Even though I’ve used an iPhone for this ‘ible, you could use any smartphone, tablet or other computing device with an Internet connection. As a bonus feature, you can cache the HTML App on your iPhone so that it appears and runs just like a real App Store app, without needing to jump through app distribution hoops or Apple Developer program registration. The smartphone has become an indispensable attachment - most people will never leave home without it, and most people I know can no longer conduct a conversation without checking their phones repeatedly. Tighter integration would require surgery but that is some way out in the future. The net result is that you always have a garage door opener on your person.
The Electric Imp is a fantastic device that enables WiFi control of anything and everything. With a small amount of effort, you can control anything you want with your smartphone, web browser or other Internet enabled device.
To complete this project, we will assemble electronics, write firmware, and develop an HTML App for controlling the garage door. This project interfaces to your existing electric garage door opener via the pushbutton switch that you normally use to open the door. If you have a manual garage door, you are out of luck on the automation side, but will still learn a bit about the Imp, and about creating an HTML App for your phone. After completion of the project, you will be able to use either the pushbutton switch or your smartphone to open the door – all existing garage door opener functionality is maintained.
I do get that opening the garage door from your phone is hardly novel. Someone has most likely cobbled together a steam punk version from scrap parts discovered in a dumpster in some far away country! However, this is my version that answers Imp related questions that appear frequently on forums like “how do I control my imp from a web browser”, or “how do I add a relay to my imp” or “how do I create an html app for my phone?” or “how do I get data from the Imp back to my phone” etc.
I finally have a ready made board to support this project available at http://www.mihomeagent.net