Re: [weewx-user] Integrate rain24 with Packetsloop

[Remy Lavabre]

Sorry Tom, I didn't notice how quick your insight was! ;-)

However *(if I may!*), I think that for a better understanding, there would 
be (*perhaps?*) another correction to make here: 
https://github.com/weewx/weewx/blob/master/ src/weewx/wxxtypes.py#L586

Indeed, you indicate in comments a "rain" field and a "dayRain" field. I 
quote *"for calculating observation type 'rain' from a daily total, such as 
'dayRain'"* -> OK, thank's for the ifo

But below, dayRain "transforms" into "totalRain":

 [StdWXCalculate]
 [[Calculations]]
 ...
 rain = prefer_hardware
 ...
 [[Delta]]
 [[[rain]]]
 input = totalRain

It's certainly not a big problem, but for a neophyte like me, it raises 
unnecessary questions when reading the manual... ;-)

Finally, I would like to take this opportunity to ask you if it would not 
be possible to provide a new class for a counter that never resets to zero 
(DELTA2 for example), which would simply calculate the delta between two 
packetsloops (delta2 = measurement2 - measurement1) and if the result is 
negative, then delta2 = measurement2 (obviously the counter has been reset).
That would be very cool... ;-)
A (good) idea for development... no ?
Thank you Tom

Le dimanche 28 janvier 2024 à 18:40:37 UTC+1, Tom Keffer a écrit :

> Oh, it was the first thing I did after realizing my omission! Commit 
> 9455fa1 
> 
> .
>
> On Sun, Jan 28, 2024 at 7:30 AM Remy Lavabre  wrote:
>
>> thanks Tom,
>>
>> I had thought about putting rain = prefer_software but as this type of 
>> rain configuration is not documented in the Weewx documentation (or at 
>> least I didn't find it!) I didn't take the initiative. .. stupid I am ! :-(
>>
>> little suggestion Tom, perhaps it would be good to document this point in 
>> the [[Delta]] rain class? 
>> Well, not everyone is ignorant like me!! :-))
>> Many thanks to you for your help Tom
>>
>> Le dimanche 28 janvier 2024 à 00:21:43 UTC+1, Tom Keffer a écrit :
>>
>>> My apologies. I forgot one important detail. The "[Delta]" section tells 
>>> WeeWX how to calculate rain, but you also have to include "rain" under 
>>> [StdWXCalculations] / [[Calculations]] in order to get it to do the actual 
>>> calculation. It looks like
>>>
>>> [StdWXCalculate]
>>> [[Calculations]]
>>> ...
>>> rain = prefer_hardware
>>>
>>> ...
>>> [[Delta]]
>>> [[[rain]]]
>>> input = dayRain
>>>
>>> On Sat, Jan 27, 2024 at 9:17 AM Remy Lavabre  
>>> wrote:
>>>
 Hello Tom,

 I followed your instructions:

 1/“rain” field present in the database
 2/ “dayRain” field not present in the database
 3/ My driver returns “dayRain” values and not “rain” values in the 
 packetsloop
 4/ [[Delta]] [[ [rain]]] input = dayRain added in weewx.conf (under 
 [StdWXCalculate]).

 I did some tests : my driver returns 0.0 for dayRain but unfortunately 
 the "rain" field in my database always remains NULL, even after several 
 recordings in weewx.conf.
 Shouldn't "rain" field go to 0.0?

 THANKS

 Le vendredi 26 janvier 2024 à 22:48:03 UTC+1, Tom Keffer a écrit :

> If an observation type never gets reset to zero, you have two choices.
> 1. Save the value. If you want to know daily use, take the difference 
> of the value.
> 2. Save the difference. That is, the change in the value over an 
> archive period. If you want to know daily use, you would sum all the 
> small 
> deltas. This is like rain
>
> See the discussion *Accumulated vs delta energy 
> *
>  in 
> the README of the Brultech driver for the pros and cons of the two 
> approaches.
>
> It is not necessary to save "dayRain". WeeWX mostly uses "rain". 
> Besides, as you note, it can always be calculated.
>
>
>
> On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre  
> wrote:
>
>> And one more question
>> Is it absolutely necessary to create a "dayRain" field in addition to 
>> the "rain" field in the weewx.sdb database?
>> If the database only contains the [rain] field but the Weewx driver 
>> returns a "dayRain" field (cumulative rain over 24 hours since midnight) 
>> with a real value in each packetloop, the class [[Delta]] [[ [rain]]] 
>> input 
>> = dayRain will it work??
>> (the accumulation of rain since midnight is useless to me in a 
>> database field since it is easily calculated)
>> Sorry for all the questions...and thanks again! ;-)
>>
>> Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :
>>
>>> Hello Tom and thank you for your response.
>>>
>>>  [StdWXCalculate]
>>>  

Re: [weewx-user] Integrate rain24 with Packetsloop

[Tom Keffer]

Oh, it was the first thing I did after realizing my omission! Commit 9455fa1

.

On Sun, Jan 28, 2024 at 7:30 AM Remy Lavabre  wrote:

> thanks Tom,
>
> I had thought about putting rain = prefer_software but as this type of
> rain configuration is not documented in the Weewx documentation (or at
> least I didn't find it!) I didn't take the initiative. .. stupid I am ! :-(
>
> little suggestion Tom, perhaps it would be good to document this point in
> the [[Delta]] rain class?
> Well, not everyone is ignorant like me!! :-))
> Many thanks to you for your help Tom
>
> Le dimanche 28 janvier 2024 à 00:21:43 UTC+1, Tom Keffer a écrit :
>
>> My apologies. I forgot one important detail. The "[Delta]" section tells
>> WeeWX how to calculate rain, but you also have to include "rain" under
>> [StdWXCalculations] / [[Calculations]] in order to get it to do the actual
>> calculation. It looks like
>>
>> [StdWXCalculate]
>> [[Calculations]]
>> ...
>> rain = prefer_hardware
>>
>> ...
>> [[Delta]]
>> [[[rain]]]
>> input = dayRain
>>
>> On Sat, Jan 27, 2024 at 9:17 AM Remy Lavabre  wrote:
>>
>>> Hello Tom,
>>>
>>> I followed your instructions:
>>>
>>> 1/“rain” field present in the database
>>> 2/ “dayRain” field not present in the database
>>> 3/ My driver returns “dayRain” values and not “rain” values in the
>>> packetsloop
>>> 4/ [[Delta]] [[ [rain]]] input = dayRain added in weewx.conf (under
>>> [StdWXCalculate]).
>>>
>>> I did some tests : my driver returns 0.0 for dayRain but unfortunately
>>> the "rain" field in my database always remains NULL, even after several
>>> recordings in weewx.conf.
>>> Shouldn't "rain" field go to 0.0?
>>>
>>> THANKS
>>>
>>> Le vendredi 26 janvier 2024 à 22:48:03 UTC+1, Tom Keffer a écrit :
>>>
 If an observation type never gets reset to zero, you have two choices.
 1. Save the value. If you want to know daily use, take the difference
 of the value.
 2. Save the difference. That is, the change in the value over an
 archive period. If you want to know daily use, you would sum all the small
 deltas. This is like rain

 See the discussion *Accumulated vs delta energy
 *
  in
 the README of the Brultech driver for the pros and cons of the two
 approaches.

 It is not necessary to save "dayRain". WeeWX mostly uses "rain".
 Besides, as you note, it can always be calculated.



 On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre 
 wrote:

> And one more question
> Is it absolutely necessary to create a "dayRain" field in addition to
> the "rain" field in the weewx.sdb database?
> If the database only contains the [rain] field but the Weewx driver
> returns a "dayRain" field (cumulative rain over 24 hours since midnight)
> with a real value in each packetloop, the class [[Delta]] [[ [rain]]] 
> input
> = dayRain will it work??
> (the accumulation of rain since midnight is useless to me in a
> database field since it is easily calculated)
> Sorry for all the questions...and thanks again! ;-)
>
> Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :
>
>> Hello Tom and thank you for your response.
>>
>>  [StdWXCalculate]
>>  [[Calculations]]
>>  ...
>>  [[Delta]]
>>  [[[rain]]]
>>  input = dayRain
>>
>> This will calculate the rain difference between two records in weewx
>> sql based on the principle that the counter is reset to zero at midnight 
>> ->
>> PERFECT FOR THE RAIN 24H !
>>
>> Small additional question: if we wish to constantly calculate the
>> difference between two records values of a meter which *never*
>> resets to zero (such as an electricity or water meter), how should we
>> proceed?
>>
>> THANKS
>>
>> Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :
>>
>>> Unfortunately (for you), WeeWX mostly uses observation type "rain",
>>> the amount of rain that fell since the last loop packet (what you are
>>> calling "instantaneous rain").
>>>
>>> You should assign the rain since midnight to type "dayRain".
>>>
>>> Then calculate "rain" as the difference between successive
>>> "dayRain" values. While this is a pretty simple calculation, there is an
>>> xtype that can do it for you.  See class Delta in weewx.wxxtypes
>>> .
>>> To use it, add this to weewx.conf:
>>>
>>> [StdWXCalculate]
>>> [[Calculations]]
>>> ...
>>> [[Delta]]
>>> [[[rain]]]
>>> input = 

Re: [weewx-user] Integrate rain24 with Packetsloop

[Remy Lavabre]

thanks Tom,

I had thought about putting rain = prefer_software but as this type of rain 
configuration is not documented in the Weewx documentation (or at least I 
didn't find it!) I didn't take the initiative. .. stupid I am ! :-(

little suggestion Tom, perhaps it would be good to document this point in 
the [[Delta]] rain class? 
Well, not everyone is ignorant like me!! :-))
Many thanks to you for your help Tom

Le dimanche 28 janvier 2024 à 00:21:43 UTC+1, Tom Keffer a écrit :

> My apologies. I forgot one important detail. The "[Delta]" section tells 
> WeeWX how to calculate rain, but you also have to include "rain" under 
> [StdWXCalculations] / [[Calculations]] in order to get it to do the actual 
> calculation. It looks like
>
> [StdWXCalculate]
> [[Calculations]]
> ...
> rain = prefer_hardware
>
> ...
> [[Delta]]
> [[[rain]]]
> input = dayRain
>
> On Sat, Jan 27, 2024 at 9:17 AM Remy Lavabre  wrote:
>
>> Hello Tom,
>>
>> I followed your instructions:
>>
>> 1/“rain” field present in the database
>> 2/ “dayRain” field not present in the database
>> 3/ My driver returns “dayRain” values and not “rain” values in the 
>> packetsloop
>> 4/ [[Delta]] [[ [rain]]] input = dayRain added in weewx.conf (under 
>> [StdWXCalculate]).
>>
>> I did some tests : my driver returns 0.0 for dayRain but unfortunately 
>> the "rain" field in my database always remains NULL, even after several 
>> recordings in weewx.conf.
>> Shouldn't "rain" field go to 0.0?
>>
>> THANKS
>>
>> Le vendredi 26 janvier 2024 à 22:48:03 UTC+1, Tom Keffer a écrit :
>>
>>> If an observation type never gets reset to zero, you have two choices.
>>> 1. Save the value. If you want to know daily use, take the difference of 
>>> the value.
>>> 2. Save the difference. That is, the change in the value over an archive 
>>> period. If you want to know daily use, you would sum all the small deltas. 
>>> This is like rain
>>>
>>> See the discussion *Accumulated vs delta energy 
>>> *
>>>  in 
>>> the README of the Brultech driver for the pros and cons of the two 
>>> approaches.
>>>
>>> It is not necessary to save "dayRain". WeeWX mostly uses "rain". 
>>> Besides, as you note, it can always be calculated.
>>>
>>>
>>>
>>> On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre  
>>> wrote:
>>>
 And one more question
 Is it absolutely necessary to create a "dayRain" field in addition to 
 the "rain" field in the weewx.sdb database?
 If the database only contains the [rain] field but the Weewx driver 
 returns a "dayRain" field (cumulative rain over 24 hours since midnight) 
 with a real value in each packetloop, the class [[Delta]] [[ [rain]]] 
 input 
 = dayRain will it work??
 (the accumulation of rain since midnight is useless to me in a database 
 field since it is easily calculated)
 Sorry for all the questions...and thanks again! ;-)

 Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :

> Hello Tom and thank you for your response.
>
>  [StdWXCalculate]
>  [[Calculations]]
>  ...
>  [[Delta]]
>  [[[rain]]]
>  input = dayRain
>
> This will calculate the rain difference between two records in weewx 
> sql based on the principle that the counter is reset to zero at midnight 
> -> 
> PERFECT FOR THE RAIN 24H !
>
> Small additional question: if we wish to constantly calculate the 
> difference between two records values of a meter which *never* resets 
> to zero (such as an electricity or water meter), how should we proceed?
>
> THANKS
>
> Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :
>
>> Unfortunately (for you), WeeWX mostly uses observation type "rain", 
>> the amount of rain that fell since the last loop packet (what you are 
>> calling "instantaneous rain").
>>
>> You should assign the rain since midnight to type "dayRain".
>>
>> Then calculate "rain" as the difference between successive 
>> "dayRain" values. While this is a pretty simple calculation, there is an 
>> xtype that can do it for you.  See class Delta in weewx.wxxtypes 
>> . 
>> To use it, add this to weewx.conf:
>>
>> [StdWXCalculate]
>> [[Calculations]]
>> ...
>> [[Delta]]
>> [[[rain]]]
>> input = dayRain
>>
>>
>>
>>
>> On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre  
>> wrote:
>>
>>> Good morning,
>>>
>>> I created a [driver] for weewx to retrieve data from the Awekas API 
>>> (my Bresser weather station does not have a USB port).
>>>
>>> This works but regarding the 

Re: [weewx-user] Integrate rain24 with Packetsloop

[Tom Keffer]

My apologies. I forgot one important detail. The "[Delta]" section tells
WeeWX how to calculate rain, but you also have to include "rain" under
[StdWXCalculations] / [[Calculations]] in order to get it to do the actual
calculation. It looks like

[StdWXCalculate]
[[Calculations]]
...
rain = prefer_hardware
...
[[Delta]]
[[[rain]]]
input = dayRain



On Sat, Jan 27, 2024 at 9:17 AM Remy Lavabre  wrote:

> Hello Tom,
>
> I followed your instructions:
>
> 1/“rain” field present in the database
> 2/ “dayRain” field not present in the database
> 3/ My driver returns “dayRain” values and not “rain” values in the
> packetsloop
> 4/ [[Delta]] [[ [rain]]] input = dayRain added in weewx.conf (under
> [StdWXCalculate]).
>
> I did some tests : my driver returns 0.0 for dayRain but unfortunately the
> "rain" field in my database always remains NULL, even after several
> recordings in weewx.conf.
> Shouldn't "rain" field go to 0.0?
>
> THANKS
>
> Le vendredi 26 janvier 2024 à 22:48:03 UTC+1, Tom Keffer a écrit :
>
>> If an observation type never gets reset to zero, you have two choices.
>> 1. Save the value. If you want to know daily use, take the difference of
>> the value.
>> 2. Save the difference. That is, the change in the value over an archive
>> period. If you want to know daily use, you would sum all the small deltas.
>> This is like rain
>>
>> See the discussion *Accumulated vs delta energy
>> *
>>  in
>> the README of the Brultech driver for the pros and cons of the two
>> approaches.
>>
>> It is not necessary to save "dayRain". WeeWX mostly uses "rain". Besides,
>> as you note, it can always be calculated.
>>
>>
>>
>> On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre  wrote:
>>
>>> And one more question
>>> Is it absolutely necessary to create a "dayRain" field in addition to
>>> the "rain" field in the weewx.sdb database?
>>> If the database only contains the [rain] field but the Weewx driver
>>> returns a "dayRain" field (cumulative rain over 24 hours since midnight)
>>> with a real value in each packetloop, the class [[Delta]] [[ [rain]]] input
>>> = dayRain will it work??
>>> (the accumulation of rain since midnight is useless to me in a database
>>> field since it is easily calculated)
>>> Sorry for all the questions...and thanks again! ;-)
>>>
>>> Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :
>>>
 Hello Tom and thank you for your response.

  [StdWXCalculate]
  [[Calculations]]
  ...
  [[Delta]]
  [[[rain]]]
  input = dayRain

 This will calculate the rain difference between two records in weewx
 sql based on the principle that the counter is reset to zero at midnight ->
 PERFECT FOR THE RAIN 24H !

 Small additional question: if we wish to constantly calculate the
 difference between two records values of a meter which *never* resets
 to zero (such as an electricity or water meter), how should we proceed?

 THANKS

 Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :

> Unfortunately (for you), WeeWX mostly uses observation type "rain",
> the amount of rain that fell since the last loop packet (what you are
> calling "instantaneous rain").
>
> You should assign the rain since midnight to type "dayRain".
>
> Then calculate "rain" as the difference between successive
> "dayRain" values. While this is a pretty simple calculation, there is an
> xtype that can do it for you.  See class Delta in weewx.wxxtypes
> .
> To use it, add this to weewx.conf:
>
> [StdWXCalculate]
> [[Calculations]]
> ...
> [[Delta]]
> [[[rain]]]
> input = dayRain
>
>
>
>
> On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre 
> wrote:
>
>> Good morning,
>>
>> I created a [driver] for weewx to retrieve data from the Awekas API
>> (my Bresser weather station does not have a USB port).
>>
>> This works but regarding the rain, it is not the instantaneous rain
>> (from a packetloop) that we recover but the rain over 24 hours since
>> midnight.
>> Is there a "simple" way to tell WeeWX that the packetsloop rain data
>> corresponds to the cumulative rain since midnight and not the rain that
>> fell during the data retrieval interval (the time gap between two
>> packetsloops) ?
>>
>> Thank you so much...
>>
>> --
>> 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 

Re: [weewx-user] Integrate rain24 with Packetsloop

[Remy Lavabre]

Hello Tom,

I followed your instructions:

1/“rain” field present in the database
2/ “dayRain” field not present in the database
3/ My driver returns “dayRain” values and not “rain” values in the 
packetsloop
4/ [[Delta]] [[ [rain]]] input = dayRain added in weewx.conf (under 
[StdWXCalculate]).

I did some tests : my driver returns 0.0 for dayRain but unfortunately the 
"rain" field in my database always remains NULL, even after several 
recordings in weewx.conf.
Shouldn't "rain" field go to 0.0?

THANKS

Le vendredi 26 janvier 2024 à 22:48:03 UTC+1, Tom Keffer a écrit :

> If an observation type never gets reset to zero, you have two choices.
> 1. Save the value. If you want to know daily use, take the difference of 
> the value.
> 2. Save the difference. That is, the change in the value over an archive 
> period. If you want to know daily use, you would sum all the small deltas. 
> This is like rain
>
> See the discussion *Accumulated vs delta energy 
> *
>  in 
> the README of the Brultech driver for the pros and cons of the two 
> approaches.
>
> It is not necessary to save "dayRain". WeeWX mostly uses "rain". Besides, 
> as you note, it can always be calculated.
>
>
>
> On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre  wrote:
>
>> And one more question
>> Is it absolutely necessary to create a "dayRain" field in addition to the 
>> "rain" field in the weewx.sdb database?
>> If the database only contains the [rain] field but the Weewx driver 
>> returns a "dayRain" field (cumulative rain over 24 hours since midnight) 
>> with a real value in each packetloop, the class [[Delta]] [[ [rain]]] input 
>> = dayRain will it work??
>> (the accumulation of rain since midnight is useless to me in a database 
>> field since it is easily calculated)
>> Sorry for all the questions...and thanks again! ;-)
>>
>> Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :
>>
>>> Hello Tom and thank you for your response.
>>>
>>>  [StdWXCalculate]
>>>  [[Calculations]]
>>>  ...
>>>  [[Delta]]
>>>  [[[rain]]]
>>>  input = dayRain
>>>
>>> This will calculate the rain difference between two records in weewx sql 
>>> based on the principle that the counter is reset to zero at midnight -> 
>>> PERFECT FOR THE RAIN 24H !
>>>
>>> Small additional question: if we wish to constantly calculate the 
>>> difference between two records values of a meter which *never* resets 
>>> to zero (such as an electricity or water meter), how should we proceed?
>>>
>>> THANKS
>>>
>>> Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :
>>>
 Unfortunately (for you), WeeWX mostly uses observation type "rain", the 
 amount of rain that fell since the last loop packet (what you are calling 
 "instantaneous rain").

 You should assign the rain since midnight to type "dayRain".

 Then calculate "rain" as the difference between successive 
 "dayRain" values. While this is a pretty simple calculation, there is an 
 xtype that can do it for you.  See class Delta in weewx.wxxtypes 
 . 
 To use it, add this to weewx.conf:

 [StdWXCalculate]
 [[Calculations]]
 ...
 [[Delta]]
 [[[rain]]]
 input = dayRain




 On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre  
 wrote:

> Good morning,
>
> I created a [driver] for weewx to retrieve data from the Awekas API 
> (my Bresser weather station does not have a USB port).
>
> This works but regarding the rain, it is not the instantaneous rain 
> (from a packetloop) that we recover but the rain over 24 hours since 
> midnight.
> Is there a "simple" way to tell WeeWX that the packetsloop rain data 
> corresponds to the cumulative rain since midnight and not the rain that 
> fell during the data retrieval interval (the time gap between two 
> packetsloops) ?
>
> Thank you so much...
>
> -- 
> 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-user+...@googlegroups.com.
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/weewx-user/9887101f-fcc1-45ce-948e-e03429bf7baan%40googlegroups.com
>  
> 
> .
>
 -- 
>> 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-user+...@googlegroups.com.

Re: [weewx-user] Integrate rain24 with Packetsloop

[Tom Keffer]

If an observation type never gets reset to zero, you have two choices.
1. Save the value. If you want to know daily use, take the difference of
the value.
2. Save the difference. That is, the change in the value over an archive
period. If you want to know daily use, you would sum all the small deltas.
This is like rain

See the discussion *Accumulated vs delta energy
*
in
the README of the Brultech driver for the pros and cons of the two
approaches.

It is not necessary to save "dayRain". WeeWX mostly uses "rain". Besides,
as you note, it can always be calculated.



On Fri, Jan 26, 2024 at 7:06 AM Remy Lavabre  wrote:

> And one more question
> Is it absolutely necessary to create a "dayRain" field in addition to the
> "rain" field in the weewx.sdb database?
> If the database only contains the [rain] field but the Weewx driver
> returns a "dayRain" field (cumulative rain over 24 hours since midnight)
> with a real value in each packetloop, the class [[Delta]] [[ [rain]]] input
> = dayRain will it work??
> (the accumulation of rain since midnight is useless to me in a database
> field since it is easily calculated)
> Sorry for all the questions...and thanks again! ;-)
>
> Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :
>
>> Hello Tom and thank you for your response.
>>
>>  [StdWXCalculate]
>>  [[Calculations]]
>>  ...
>>  [[Delta]]
>>  [[[rain]]]
>>  input = dayRain
>>
>> This will calculate the rain difference between two records in weewx sql
>> based on the principle that the counter is reset to zero at midnight ->
>> PERFECT FOR THE RAIN 24H !
>>
>> Small additional question: if we wish to constantly calculate the
>> difference between two records values of a meter which *never* resets to
>> zero (such as an electricity or water meter), how should we proceed?
>>
>> THANKS
>>
>> Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :
>>
>>> Unfortunately (for you), WeeWX mostly uses observation type "rain", the
>>> amount of rain that fell since the last loop packet (what you are calling
>>> "instantaneous rain").
>>>
>>> You should assign the rain since midnight to type "dayRain".
>>>
>>> Then calculate "rain" as the difference between successive
>>> "dayRain" values. While this is a pretty simple calculation, there is an
>>> xtype that can do it for you.  See class Delta in weewx.wxxtypes
>>> .
>>> To use it, add this to weewx.conf:
>>>
>>> [StdWXCalculate]
>>> [[Calculations]]
>>> ...
>>> [[Delta]]
>>> [[[rain]]]
>>> input = dayRain
>>>
>>>
>>>
>>>
>>> On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre 
>>> wrote:
>>>
 Good morning,

 I created a [driver] for weewx to retrieve data from the Awekas API (my
 Bresser weather station does not have a USB port).

 This works but regarding the rain, it is not the instantaneous rain
 (from a packetloop) that we recover but the rain over 24 hours since
 midnight.
 Is there a "simple" way to tell WeeWX that the packetsloop rain data
 corresponds to the cumulative rain since midnight and not the rain that
 fell during the data retrieval interval (the time gap between two
 packetsloops) ?

 Thank you so much...

 --
 You received this message because you are subscribed to the Google
 Groups "weewx-user" group.
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Re: [weewx-user] Integrate rain24 with Packetsloop

[Remy Lavabre]

And one more question
Is it absolutely necessary to create a "dayRain" field in addition to the 
"rain" field in the weewx.sdb database?
If the database only contains the [rain] field but the Weewx driver returns 
a "dayRain" field (cumulative rain over 24 hours since midnight) with a 
real value in each packetloop, the class [[Delta]] [[ [rain]]] input = 
dayRain will it work??
(the accumulation of rain since midnight is useless to me in a database 
field since it is easily calculated)
Sorry for all the questions...and thanks again! ;-)

Le vendredi 26 janvier 2024 à 15:46:04 UTC+1, Remy Lavabre a écrit :

> Hello Tom and thank you for your response.
>
>  [StdWXCalculate]
>  [[Calculations]]
>  ...
>  [[Delta]]
>  [[[rain]]]
>  input = dayRain
>
> This will calculate the rain difference between two records in weewx sql 
> based on the principle that the counter is reset to zero at midnight -> 
> PERFECT FOR THE RAIN 24H !
>
> Small additional question: if we wish to constantly calculate the 
> difference between two records values of a meter which *never* resets to 
> zero (such as an electricity or water meter), how should we proceed?
>
> THANKS
>
> Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :
>
>> Unfortunately (for you), WeeWX mostly uses observation type "rain", the 
>> amount of rain that fell since the last loop packet (what you are calling 
>> "instantaneous rain").
>>
>> You should assign the rain since midnight to type "dayRain".
>>
>> Then calculate "rain" as the difference between successive 
>> "dayRain" values. While this is a pretty simple calculation, there is an 
>> xtype that can do it for you.  See class Delta in weewx.wxxtypes 
>> . 
>> To use it, add this to weewx.conf:
>>
>> [StdWXCalculate]
>> [[Calculations]]
>> ...
>> [[Delta]]
>> [[[rain]]]
>> input = dayRain
>>
>>
>>
>>
>> On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre  
>> wrote:
>>
>>> Good morning,
>>>
>>> I created a [driver] for weewx to retrieve data from the Awekas API (my 
>>> Bresser weather station does not have a USB port).
>>>
>>> This works but regarding the rain, it is not the instantaneous rain 
>>> (from a packetloop) that we recover but the rain over 24 hours since 
>>> midnight.
>>> Is there a "simple" way to tell WeeWX that the packetsloop rain data 
>>> corresponds to the cumulative rain since midnight and not the rain that 
>>> fell during the data retrieval interval (the time gap between two 
>>> packetsloops) ?
>>>
>>> Thank you so much...
>>>
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>>>  
>>> 
>>> .
>>>
>>

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Re: [weewx-user] Integrate rain24 with Packetsloop

[Remy Lavabre]

Hello Tom and thank you for your response.

 [StdWXCalculate]
 [[Calculations]]
 ...
 [[Delta]]
 [[[rain]]]
 input = dayRain

This will calculate the rain difference between two records in weewx sql 
based on the principle that the counter is reset to zero at midnight -> 
PERFECT FOR THE RAIN 24H !

Small additional question: if we wish to constantly calculate the 
difference between two records values of a meter which *never* resets to 
zero (such as an electricity or water meter), how should we proceed?

THANKS

Le jeudi 18 janvier 2024 à 14:05:10 UTC+1, Tom Keffer a écrit :

> Unfortunately (for you), WeeWX mostly uses observation type "rain", the 
> amount of rain that fell since the last loop packet (what you are calling 
> "instantaneous rain").
>
> You should assign the rain since midnight to type "dayRain".
>
> Then calculate "rain" as the difference between successive 
> "dayRain" values. While this is a pretty simple calculation, there is an 
> xtype that can do it for you.  See class Delta in weewx.wxxtypes 
> . 
> To use it, add this to weewx.conf:
>
> [StdWXCalculate]
> [[Calculations]]
> ...
> [[Delta]]
> [[[rain]]]
> input = dayRain
>
>
>
>
> On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre  wrote:
>
>> Good morning,
>>
>> I created a [driver] for weewx to retrieve data from the Awekas API (my 
>> Bresser weather station does not have a USB port).
>>
>> This works but regarding the rain, it is not the instantaneous rain (from 
>> a packetloop) that we recover but the rain over 24 hours since midnight.
>> Is there a "simple" way to tell WeeWX that the packetsloop rain data 
>> corresponds to the cumulative rain since midnight and not the rain that 
>> fell during the data retrieval interval (the time gap between two 
>> packetsloops) ?
>>
>> Thank you so much...
>>
>> -- 
>> 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-user+...@googlegroups.com.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/weewx-user/9887101f-fcc1-45ce-948e-e03429bf7baan%40googlegroups.com
>>  
>> 
>> .
>>
>

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Re: [weewx-user] Integrate rain24 with Packetsloop

[Tom Keffer]

Unfortunately (for you), WeeWX mostly uses observation type "rain", the
amount of rain that fell since the last loop packet (what you are calling
"instantaneous rain").

You should assign the rain since midnight to type "dayRain".

Then calculate "rain" as the difference between successive
"dayRain" values. While this is a pretty simple calculation, there is an
xtype that can do it for you.  See class Delta in weewx.wxxtypes
. To
use it, add this to weewx.conf:

[StdWXCalculate]
[[Calculations]]
...
[[Delta]]
[[[rain]]]
input = dayRain




On Wed, Jan 17, 2024 at 11:47 PM Remy Lavabre 
wrote:

> Good morning,
>
> I created a [driver] for weewx to retrieve data from the Awekas API (my
> Bresser weather station does not have a USB port).
>
> This works but regarding the rain, it is not the instantaneous rain (from
> a packetloop) that we recover but the rain over 24 hours since midnight.
> Is there a "simple" way to tell WeeWX that the packetsloop rain data
> corresponds to the cumulative rain since midnight and not the rain that
> fell during the data retrieval interval (the time gap between two
> packetsloops) ?
>
> Thank you so much...
>
> --
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> 
> .
>

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