This video will show you how I use Sonoff SV (save voltage) to control my garage door from my phone. I can control my garage door from anywhere in the world! The modification is quite simple and best of all it is cheap, all of this only cost $8 in materials. You can buy the sonoff from the link below:
https://amzn.to/2RmEus9
I bought mine directly from China as a pack of 6, that is why mine is $8 each only.
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