Read Wii Nunchuck Data with an Arduino

Categories: PC Connect, Video, Wiimote Hack.

If you are interested in reading the raw Nunchuck data for a project, the code provided here can help you do that using an Arduino microcontroller.

“With a little hacking, data can be read from a wii nunchuck directly into an Arduino, using TWI (aka I2C). The nunchuck contains a 3 axis accelerometer, joystick and buttons for only $19.95. The same accelerometer in kit form, cost $34.95 at Sparkfun. Plus the nunchuck is already wired up in a nice clean case! So the wii nunchuck should fit nicely into anyones robotic project.”

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“The nunchuck uses a proprietary connector. I just cut the end off of my nunchuck cable. The cable has 4 wires.
white – ground
red – 3.3+v
green – data
yellow – clock

Attach white to the Arduino’s ground, red to 5 volt+, green to analog pin 4, yellow to analog pin 5. The nunchuck is only supposed to get 3.3+ volts. So far it has worked fine at 5 volts, but be warned. I am guessing that using the higher voltage will shorten the nunchucks lifespan.”

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