measure water temperature of a solar water heater.
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hardware: ESP32. DS18B20. (uses ESP32 deep sleep mode).
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software: Micropython. Blynk.
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see https://medium.com/@pboudalier/how-much-solar-hot-water-do-i-have-4fdb4684281a
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see v2 for updated version (2023). uses Blynk legacy with private Blynk server running on raspberry pi as docker container