On the garage-end of my garage-door-opener, I need a relay that’s controlled by the wireless key. The relay should be on for a second or less, and this triggers the garage door opener to either open or close the door. I’ve now made this component using a MSP430 Launchpad with a CC2500 Boosterpack on it. The relay is a relay board from Dealextreme. I’m using the 5V holes just next to the USB connector on the Launchpad to feed the +/- on the relay, and an MCU pin to feed the control signal.
I’ve also ordered a bluetooth module from Dealextreme (I have one in my lab, but can’t find it), which I’ll use to implement a smart-phone-app that opens the garage door.