Comment by twothamendment

I recently soldered a wire to my garage door opener on the wall and ran it to a relay and then to the pins on a raspberry pi. Knowing the state of the door is key because the opener is just a toggle. I also have my alarm system hooked up to the pi, so it checks the state before and after any request. Repeatedly asking it to open will open it, or return success of it already is. Same with close.

It took a bit of testing before I trusted it would all work the way I thought it would, but now I user it and don't even think about it, it just works and is handy to have.