To operate my garage door I currently use a bell push button. This shorts two wires together, there is no voltage on these wires so could I programme 2x GPIO pins to short together for a second to simulate the action of the bell button?
How did you test to see no voltage? If you tested across the press switch you wouldn't see a voltage.
Most likely the switch is a "Clean Contact" so interrupts/makes a circuit depending on the system, so the voltage could be 12vdc or even higher which will kill the Pi.
As already suggested look at a relay module suitable for use with the PI, 3.3vdc control.
You will also need to read up on how to connect the phone to the PI, are you looking at local control (drive up, press a button on the phone and the door opens) or are you looking at being able to open the door when you are further away?
The interface between the Pi and the door is quite easy, just a few lines of code BUT the Phone to Pi connection will require some more thought.
Good luck and please let us know how you get on.
Statistics: Posted by Kiwi_bloke — Tue Jan 02, 2024 11:55 pm