tim0001:

 

Silvrav:

 

I am also looking at hard wired options as a ESP in a battery nit will severely drain the battery, even in sleep mode.

 

 

 

 

Running a esp8266 on a 9v battery has its challenges, but I haven't ruled it out yet because other people seem to have pulled it off.  A bare bones esp-12 module and low quiescent current regulator draw around 20uA in deep sleep.  An esp32s might also be worth looking into.  But before I go down that route, I was hoping to find out more about the Aliexpress Tuya alarms.  (Also, the Cavius option mentioned by dasimpsonsrule sounds interesting)

 

aa thanks for the linK! that looks awesome. Yip it is a challenge indeed. I run 3 D1's on my vehicles to monitor battery levels, so something like this is quite achievable. I will do some calcs to see battery drain over time.

I have about 3 of these: