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Hardware:
Very affordable on Banggood/AliExpress.
For configuration examples see images and/or Fritzing
(in the download).
Total cost: ~$/€ 12.00.
- Sonoff ESP8266 module
- Waterproof DS18B20 Digital, 1-Wire, temperature sensor
- 4.7KΩ resistor
- 0.5m/yd 3-wire cord with plugs