WiiChuck Library

     One of my favorite libraries for Arduino is the WiiChuck library. WiiChuck allows the Arduino to interface to a Wii Nunchuck. What is cool about the Nunchuck is that it has a three-axis accelerometer, a two-axis joystick, and two buttons. And it's I2C, so it's easy to work with. However, you will need one of these things to actually use it. You'll also need to solder four header pins to little PCB so you can plug it into the Arduino.

There are five contacts in the WiiChuck socket. Three on the right, two on the left.