Hi! I’m currently trying to add my existing ‘dumb’ home alarm system to HA by means of my Pi3’s GPIO.
I’ve added a Waveshare Pi relay board hat and added the three relay outputs through the GPIO into HA and created scripts for each function to simulate 1.0sec button presses. I have ARM, DISARM and my garage door opener has been added to a third button on the key fob, so the third relay will go towards that.
My plan is to wire these outputs to each button of a 433MHz key fob that is part of the alarm system. This key fob has frequency hopping so I figured this would be the best way to add the system to HA. I will eventually create automations based on presence detection, etc.
Has anyone done this before? Is there perhaps a better way to go about this retrofit? Also, the key fob takes a single CR2032 battery - can anyone confirm I can power the key fob directly off the 3.3v rail from the Pi to negate the need for the battery?
Any suggestions appreciated, thanks in advance!