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I successfully run DHT22 battery ESP8266 temperature/humidity IoT sensor so my next project is a simple IoT Door Sensor. It is up and running … | Iot, Sensor, Power
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ESP8266 Voltage Regulator (LiPo and Li-ion Batteries)
Battery Powered ESP8266 IoT - Temperature Sensor - Home Circuits
Battery Powered ESP8266 WiFi Temperature and Humidity Logger
DIY: Cheap wifi-based temperature/humidity sensor based on ESP8266 & DHT22 - Home Automation - openHAB Community
