Over the last few months the purchase price of remote-controlled helicopters and quadcopters has dropped quite considerably, firmly placing them into the "hackable" category. Normally hacking into inexpensive RC devices would simply involve cracking open the remote controller and connecting the Arduino's digital outputs to the buttons with a little extra circuitry.
However for the quadcopter, Nikolaj Møbius discovered that the control was via a digital RF module - and using an Arduino he determined the protocol used for data transmission to the copter. With that information, he removed the transmitter from the original controller and added it to a protoshield - enabling full Arduino and thus PC control of the quadcopter. An example of this in action is shown in the following video:
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