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ESP8266 + BME/BMP 280 low power board powered by two AA cells
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ESP8266 ultra low power thermometer

see the article here A picture of the finished thermometer


  1. Arduino-compatible
  2. lasts more than 2 years on a pair of AA batteries
  3. measures temperature and pressure (BMP280) OR temperature, humidity and pressure (BME280)
  4. transmits data regularly to Blynk (or other platform, if you program it for it)
  5. can be programmed with just a simple USB-Serial converter

Required libraries

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