Welcome to my first Instructable!
I've been learning more and more about home automation and have opted to use z-wave devices for most of my system. With the addition of the SQ Blaster and SQ Remote iPad app I've been able to make a wonderful remote control system for my home.
The garage door opener became a bit more of an urgent issue recently when a neighbor called and told me that my garage door had been left open all day. With this project in combination with a door/window sensor I'll be able to keep myself apprised of such oversights in the future and be able to take care of it from anywhere in the world!
Giving credit where credit's due:
Please note that this concept was not my original idea. I Googled "z-wave garage door opener" and came across a video of someone else's very similar concoction. My only contribution is making this instructalbe and using my electromechanical experience to streamline the final device.
I accept no responsibility for any damages to persons or property caused by following this Instructable. Please use caution any time you handle soldering irons, interact with high voltages and climb ladders! ;-)
Z-wave plug-in appliance switch (I used an Intermatic HA02C, $27 on eBay)
120v relay (I used Radio Shack model #275-217, $9)
Project Enclosure (I used Radio Shack model 270-1801, $3)
Power cord (Mine was cut off a dead fan)
Approx. 3' of 2-conductor wire (any small guage, 20-26AWG, will do)
Double-sided foam tape
Z-wave door/window sensor to indicate DOOR CLOSED state (not shown in this instructable).
I've purchased a few "Aeon Labs Z-Wave Magnetic Door / Window Sensors" from eBay (not yet received).
As most garage doors are metallic and I've read that the metals often interfere with the reliability of the magnetic properties of the sensor, I'll be mounting my sensor and it's triggering magnet to plexiglas brackets mounted to the door and rails to lift it away from the ferrous metals. I just wanted to pass on this tip to save you some troubleshooting time in case you come across this problem in your own implementation.
Step 1: Building It...
As you can see, the assembly is very straightforward.
I drilled two small holes in the side of the box and used an x-acto knife to cut the holes into an oval shaped like the power cord so it would fit with precision.
The power cord was cut short enough to eliminate excess wire dangling from the final assembly but long enough to keep the wire from being too tight.
Feed the power cord through the hole, then split the strands (or strip back the jacket of you use a jacketed cord) about 1" from the end. Strip the conductors about 1/4" and tin with solder. Solder the conductors across the relay coil. (If you're unfamiliar with relays, don't worry about polarity. As this is AC and coils are not polarized you can connect in any order.)
Drill a small hole in the lid of the box and feed through your smaller remote wire. As with the power cord, split the conductors about 1", strip 1/4" and tin. Solder across the Normally Open (NO) contacts. This relay has two sets of contacts and it doesn't matter which one you use.
Depending on the type of connections your garage door opener uses you'll likely want to prepare the other end of the remote wires at this point. Split the conductors back about 3", strip back about 1/2" and tin the wire ends to facilitate connection to your garage door opener terminals.
Use a piece of double-sided foam tape to adhere the relay to the bottom of the box and another piece of foam tape to adhere the box to the z-wave appliance switch.