PI-JUICE

[Bgardner_83]

I am very new to this but has anyone used a pi-juice hat to control the shutdown? I just got one and so far it seems to be a good shutdown solution. It has it's own microprocessor and monitors it's own onboard battery. It has settings that will shut down the pi at a percentage that you can set. The battery that comes with it keeps my pi and touch screen running for about 2 hours.

[skrimo]

If you like the results then stick with it.

[Chrisfromwa]

sounds interesting. maybe take up less space.
when you shut your car off, do you have a script that shuts off the pi after a few minutes?

[sonicxtacy02]

never heard of this but i'm extremely interested. Does this automatically handle shutdown duties? I have a graceful shutdown option installed, but every time i update OAP I have to reconfigure it.

[Bgardner_83]

This is the web site. https://uk.pi-supply.com/products/pijuice-standard
I got mine here. https://www.ebay.com/itm/PiJuice-HAT/223588500557?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
I don't have a script for the shut down other than the operation that is built into the pi-juice.

[Chrisfromwa]

so currently when you shut off the car, does it just stay on until the battery dies?
When you start the car, does it automatically startup?

[Bgardner_83]

Right now I am shutting it down before I leave, however, I don't have to wait to shut the car off. When I start the car the pi starts up. There are settings that I haven't yet explored where I won't have to manually shut it down.

[Hisma]

I would not use this unless you live somewhere cold.

Lithium ion batteries are not designed for use in harsh environments like the inside of a car baking in the sun.
The label on the battery actually reads "do not expose to high temperature (140F/60C)". Take into account that it's sitting above a rpi that's already generating enough heat of its own.

I would instead look at a super-capacitor solution if you really want an onboard UPS.

[Bgardner_83]

Well I live in Washington. It doesn't get very hot or cold here, just wet. I do plan to have a cooling fan.

[oliverisss]

In case anyone is using or planning to use PiJuice Hat there is tutorial of custom script that will turn your pi off when not charging and will turn on when charging. Great for AOP project in the car.

How to run a user script with the PiJuice power events