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.
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- Hacker Hotel 2019