pi_power - power management for portable Raspberry Pi projects

I have been working on a portable Raspberry Pi project for a while - still not there yet but I've completed one important piece.

It's portable so it obviously has a battery. The Pi takes quite a bit of power so it needed to be rechargeable and include a charger. Adafruit make a great device called the PowerBoost 1000C which takes care of the core charging and power supply functions. But I really wanted my project to work like my phone does:

To power it up from a cold state, press a button for a few seconds

To power it off, press the same button for a few seconds

Indicate how much power remains in the battery

Provide an alert when that is running really low

Shut down safely without any data corruption if the battery does run out

To recharge the battery, just plug in a cable from a USB charger

I couldn't find anything that provided all the functionality I wanted - so I built my own

pi_power consists of fairly straightforward circuitry that links the PowerBoost to the Pi in conjunction with two python scripts that run in the background and monitor the battery voltage.

If you are building a portable RasPi project then you might want to take a look

https://github.com/craic/pi_power