the code We have a Samsung fridge/freezer. We've called multiple times about the fridge not cooling. They sent a technician out once, and chipped away and used hot air to get rid of the ice. Lo and behold, 1 month later, ice accumulates and causes the fridge to get in the 50f and above range.

So... IoT to the resuce! Wire up the Arduino Nano to the nRF24L01+ as per every board we use here. Next, you need 2 thermistors and ideally a photoresistor. This is the circuit (Fritzing file in files):

And here's the code for the Arduino to get you up and running:https://cdn.hackaday.io/files/12985555550240/fridge_sensor.zip