Wii-Nunchuck is low cost combo of 3 axes accelerometer, 2 axes Joystick and 2 buttons. It communicated via I2C and we made UEXT connector for it so it plugs directly to AVR-T32U4 Arduino compatible breadboard.
The Arduino library is available at: https://github.com/OLIMEX/DUINO/tree/master/AVR/WII-NUNCHUCK with demo code which prints accelerometer, joystick and button status: http://www.youtube.com/watch?v=fodnHXkwpHg
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