to control my garage door opener. When I received it, I realized that it passes power though it. This won't work for your garage door opener. You'll need to modify the Sonoff Wifi switch. If you haven't already done this, please start with my article on How to Convert a WIFI Sonoff into a Dry Contact. If you don't, you'll most likely fry you r garage door opener.
Step 1: Start by making sure that your garage door will support being closed with a simple contact. Most garage door openers will support this but I have heard of a few that use encoded buttons for the wall. Most garage door openers just have a momentary button that closes a contact when depressed. Our modified Sonoff will do the same thing. You can test this by using a wire to jump the terminals on your garage door opener between COM and WALL or something to that effect. You may need to find your manual if it is not readily apparent. You're looking for the wires that go to your wall switch.
Step 2: Connect your Converted WIFI Sonoff Switch on the dry contact side to your terminals that you found in Step 1.
Step 3: Connect your power to the left terminals on the Sonoff and plug in your device.
Step 4: Test your unit. Make sure to always turn the unit back off after activating or your garage door will not work from any other source. This is a downside since the app that Sonoff uses is eWeLink and it doesn't support momentary operation. The manufacturer said it may come down the line but it's not here yet. You can now control your garage door with your Sonoff from anywhere in the world that you have internet.
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