Using a Xiaomi temperature sensor for presence?

[marktheknife (Mark)]

@docfx If battery is the major sticking point for you, take a look at what others have done to wire the presence sensor to an alternate power source. This does make it much less portable, but if putting it in the car of the person that you want to track their arrival is a reasonable option, then it could work.

Presence Sensor battery upgrade

Soooo, I’m supper annoyed with the presence sensor battery life… so this is what I’m doing. Since a CR2032 battery is 3v and ~240mah I figured I could take two AA batteries in series to get 3v and 1900mah capacity. HUGE difference! about 8x the capacity of a 2032 battery setup. I purchased a few battery cases with leads and project boxes. I’ve already made one for my motorcycle and popped it under the seat. So far, so good. I just want it to last more than 3 months! If the increase in compaticence is even a lowly 50% efficiency gain, which I am guessing it’s far more than that… the thing should last more than a year. If the efficiency is closer to 100% then I can probably expect 2 years out of this thing. I plan on making 2 more for my car and my wife’s car. What I do is set up …