Tablet car mount - Turning on and off automatically
I'm currently planning to mount a Archos 5 Tablet PC into my car. The 5" fits very well onto the stock mobile phone deck. The audio is transmitted via normal Aux-in. My only problem is the powering. At the moment I thought of two possibilites:
1. Connecting the tablet power to the ignition switched car power. The advantage is, that it will only charge when the key is turned, so the car battery will never drain. The screen could be switched on and off via the power switch event with an app like Llama. The disadvantage is that the tablet will not be charged when the car is not started. So after a few days without driving it has to be switched on again manually. Plus the Archos needs a long time to charge via USB.
2. The power of the tablet is connected to the permanent car power. Then the tablet pc will be available all the time. I guess the power consumption is low enough that the car battery drainage will not be a problem. Now my problem: How do I switch the screen on and off automatically in this scenario?
Thxs and greetings