11months on battery at 87%... still working!
palmerfarmer
Posts
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My 2AA battery sensor -
Clock Sketch (RTC) modified for 1.8" LCDThanks for the speedy reply, I owe you a beer! works perfectly.

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My 2AA battery sensorI got it from CPC in the UK which are owned by Farnell
https://cpc.farnell.com/hammond/1593qgy/case-with-bat-compart-110x66x28mm/dp/EN82140
You may have to make a slight mod to the board or enclosure to make it fit.
good luck -
Multiple BME280 sensor for DomoticzThanks for the reply and spotting one of my many errors (now corrected amongst others!).
Managed to get one of them showing up in Domoticz, lets see if i can get them both in there without the temp hum being crossed over between physical sensors. There seems to be a few posts about this problem. -
Home Assistant Serial Gateway with Supply rail monitoringThanks for the quick response, I have removed the second V_VOLTAGE and added the .0 to the sensorValue line, this did not fix the problem. I took your advice and serial printed the lastVolt, batteryVolt and sensorValue. I need to work out why but the lastVolt reading is correct so i have sent 'send(msgVolt.set(lastVolt, 2)); ' this to the gateway and this now works. Need to think about this a but more. By the way that parsor is really useful i never knew it existed. Thanks for all your suggestions!