Frank writes -

I connected a Wii Nunchuck controller to an Arduino, which takes the data from the controller’s I2C data bus, decodes it, and send the data to the robot with a radio transmitter. Charlie uses a radio receiver to get the data, and it will control the drive servo system and the pan tilt servo system using the data. The Nunchuck has a 3 axis accelerometer, a joystick, and 2 buttons, it is absolutely awesome to use with a RC robot like this.

Wii Nunchuck Controlled Robot – Link.