Fridge / Fermenter Controller Kit Idea

I have been looking forward to providing simple electronic kits to

help people with homesteader projects. My first kit is going to be a

thermostat with 4-line text display. The idea is this thermostat can

be used with a device like a chest freezer to convert it over to a

refrigerator. This setup can reduce home refrigeration utilities by

20x. The same kit could also be used as a fermentation control device.

Using this kit would allow for a precision temperature controlled

environment which is important for things like tempeh, yogurt, cheese,

wine, etc... Here is the sketch of how things would connect. When

being used as a fermenter a heating element (20W light bulb) would

normally be used instead of the freezers compressor.

Done