I'm not the authority here, but I get the principle....Originally Posted by live2themaxuk
But you'd basically tie the backup light to a specific pin on a serial connector (I don't know the pinout for the serial port, so I don't know which one). When you shift into reverse, the backup lights come on and power goes to that specific pin.
FrodoPlayer detects that trigger and launches the cam application so you can see behind you without having to do anything other than put your car in reverse.
Someone else help the man out with the pin-out for a serial port to accomplish this.