This “Keychain-Satellite”, just 5*5*5 cm, uses tiny Arduino based hardware
Watch FemtoSatellite model(1/2)
[youtube http://www.youtube.com/watch?v=M57MpkEiebA&w=420&h=315]
Watch FemtoSatellite model(2/2)
[youtube http://www.youtube.com/watch?v=xyUw1iP_P0M&w=420&h=315]
More pictures and information at http://tinyurl.com/cepqnrh