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Es un calentador solar de agua echo específicamente con materiales reciclables, en los cuales se utiliza botellas PET de 1.3 y 3 litros, ademas de latas de aluminio de gaseosa o cerveza. He usado un ESP32 con sensores ds18x20, programado en microPython.

Solar hot water panels. Controlled with ESP8266 Wemos D1 mini. Pump turns on to pump water when it's hotter outside.

Temperature of Cold & Hot Water Supply (Pipe) (Location: Tehran-Iran)

just for sake of testing