I am looking for a way to interface a backup camera so that when the car is in reverse it will automatically go to the backup cam screen. I know how to wire it into the car (pretty easy actually) just need to hook it into the backup lamp wire. But what is an easy and fairly inexpensive way (I.E. No phidgets since a solution would be like $100+ probably) to have the computer determine when the circuit is turned on so that it can activate the backup cam.
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Auto activate backup camera