Often the thermostat on a fridge can break rendering the entire fridge useless without costly repair. Fortunately, like most problems, this can be solved using Arduino! Asynkronix has put together a great guide on how you can use an Arduino to cheaply replace a broken thermostat in your fridge. The fix works by reading the temperature inside the fridge and using the Arduino to switch on and off the cooling compressor as needed using a relay. To find out more about how you can fix your own fridge checkout the following link.