ColdSnap - Air Conditioner override controller
The ColdSnap is an air-conditioner override controller similar in purpose and basic function to the commercial "Coolbot" controller, but is simplified in that it does not have a display and input buttons; basic parameters are set in the program which is then downloaded to the Arduino ProMini microcontroller via a USB connected interface (FTDI Basic). A design option allows the adjustment control to vary the temperature setpoint without reprogramming; the range of the adjustment can be set when the Arduino program is compiled and downloaded (39F to 49F for instance).