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ESP8266 Controlling 4 RelaysView Instructable »
ESP8266 Door/window Sensor ...View Instructable »
hi, here you have more tutorials:http://iot-playground.com/build
yes, look at this link:http://iot-playground.com/blog/2-uncategorised/10-low-power-door-window-sensor
I guess yes. Use 3,3V relay.
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