This is the controller board for a 3D printer filament drying/storage box. It uses a 3d printer bed heater to heat the box and a thermoelectric cooling element to dehumidify the air inside the box. The board also has connectors for the bed heater thermistor, two I2C buses for temperature/humidity sensors, 3 fan connectors and a SparkFun Microview display. Remote communication is provided by an Xbee radio. Everything is controlled by an Atmega 328P.