Presto Dehydrator Control Kit

Updated code: https://github.com/truglodite/Dehydrator

I decided to hack my Presto 6302 food dehydrator to control it with an Arduino 328p. The result is a smart dehydrator that uses a table of drying profiles (temperature and time) based on suggestions at printdry.com. The heater and fan are separately relay controlled, so the fan can run a little longer in holding mode after the heater turns off to prevent overheating of the appliance. In dry mode the temperature is controlled to the recomm