Paul and Tom,
(1) I did the addition that Tom suggested to weewx.conf and it did not
change the number of digits after doing a stop/start.
(2) I did the suggestion that Paul had and it did not change the number of
digits after doing a stop/start.
I added the following to the end of the [Vantage] section of wx.conf:
# Changing the loop request from 1 (default) to 3
loop_request = 3
This is the result after making both changes to weewx.conf (last number is
dewpoint):
1597623840,"2020-08-16 17:24:00",107.7,48.2011679891737
1597623780,"2020-08-16 17:23:00",107.8,48.2789309796842
1597623720,"2020-08-16 17:22:00",107.9,50.2068320569903
1597623660,"2020-08-16 17:21:00",107.9,51.9515297553893
1597623600,"2020-08-16 17:20:00",108.1,52.1095650274203
I don't completely understand what Loop1, Loop2, and Loop3 are so I guess
I'll have to spend some time poring over the Davis document that Paul
referred to. I do understand what Tom is saying about real format storage
and those extra digits just being artifacts of the storage method.
In the meantime.....maybe I'll just cut my losses and do as Tom suggests
and just keep using sprintf.
Interesting discussion....
Thanks,
Ken
On Sun, Aug 16, 2020 at 5:07 PM Paul R Anderson <p...@pauland.net> wrote:
> Alternative method would be to set Vantage driver loop_request to 3 so
> that you would get loop1 and loop2 data. Vantage loop2 provides dewpoint to
> 1 decimal point . Please review User Guide
> <http://www.weewx.com/docs/usersguide.htm#[Vantage]> and be sure you
> understand how to set it up , further changes are required.
>
> On a system here that is set up to alternate loop1 and loop2 here is a
> database query for dewpoint:
>
> sqlite> select datetime(dateTime,'unixepoch','localtime'),dewpoint from
> archive ORDER BY datetime desc limit 10;
> 2020-08-16 20:00:00|62.0
> 2020-08-16 19:55:00|62.0
> 2020-08-16 19:50:00|62.0
> 2020-08-16 19:45:00|62.0
> 2020-08-16 19:40:00|62.0
> 2020-08-16 19:35:00|62.0
> 2020-08-16 19:30:00|62.0
> 2020-08-16 19:25:00|62.0
> 2020-08-16 19:20:00|62.0
> 2020-08-16 19:15:00|62.0
>
> Paul
>
> On Sun, Aug 16, 2020 at 7:24 PM Tom Keffer <tkef...@gmail.com> wrote:
>
>> Archive records are what are stored in the database. A Vantage station
>> produces its own archive record (unless record_generation is set to
>> 'software'). However, for whatever reason, Vantage stations do not include
>> dewpoint in the hardware generated record, so WeeWX must calculate it. By
>> default, WeeWX calculates the average dewpoint seen over the archive
>> interval. If dewpoint changes over the interval, the average is not
>> necessarily an even number.
>>
>> One way around this is to have WeeWX calculate the last value seen,
>> instead of the average. Add this to the end of your weewx.conf file:
>>
>> [Accumulator]
>> [[dewpoint]]
>> extractor = last
>>
>> Alternatively, what sort of external programs are you writing? Does the
>> language you are using provide a way to format decimal output?
>>
>> -tk
>>
>>
>> On Sun, Aug 16, 2020 at 3:16 PM satwa...@gmail.com <satwatch...@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I searched the group for this subject and couldn't find anything so I am
>>> posting.
>>>
>>> I have the Vantage Pro 2, serial interface to Weewx 3.9.2 run on an
>>> Ubuntu server.
>>>
>>> Below is a sample line from the archive database (broke into individual
>>> lines due to width) using the command:
>>> sqlite3 -header -csv /var/lib/weewx/weewx.sdb "select * from archive;"
>>>
>>> One line from the output:
>>> 1597612740,1,1,29.617,28.0238601652778,29.7814033867068,83.7,*115.4*,
>>> 38.0,18.0,0.0,,1.0,225.0,0.0,0.0,*61.1737982063856*,115.4,
>>> 115.4,0.0,,,,,,,,,,,,,,,,,,,,93.9583333333333,0.0,5.31,,,,,,,,,,
>>>
>>> Note the temperature is reported as 115.4 degs (ugh...this is Arizona).
>>> The dewpoint is reported as 61.1737982063856. All dewpoint values in the
>>> database have a decimal precision of 13 places, clearly outside the sensor
>>> quality range. The sensor documentation indicates that it provides Relative
>>> Humidity values so apparently the console software derives the dewpoint
>>> value as it can be displayed on the console. I write a lot of external
>>> programs and have to repeatedly reduce the precision for this variable.
>>>
>>> Is there an easy way to modify my Weewx to store only 1 decimal place
>>> for dewpoint or other variables? I did check /etc/weewx/weewx.conf and
>>> could not find any obvious setting for this.
>>>
>>> Thanks for any assistance,
>>>
>>> Ken
>>>
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