Dear electrical engineers,
I had the idea of hooking up a garage door to a raspberry pi. The remote hasn't worked for years. To test out this would work, I simply bridged the two wires coming out of the white knob (see pictures), and that engaged the motor. So that looked simply enough. Get raspberry pi, get relay, hook it up, done. In test setup all working. Time to get a plastic box and wire it up properly.
Unfortunately something weird happened: just bridging the two wires coming out of the know does no longer work! Connecting it to the relay doesn't work either. But the knob still works, just touch that and the motor still starts.
I'm quite at a loss what's happening here, so hopefully someone can tell me what to do next, or why bridging the wires doesn't work anymore (I thought that was all this knob did basically!).
Have attached three images:
- exhibit 1: the knob, with wires just attached.
- exhibit 2: the circuit board, with the knob attached to the board.
- exhibit 3: wires leading to the raspberry pi + relay.