[App_rpt-users] UPS for a PI 3 B+

[Tom Hayward]

I went a bit different direction to solve this problem. I already have a
12V power system with battery backup, so I decided to run the Pi from that.
I used the SleepyPi https://spellfoundry.com/product/sleepy-pi-2/ to safely
shutdown the Pi when the battery voltage drops below the threshold I
programmed. When the voltage recovers above another (higher) threshold, it
boots up again. I can also read the current voltage over serial for
logging, alerting, etc.

Here is the code I wrote to do it:
https://github.com/SpellFoundry/SleepyPi2/blob/master/examples/LowVoltageShutdown/LowVoltageShutdown.ino

If you have a slightly different application, you could modify the code to
suit it.

Tom KD7LXL
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