Internet Of Things “DIY” Door Sensor

http://electronicsofthings.com/expert-opinion/door-sensor/?utm_source=eotpage&utm_medium=eotpage&utm_campaign=eotpage&utm_content=eotposts

This is a home automation IoT door sensor project based on ESP8266 NodeMcu module. This IoT device sends notification to your smart phone when door changes state (opens or closes). This could be useful for other applications also  - for example connect to some alarm sensor…

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