I'm looking to use an Android tablet as a carputer, yet one problem I have is how to get the tablet to turn on and off when I turn my car on and off. With most carputers people will use special automotive power supplies to solve this problem.
What I want to know is if there is any way I can simulate pressing the power button, but through one of the wired interfaces such as the USB connection? Or would my only option be to open up whatever tablet use up and solder extension leads to the power button contacts, and then figure out some way to simulate a power button press when my car starts?