StdQC #, weewx.wxservices.StdWXCalculate
>>
>> save and stop WeeWX if running and then run directly 
>>  again. This time 
>> you should see no derived fields added and what you see should be coming 
>> from the driver. What pressure field is provide and if it is pressure is 
>> it indeed station pressure? If this is the case then the issue lies 
>> elsewhere, if not then the driver needs some scrutiny.
>>
>> Gary
>>
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> 
> .
>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

The link in Gary’s mail explains how to run it — just give the full path to the 
config file as an argument to weewxd. Something like:
sudo weewxd /etc/weewx/weewx.conf

  -Les


> On Feb 11, 2020, at 9:21 AM, Dan Blanchard  wrote:
> 
> 
> I have confirmed and to the best of my knowledge, the station altitude is set 
> correctly (altitude = 2320 foot).
> 
> When I run weewx directly (sudo weewxd weewx.conf) I get the following:
> 
> Traceback (most recent call last):
>   File "/usr/bin/weewxd", line 64, in 
> weewx.engine.main(options, args)
>   File "/usr/share/weewx/weewx/engine.py", line 852, in main
> sane = os.stat(config_path).st_ctime
> OSError: [Errno 2] No such file or directory: '/home/pi/weewx.conf'
> 
> I really do not understand what that means.  I went and looked at line 64 and 
> 852 but don't know enough to see a problem.  I understand the last line 
> because my config file is at /etc/weewx/weewx.conf.  Is there another way to 
> run it directly?
> 
> Once I get past this step, I can try the other suggestions you had.
> 
>> On Tuesday, February 11, 2020 at 2:03:38 AM UTC-8, gjr80 wrote:
>> Sorry, only use hPa here so the obvious nonsense inHg value was lost on me.
>> 
>> WeeWX is flexible enough that you change whatever you want to display on 
>> your web page, you can use another field or recalculate using whatever you 
>> like, it's just a case of altering the appropriate template. Similarly, you 
>> can change what is sent to WU, WeeWX is coded to send field barometer, to 
>> change that you need to dig into the code and your changes would likely not 
>> be safe across an upgrade.
>> 
>> In terms of solutions, one obvious check is that you have your station 
>> altitude set correctly in weewx.conf. You are after the altitude setting 
>> under [Station]. If altitude is set correctly then the solution is in the 
>> driver. The WS-2813 driver emits pressure and WeeWX calculates barometer and 
>> altitude. Have you run WeeWX directly to see what pressures are being 
>> include in loop packet and archive records. You should see all three 
>> pressures included as the data sent to console is after WeeWX has augmented 
>> the packet/record with whatever derived fields it can.
>> 
>> Unfortunately it looks like the WS-2813 driver cannot be run stand alone 
>> which would be handy to see exactly what data is coming from the driver (as 
>> opposed to running WeeWX directly which include driver and WeeWX calculated 
>> fields). You can driver only data by disabling the WeeWX StdWXCalculate 
>> service that calculates the additional fields. To disable StdWXCalculate 
>> edit weewx.conf and locate the process_services setting under [Engine] 
>> [[Services]]. It should look something like this:
>> 
>> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
>> weewx.engine.StdQC, weewx.wxservices.StdWXCalculate
>> 
>> just put a # in front of the StdWXCalculate service as follows:
>> 
>> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
>> weewx.engine.StdQC #, weewx.wxservices.StdWXCalculate
>> 
>> save and stop WeeWX if running and then run directly again. This time you 
>> should see no derived fields added and what you see should be coming from 
>> the driver. What pressure field is provide and if it is pressure is it 
>> indeed station pressure? If this is the case then the issue lies elsewhere, 
>> if not then the driver needs some scrutiny.
>> 
>> Gary
> 
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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

I have confirmed and to the best of my knowledge, the station altitude is 
set correctly (altitude = 2320 foot).

When I run weewx directly (sudo weewxd weewx.conf) I get the following:

Traceback (most recent call last):
  File "/usr/bin/weewxd", line 64, in 
weewx.engine.main(options, args)
  File "/usr/share/weewx/weewx/engine.py", line 852, in main
sane = os.stat(config_path).st_ctime
OSError: [Errno 2] No such file or directory: '/home/pi/weewx.conf'

I really do not understand what that means.  I went and looked at line 64 
and 852 but don't know enough to see a problem.  I understand the last line 
because my config file is at /etc/weewx/weewx.conf.  Is there another way 
to run it directly?

Once I get past this step, I can try the other suggestions you had.

On Tuesday, February 11, 2020 at 2:03:38 AM UTC-8, gjr80 wrote:
>
> Sorry, only use hPa here so the obvious nonsense inHg value was lost on me.
>
> WeeWX is flexible enough that you change whatever you want to display on 
> your web page, you can use another field or recalculate using whatever you 
> like, it's just a case of altering the appropriate template. Similarly, you 
> can change what is sent to WU, WeeWX is coded to send field barometer, to 
> change that you need to dig into the code and your changes would likely not 
> be safe across an upgrade.
>
> In terms of solutions, one obvious check is that you have your station 
> altitude set correctly in weewx.conf. You are after the altitude setting 
> under [Station]. If altitude is set correctly then the solution is in the 
> driver. The WS-2813 driver emits pressure and WeeWX calculates barometer 
> and altitude. Have you run WeeWX directly 
>  to see what 
> pressures are being include in loop packet and archive records. You should 
> see all three pressures included as the data sent to console is after WeeWX 
> has augmented the packet/record with whatever derived fields it can.
>
> Unfortunately it looks like the WS-2813 driver cannot be run stand alone 
> which would be handy to see exactly what data is coming from the driver (as 
> opposed to running WeeWX directly which include driver and WeeWX calculated 
> fields). You can driver only data by disabling the WeeWX StdWXCalculate 
> service that calculates the additional fields. To disable StdWXCalculate 
> edit weewx.conf and locate the process_services setting under [Engine] 
> [[Services]]. It should look something like this:
>
> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
> weewx.engine.StdQC, weewx.wxservices.StdWXCalculate
>
> just put a # in front of the StdWXCalculate service as follows:
>
> process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, 
> weewx.engine.StdQC #, weewx.wxservices.StdWXCalculate
>
> save and stop WeeWX if running and then run directly 
>  again. This time 
> you should see no derived fields added and what you see should be coming 
> from the driver. What pressure field is provide and if it is pressure is 
> it indeed station pressure? If this is the case then the issue lies 
> elsewhere, if not then the driver needs some scrutiny.
>
> Gary
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

Sorry, only use hPa here so the obvious nonsense inHg value was lost on me.

WeeWX is flexible enough that you change whatever you want to display on 
your web page, you can use another field or recalculate using whatever you 
like, it's just a case of altering the appropriate template. Similarly, you 
can change what is sent to WU, WeeWX is coded to send field barometer, to 
change that you need to dig into the code and your changes would likely not 
be safe across an upgrade.

In terms of solutions, one obvious check is that you have your station 
altitude set correctly in weewx.conf. You are after the altitude setting 
under [Station]. If altitude is set correctly then the solution is in the 
driver. The WS-2813 driver emits pressure and WeeWX calculates barometer 
and altitude. Have you run WeeWX directly 
 to see what 
pressures are being include in loop packet and archive records. You should 
see all three pressures included as the data sent to console is after WeeWX 
has augmented the packet/record with whatever derived fields it can.

Unfortunately it looks like the WS-2813 driver cannot be run stand alone 
which would be handy to see exactly what data is coming from the driver (as 
opposed to running WeeWX directly which include driver and WeeWX calculated 
fields). You can driver only data by disabling the WeeWX StdWXCalculate 
service that calculates the additional fields. To disable StdWXCalculate 
edit weewx.conf and locate the process_services setting under [Engine] 
[[Services]]. It should look something like this:

process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, weewx
.engine.StdQC, weewx.wxservices.StdWXCalculate

just put a # in front of the StdWXCalculate service as follows:

process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, weewx
.engine.StdQC #, weewx.wxservices.StdWXCalculate

save and stop WeeWX if running and then run directly 
 again. This time 
you should see no derived fields added and what you see should be coming 
from the driver. What pressure field is provide and if it is pressure is it 
indeed station pressure? If this is the case then the issue lies elsewhere, 
if not then the driver needs some scrutiny.

Gary

On Tuesday, 11 February 2020 01:59:28 UTC+10, Dan Blanchard wrote:
>
> Agreed.  If this is the case, can I configure weewx to show a different 
> pressure?  If so, how do I do that?
>
> On Monday, February 10, 2020 at 6:00:07 AM UTC-8, ln77 wrote:
>>
>> 33” is clearly too high for the barometric pressure. It is within 
>> spitting distance of what you would get if the pressure is corrected for 
>> your 2300’ elevation twice. Maybe the station is giving the corrected 
>> pressure but weewx is configured to think it’s the uncorrected pressure?
>>
>>   -Les
>>
>>
>> On Feb 9, 2020, at 6:00 PM, Dan Blanchard  wrote:
>>
>> 
>> OK, let me absorb this information a bit and see what I can figure out.
>>
>> On Sunday, February 9, 2020 at 4:56:30 PM UTC-8, gjr80 wrote:
>>>
>>> On Monday, 10 February 2020 10:35:37 UTC+10, Dan Blanchard wrote:

 My station labels it as 'Pressure inHg' which is currently 30.30 and 
 matches others in the area.

>>>
>>> I presume you mean the station display. The use of 'Pressure' is 
>>> consistent with it being station pressure but it could mean anything, would 
>>> not be the first time weather station hardware manufacturers have been 
>>> vague, liberal with the truth or just wrong.
>>>
>>> So I am a bit confused between what you said about barometric pressure 
 vs. raw pressure.

>>>
>>> Did you read the wiki article about the three different pressures that 
>>> WeeWX uses? Could you explain what it is that confuses you?
>>>  
>>>
 Ultimately, is there a fix for me?  Can I make some kind of adjustment?

>>>
>>> Not sure what you are trying to fix, if the issue is that you want 
>>> everything to display the same value then sure there are changes you can 
>>> make. Since you can't change what the station hardware displays you need to 
>>> change what WeeWX and WU displays. Changing what WeeWX displays is easy, as 
>>> I said its a simple change to a template. Changing what WU displays is more 
>>> complex and involves changing the WeeWX WU uploader to upload WeeWX field 
>>> pressure instead of field barometer. If you go down this path you need 
>>> to accept a few things. Firstly, your WU data will be inaccurate (it 
>>> expects barometric pressure and you will be sending it station pressure). 
>>> Secondly, your changes to the template will be safe but your changes to the 
>>> WU uploader will likely be overwritten each time you upgrade WeeWX.
>>>
>>> I am not familiar with the WS-2813 so do not know if there is any 
>>> ability to change what pressure it displays, I suspect there will not be a 
>>> means though.
>>>
>>> At the end of the day you might be di

Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Agreed.  If this is the case, can I configure weewx to show a different 
pressure?  If so, how do I do that?

On Monday, February 10, 2020 at 6:00:07 AM UTC-8, ln77 wrote:
>
> 33” is clearly too high for the barometric pressure. It is within spitting 
> distance of what you would get if the pressure is corrected for your 2300’ 
> elevation twice. Maybe the station is giving the corrected pressure but 
> weewx is configured to think it’s the uncorrected pressure?
>
>   -Les
>
>
> On Feb 9, 2020, at 6:00 PM, Dan Blanchard  > wrote:
>
> 
> OK, let me absorb this information a bit and see what I can figure out.
>
> On Sunday, February 9, 2020 at 4:56:30 PM UTC-8, gjr80 wrote:
>>
>> On Monday, 10 February 2020 10:35:37 UTC+10, Dan Blanchard wrote:
>>>
>>> My station labels it as 'Pressure inHg' which is currently 30.30 and 
>>> matches others in the area.
>>>
>>
>> I presume you mean the station display. The use of 'Pressure' is 
>> consistent with it being station pressure but it could mean anything, would 
>> not be the first time weather station hardware manufacturers have been 
>> vague, liberal with the truth or just wrong.
>>
>> So I am a bit confused between what you said about barometric pressure 
>>> vs. raw pressure.
>>>
>>
>> Did you read the wiki article about the three different pressures that 
>> WeeWX uses? Could you explain what it is that confuses you?
>>  
>>
>>> Ultimately, is there a fix for me?  Can I make some kind of adjustment?
>>>
>>
>> Not sure what you are trying to fix, if the issue is that you want 
>> everything to display the same value then sure there are changes you can 
>> make. Since you can't change what the station hardware displays you need to 
>> change what WeeWX and WU displays. Changing what WeeWX displays is easy, as 
>> I said its a simple change to a template. Changing what WU displays is more 
>> complex and involves changing the WeeWX WU uploader to upload WeeWX field 
>> pressure instead of field barometer. If you go down this path you need 
>> to accept a few things. Firstly, your WU data will be inaccurate (it 
>> expects barometric pressure and you will be sending it station pressure). 
>> Secondly, your changes to the template will be safe but your changes to the 
>> WU uploader will likely be overwritten each time you upgrade WeeWX.
>>
>> I am not familiar with the WS-2813 so do not know if there is any ability 
>> to change what pressure it displays, I suspect there will not be a means 
>> though.
>>
>> At the end of the day you might be displaying a different value to a lot 
>> of other folks, doesn't make them right and you wrong though.
>>
>> Gary
>>
>>
>>
>>
>>
>>
>>> On Sunday, February 9, 2020 at 4:29:42 PM UTC-8, gjr80 wrote:

 Slightly, but still apples and oranges. By default WeeWX displays 
 barometric pressure so WeeWX and WU displaying the same 'pressure' is 
 expected behaviour. The 'pressure' displayed by WeeWX can be changed with 
 a 
 simple change to a template, unfortunately what cannot be changed is what 
 WU expects and (usually) what your station hardware displays.

 Gary

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> 
> .
>
>

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Re: [weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Les Niles]

33” is clearly too high for the barometric pressure. It is within spitting 
distance of what you would get if the pressure is corrected for your 2300’ 
elevation twice. Maybe the station is giving the corrected pressure but weewx 
is configured to think it’s the uncorrected pressure?

  -Les


> On Feb 9, 2020, at 6:00 PM, Dan Blanchard  wrote:
> 
> 
> OK, let me absorb this information a bit and see what I can figure out.
> 
>> On Sunday, February 9, 2020 at 4:56:30 PM UTC-8, gjr80 wrote:
>>> On Monday, 10 February 2020 10:35:37 UTC+10, Dan Blanchard wrote:
>>> My station labels it as 'Pressure inHg' which is currently 30.30 and 
>>> matches others in the area.
>> 
>> I presume you mean the station display. The use of 'Pressure' is consistent 
>> with it being station pressure but it could mean anything, would not be the 
>> first time weather station hardware manufacturers have been vague, liberal 
>> with the truth or just wrong.
>> 
>>> So I am a bit confused between what you said about barometric pressure vs. 
>>> raw pressure.
>> 
>> Did you read the wiki article about the three different pressures that WeeWX 
>> uses? Could you explain what it is that confuses you?
>>  
>>> Ultimately, is there a fix for me?  Can I make some kind of adjustment?
>> 
>> Not sure what you are trying to fix, if the issue is that you want 
>> everything to display the same value then sure there are changes you can 
>> make. Since you can't change what the station hardware displays you need to 
>> change what WeeWX and WU displays. Changing what WeeWX displays is easy, as 
>> I said its a simple change to a template. Changing what WU displays is more 
>> complex and involves changing the WeeWX WU uploader to upload WeeWX field 
>> pressure instead of field barometer. If you go down this path you need to 
>> accept a few things. Firstly, your WU data will be inaccurate (it expects 
>> barometric pressure and you will be sending it station pressure). Secondly, 
>> your changes to the template will be safe but your changes to the WU 
>> uploader will likely be overwritten each time you upgrade WeeWX.
>> 
>> I am not familiar with the WS-2813 so do not know if there is any ability to 
>> change what pressure it displays, I suspect there will not be a means though.
>> 
>> At the end of the day you might be displaying a different value to a lot of 
>> other folks, doesn't make them right and you wrong though.
>> 
>> Gary
>> 
>> 
>> 
>> 
>> 
>>> 
 On Sunday, February 9, 2020 at 4:29:42 PM UTC-8, gjr80 wrote:
 Slightly, but still apples and oranges. By default WeeWX displays 
 barometric pressure so WeeWX and WU displaying the same 'pressure' is 
 expected behaviour. The 'pressure' displayed by WeeWX can be changed with 
 a simple change to a template, unfortunately what cannot be changed is 
 what WU expects and (usually) what your station hardware displays.
 
 Gary
> 
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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

OK, let me absorb this information a bit and see what I can figure out.

On Sunday, February 9, 2020 at 4:56:30 PM UTC-8, gjr80 wrote:
>
> On Monday, 10 February 2020 10:35:37 UTC+10, Dan Blanchard wrote:
>>
>> My station labels it as 'Pressure inHg' which is currently 30.30 and 
>> matches others in the area.
>>
>
> I presume you mean the station display. The use of 'Pressure' is 
> consistent with it being station pressure but it could mean anything, would 
> not be the first time weather station hardware manufacturers have been 
> vague, liberal with the truth or just wrong.
>
> So I am a bit confused between what you said about barometric pressure vs. 
>> raw pressure.
>>
>
> Did you read the wiki article about the three different pressures that 
> WeeWX uses? Could you explain what it is that confuses you?
>  
>
>> Ultimately, is there a fix for me?  Can I make some kind of adjustment?
>>
>
> Not sure what you are trying to fix, if the issue is that you want 
> everything to display the same value then sure there are changes you can 
> make. Since you can't change what the station hardware displays you need to 
> change what WeeWX and WU displays. Changing what WeeWX displays is easy, as 
> I said its a simple change to a template. Changing what WU displays is more 
> complex and involves changing the WeeWX WU uploader to upload WeeWX field 
> pressure instead of field barometer. If you go down this path you need to 
> accept a few things. Firstly, your WU data will be inaccurate (it expects 
> barometric pressure and you will be sending it station pressure). Secondly, 
> your changes to the template will be safe but your changes to the WU 
> uploader will likely be overwritten each time you upgrade WeeWX.
>
> I am not familiar with the WS-2813 so do not know if there is any ability 
> to change what pressure it displays, I suspect there will not be a means 
> though.
>
> At the end of the day you might be displaying a different value to a lot 
> of other folks, doesn't make them right and you wrong though.
>
> Gary
>
>
>
>
>
>
>> On Sunday, February 9, 2020 at 4:29:42 PM UTC-8, gjr80 wrote:
>>>
>>> Slightly, but still apples and oranges. By default WeeWX displays 
>>> barometric pressure so WeeWX and WU displaying the same 'pressure' is 
>>> expected behaviour. The 'pressure' displayed by WeeWX can be changed with a 
>>> simple change to a template, unfortunately what cannot be changed is what 
>>> WU expects and (usually) what your station hardware displays.
>>>
>>> Gary
>>>
>>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

On Monday, 10 February 2020 10:35:37 UTC+10, Dan Blanchard wrote:
>
> My station labels it as 'Pressure inHg' which is currently 30.30 and 
> matches others in the area.
>

I presume you mean the station display. The use of 'Pressure' is consistent 
with it being station pressure but it could mean anything, would not be the 
first time weather station hardware manufacturers have been vague, liberal 
with the truth or just wrong.

So I am a bit confused between what you said about barometric pressure vs. 
> raw pressure.
>

Did you read the wiki article about the three different pressures that 
WeeWX uses? Could you explain what it is that confuses you?
 

> Ultimately, is there a fix for me?  Can I make some kind of adjustment?
>

Not sure what you are trying to fix, if the issue is that you want 
everything to display the same value then sure there are changes you can 
make. Since you can't change what the station hardware displays you need to 
change what WeeWX and WU displays. Changing what WeeWX displays is easy, as 
I said its a simple change to a template. Changing what WU displays is more 
complex and involves changing the WeeWX WU uploader to upload WeeWX field 
pressure instead of field barometer. If you go down this path you need to 
accept a few things. Firstly, your WU data will be inaccurate (it expects 
barometric pressure and you will be sending it station pressure). Secondly, 
your changes to the template will be safe but your changes to the WU 
uploader will likely be overwritten each time you upgrade WeeWX.

I am not familiar with the WS-2813 so do not know if there is any ability 
to change what pressure it displays, I suspect there will not be a means 
though.

At the end of the day you might be displaying a different value to a lot of 
other folks, doesn't make them right and you wrong though.

Gary






> On Sunday, February 9, 2020 at 4:29:42 PM UTC-8, gjr80 wrote:
>>
>> Slightly, but still apples and oranges. By default WeeWX displays 
>> barometric pressure so WeeWX and WU displaying the same 'pressure' is 
>> expected behaviour. The 'pressure' displayed by WeeWX can be changed with a 
>> simple change to a template, unfortunately what cannot be changed is what 
>> WU expects and (usually) what your station hardware displays.
>>
>> Gary
>>
>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

My station labels it as 'Pressure inHg' which is currently 30.30 and 
matches others in the area.  So I am a bit confused between what you said 
about barometric pressure vs. raw pressure.

Ultimately, is there a fix for me?  Can I make some kind of adjustment?

On Sunday, February 9, 2020 at 4:29:42 PM UTC-8, gjr80 wrote:
>
> Slightly, but still apples and oranges. By default WeeWX displays 
> barometric pressure so WeeWX and WU displaying the same 'pressure' is 
> expected behaviour. The 'pressure' displayed by WeeWX can be changed with a 
> simple change to a template, unfortunately what cannot be changed is what 
> WU expects and (usually) what your station hardware displays.
>
> Gary
>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

Slightly, but still apples and oranges. By default WeeWX displays 
barometric pressure so WeeWX and WU displaying the same 'pressure' is 
expected behaviour. The 'pressure' displayed by WeeWX can be changed with a 
simple change to a template, unfortunately what cannot be changed is what 
WU expects and (usually) what your station hardware displays.

Gary

On Monday, 10 February 2020 10:25:25 UTC+10, Dan Blanchard wrote:
>
>
> Thanks Gary, I think I understand what you are saying but the information 
> going to WU is the same as my file at /var/www/html/weewx/index.html.  Does 
> that change your answer?
>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Thanks Gary, I think I understand what you are saying but the information 
going to WU is the same as my file at /var/www/html/weewx/index.html.  Does 
that change your answer?

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[Dan Blanchard]

Thanks Gary, I think I understand what you are saying but the information 
going to WU is the same as my file at /var/www/html/weewx/index.html.  Does 
that change your answer?

On Sunday, February 9, 2020 at 4:21:15 PM UTC-8, gjr80 wrote:
>
> Hi,
>
> I suspect this is a case of comparing apples to oranges. WU wants to 
> receive barometric pressure which is pressure corrected for altitude and 
> pressure (and frequently humidity), but judging by the WeeWX Hardware 
> Guide  I suspect your 
> station displays station or gauge pressure which is the raw absolute 
> pressure. You can read about the three different pressures used by WeeWX 
>  
> in the wiki.
>
> I can't comment on what your previous software did in terms of which of 
> the pressures it sent to WU but perhaps it did not sent barometric pressure 
> or perhaps I am wrong about what your station displays :)
>
> Gary
>
> On Monday, 10 February 2020 09:36:51 UTC+10, Dan Blanchard wrote:
>>
>> I've been running my weather station on weeWX for 2 days now after 
>> switching from a PC based solution for the past several years.  I noticed 
>> this problem after noticing that my station is no longer showing on the 
>> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
>> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>>
>> Everything has been going fine except I am currently having a problem 
>> with data inaccuracies.  All the data seems correct except the barometer 
>> reading.  The reading on my hardware is currently 30.30 and weeWX is 
>> showing 33.093 which is what is reporting to WU.
>>
>> Can anyone please shed some light on this issue?  I've attached the 
>> syslog for reference.  Please let me know if there is anything else I can 
>> provide to help with this situation. If the solution requires changes in 
>> the configuration file, please be specific as I am still learning the Linux 
>> stuff.
>>
>> Thanks,
>>
>> Dan
>>
>>
>> Hardware: Lacrosse WS-2813
>>
>>

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[weewx-user] Re: Mismatch Between Hardware and weeWX Data

[gjr80]

Hi,

I suspect this is a case of comparing apples to oranges. WU wants to 
receive barometric pressure which is pressure corrected for altitude and 
pressure (and frequently humidity), but judging by the WeeWX Hardware Guide 
 I suspect your station 
displays station or gauge pressure which is the raw absolute pressure. You 
can read about the three different pressures used by WeeWX 
 in 
the wiki.

I can't comment on what your previous software did in terms of which of the 
pressures it sent to WU but perhaps it did not sent barometric pressure or 
perhaps I am wrong about what your station displays :)

Gary

On Monday, 10 February 2020 09:36:51 UTC+10, Dan Blanchard wrote:
>
> I've been running my weather station on weeWX for 2 days now after 
> switching from a PC based solution for the past several years.  I noticed 
> this problem after noticing that my station is no longer showing on the 
> WeatherUnderground (WU) maps.  The data is still showing for my site on WU 
> though (https://www.wunderground.com/dashboard/pws/KIDPOSTF43)
>
> Everything has been going fine except I am currently having a problem with 
> data inaccuracies.  All the data seems correct except the barometer 
> reading.  The reading on my hardware is currently 30.30 and weeWX is 
> showing 33.093 which is what is reporting to WU.
>
> Can anyone please shed some light on this issue?  I've attached the syslog 
> for reference.  Please let me know if there is anything else I can provide 
> to help with this situation. If the solution requires changes in the 
> configuration file, please be specific as I am still learning the Linux 
> stuff.
>
> Thanks,
>
> Dan
>
>
> Hardware: Lacrosse WS-2813
>
>

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