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Content Simple thermostat that expects a relay that will close setting high to pin33 And on pin12 a DS18B20 onewire tempsensor It will also check for a BME280 temp/humidity/pressure sensor on the i2c bus. If it cannot detect a temp sensor it will fall back to using the interal temp sensor, Since it is on the CPU it will be more likely be the CPU temp and not the room temp.