SunAir - Solar Controller / Charger / Tracker Includes Open Source Software for Arduino and Raspberry Pi Solar Power System Board for your Arduino / Raspberry Pi Solar Power Charger for your Phone or Battery Pack You can use this board to power your projects and add a servo or stepper motor to allow it to track the sun using photoresistors to generate even more power! It incorporates a number of outstanding features in a very compact, inexpensive single fully assembled and tested PC Board. Full Documentation and Software on www.switchdoc.com