I had also thought if I used 5.5v across my circuit I would break the Raspberry Pi. (fry the procesor, or so I am told.) i tried reading input like this. import RPi.GPIO as io io.setmode(io.BCM) io.setup(4, io.in) input_value = io.input(4) while True: print "--" + str(input_value) that gave me a lon...