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 >> <https://github.com/weewx/weewx/blob/master/src/weewx/wxxtypes.py#L586>. >> 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 <remy.l...@gmail.com> >> 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 >>> >>> <https://groups.google.com/d/msgid/weewx-user/9887101f-fcc1-45ce-948e-e03429bf7baan%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- 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+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/796eb84f-ad09-41bf-ad90-202ad6f05773n%40googlegroups.com.
