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I recently finished the prototype for a battery powered ESP8266 based temperature and humidity sensor with eInk display. Currently working on a custom PCB. : r/arduino
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coin-cell (CR2032) powered temperature sensor | MySensors Forum
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LILYGO®TTGO T Higrow ESP32 WiFi And Bluetooth Battery / DHT11 Soil Temperature BEM280 Humidity Photometric Electrolyte Sensor|temperature and humidity sensor|temperature and humiditybatteries batteries - AliExpress
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Single CR2032 / 20mm Coin Cell Battery Holder with Switch : ID 4856 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Build an Arduino Multi-Node BLE Humidity and Temperature Sensor Monitor - Projects
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