The Basic Idea

So the idea is to make a simple thermistate, too hot, turn on the cooler, too cold turn off the cooler. Yeah I know, not a great control system, but you know what, if thats what works for a house, then why wouldn't it work here.

The controller was very simple, a micro-controller, a mos-fet to control power to a fan and the cooling unit, and a temperature sensor. This part was simple and easy to do, get some cheap parts on line, a surplus pelter-junction and slap it all together. The big problem that I came to is figuring out the best solution to actually making the fridge case.