• Author: George-Alexandru Tudurean
• Email: george.tudurean@stud.acs.pub.ro
• Master: SRIC

At the grandma's house, where I currently live, I use a wood-burning central heating unit to stay warm during the winter months. This central heating unit uses a fan to provide fresh air to the fire, which turns off when the water (that's running through the radiators in the house) reaches the operating temperature (90 degrees Celsius). That's great, otherwise my pipes would explode.

What's controlling the fan, you may ask? A little knob on the side of the central heating unit that tells the fan (using a bimetalic strip) how cold the water has to be for it to start doing something.

That's great, but there is a small problem: when the fire dies down eventually, there is no mechanism in place to automatically tell the fan to not turn back on once the water temperature drops below the threshold set earlier by the knob… so you have to always go back to the central heating unit once the fire has started to turn the knob, in essence shutting down the fan for good.

I wanted to fix that :)

* ESP32-S3-devkitc-1 * 2 DS18B20 temperature sensors * 1 SG-05010 servomotor * a breadboard * a battery pack with 4 AAA batteries (6V)