Running the tablet only when the car is running

Hi all,

First post here to get some ideas on setting up a game plan to build a head unit out of a tablet.

I'm trying to figure out a way to have the tablet shut down (not sleep) when the car is stopped and have it boot up when the car starts.

Coming from an island near the equator, it gets extremely hot here and the cabin heats up when parked outside like you wouldn't believe. So I'm trying to ditch the tablet battery as well. I've seen the hack using the battery PCB to directly send power to the tablet which would solve this problem.

Why I want to shut the tablet down completely is out of worry that it may wake up due to a temp warning (since the temp sensor is still intact) or some other error and will start draining the car's battery. And if I have it permanently running (directly wired to the battery) it can't be good for the tablet itself to have it run round-the-clock right?

The solution I can think of is to;

Wire the tablet's power to the ACC wire,

Wire an external push button to the tablet's power button and mount the button on the dash.

Push the button to power the tablet on after starting the car and remember to shut down the tablet before turning the car off.

This is not exactly hassle free. Do you have any ideas on how to go around this issue?

Thanks.

Feb 3, 2016 18:57:06 GMT Admin said:

Right, so there is a way to start the tablet from off when it senses charging, so there is no need for an external power button, and to power it down you can set a task in whatever tasker app you use to power off when not charging (i.e. turning the ignition off and therefore removing power from the charging port, this will work even if you remove the battery)/

To power on when the N7 senses power to the charging port type "fastboot oem off-mode-charge 0" in terminal - instructions here .. make sure you read them and read them again, www.gencoupe.com/interior/126356-power-nexus-7-without-pressing-power-button-no-kernel-required.html (you may need this download link for r3: Superboot loadbalancing.modaco.com/download.php?file=r4-nexus7-superboot.zip

There is an app that I use that you can set to either sleep the N7 or power down when the charger power is removed, this could be another option instead of tasker to power down. play.google.com/store/apps/details?id=com.as.powerchecker

Hey thanks, that sorts out a heap of issues. I'll make sure I read though the instructions for the boot up part.

Basically, I can have two power adapters. One wired to the "always hot" circuit of the car, through the tablet battery's PCB. And the other wired to the +12 ACC circuit to trigger the tablet through the OTG cable.

Thanks!