I did a similar project at my home & I dare say it is safer, though technically much uglier. It consists of a Raspberry Pi with a PiFace Digital board (with rel

I did a similar project at my home & I dare say it is safer, though technically much uglier. It consists of a Raspberry Pi with a PiFace Digital board (with relays). The relays don't drive the motor directly: it "pushes" (shorts/connects) the manual open/close button on the garage door's system board.