An awesome project that allows you to use your android phone to control a quadcopter.. for more information visit the google code page
The idea came from the fact that smartphones now feature a lot of nice components useful for a drone. For example, the Nexus 4 used in this project has:
-sensors: accelerometer, gyrometer, magnetometer, barometer, GPS.
-wireless communication: Wi-Fi, 3G.
-a powerful quad-core processor, with a GPU.