This is a WiiChuck Adapter board designed to interface your Nintendo Wii Nunchuck (WiiChuck) controller with your Arduino, Raspberry Pi, or other micro controller.  This adapter board provides access to all four of the wires for the WiiChuck controller.  The WiiChuck  includes a +5V pin, ground pin, and and two wire I2C serial interface.  This interface board will allow you access to the 2-axis joystick, two control buttons, and 3-axis accelerometer built into the WiiChuck controller.  The WiiChuck is an inexpensive controller with loads of features that will take your project to the next level and this is the board that will make it possible.