How to DIY a low cost smart door lock (2016) 

DIY a smart door lock (for home, garage, warehouse, etc) is a very interesting project. It’s easy and it’ll cost you a little money. All you need is a cheap electromagnetic lock, a power plug, and a low cost Sonoff SV, which is Wireless smart switch that supports 5-24V power supply. It can turn your door lock into a smart WiFi door lock.
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