Originally Posted by Ryan Cordero
Any other 7 inch tablets put there we could use? My nexus 7 is so slow and always dying.
The Nvidia Shield Tablet is a good candidate, it's 8" though.
It has OTG-Charging support out of the box from Nvidia, it does, however, have some quirks.
.. I read a lot of bad reviews, people RMAing them for bad batteries and plastic edges that crack up on their own
Another quirk I read about is that in order to enable the OTG-charging if the tablet was off and you turn it back on with an OTG cable still plugged into it you have to unplug and re-plug it to enable the host-mode charging again. That one would cause trouble with our setups, unless you felt like unplugging the cable from your tablet every time you start the car. You could custom make your own cable and wire a FET across the ID and GND pins from source to drain for the OTG cable and give it +5V from your +5V that comes to the tablet on the gate. That way when you turn off the car it'll disable the OTG mode on the cable and when you turn it on it'll re-enable it so the tablet will think you unplugged and re-plugged the OTG cable and should start charging. You'd have to use a break-out-board from a robotics supply shop to do it, I was thinking about it but I'm holding out for the Nexus 9 to see if they make an OTG charging kernel for that tablet later on, otherwise I might have already started testing with a shield tablet.