I have found a 5V motor from the steering of a rc car now. I think this has limit switches, as it just turns a total of 0,75 turns in each direction. So, what I have is that motor and two 12v currents. One will only give power when ignition is on, and the other will give power no matter what state the ignition is in. I guess I can use the ignition controlled current as signal, and the other current for power. But how do I invert the polarity of the current when ignition is turned off? And what should I use to go from 12v to 5v? Any regulator?
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