Wii Nunchuk

Overview

The Nunchuk (model number RVL-004) is a corded controller peripheral for the Nintendo Wii Remote. The device input consists of an analog stick, a trigger button labeled "Z", a button labeled "C", and a three axis accelerometer provided by STMicroelectronics (part# LIS3L02AL)[1]. Functionally similar clones are also available from various third party providers.

The Nunchuk measurements are 113 mm (4.45 in) x 38 mm (1.5 in) x 37 mm (1.48 in).

The Nunchuk communicates via I²C and can be used as an input in compatible devices such as Arduino.

Technical Information

The Nunchuk uses a proprietary connector. The cable itself contains 4 wires:

Information based on Nunchuk for Adruino Tutorial from WindMeadow Labs. Information verified through experimentation.[2]

red - 3.3+V power white - ground green - data yellow - clock

The Arduino uses "fast" I²C. To communicate,a device must send a handshake to the device:

0x40 - Begin connection 0x00 - request data

Data is requested each time the device is polled with "0x00". Data is returned with 6 byte chunks.

Byte	Description	Values of sample Nunchuk
1	X-Axis Value of the Analog Stick	Min(Full Left):0x1E / Medium(Center):0x7E / Max(Full Right):0xE1
2	Y-Axis Value of the Analog Stick	Min(Full Down):0x1D / Medium(Center):0x7B / Max(Full Right):0xDF
3	Accelerometer X-Axis Value	Min(at 1G):0x48 / Medium(at 1G):0x7D / Max(at 1G):0xB0
4	Accelerometer Y-Axis Value	Min(at 1G):0x46 / Medium(at 1G):0x7A / Max(at 1G):0xAF
5	Accelerometer Z-Axis Value	Min(at 1G):0x4A / Medium(at 1G):0x7E / Max(at 1G):0xB1
6	Button state	Bit 0: "Z"-Button (0 = pressed, 1 = released) / Bit 1: "C" button (0 = pressed, 1 = released) / Bits 2-3: X acceleration LSB / Bits 4-5: Y acceleration LSB / Bits 6-7: Z acceleration LSB

External links

• TECHinsights.
• [http://www.windmeadow.com/node/42 WindMeadow Labs Wii Nunchuk for Arduino Tutorial.

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