Teensy Wii Nunchuck MIDI controller

This project contains code and information for making a Teensy-based Wii Nunchuck MIDI controller.

Parts

• Wii Nunchuck controller
• Teensy (I'm using version 3.2)
• WiiChuck adapter
• Two 4.7K resistors
• Breadboard (or some other means of wiring the components)
• Header pins for the WiiChuck adapter

Circuit

• Connect the WiiChuck '-' to GND
• Connect the WiiChuck '+' to 3.3V
• Connect the WiiChuck 'D' to the Teensy SDA0
• Connect the WiiChuck 'C' to the Teensy SCL0
• Use 4.7K pullup resistors on SCL0 and SDA0

Software

Install the Arduino IDE and Teensyduino

Install the Arduino IDE and the Teensyduino add-on for the Arduino IDE.

Build the code and upload to the Teensy

• Open the TeensyNunchuckMidi sketch
• Select "MIDI" from the Tools / USB Type menu
• Run Verify/Compile
• Push the button on the Teensy to upload

MIDI

The Teensy sketch sends analog stick position and Nunchuck roll and pitch orientation as MIDI control change events. The channel number and control numbers are specified in constants at the top of the TeensyNunchuckMidi.ino file.

The default channel number is 1.

The default control assignments are:

Value	Control number
Analog stick X	0
Analog stick Y	1
Roll	2
Pitch	3

Acknowledgments and Resources

The code for interfacing with the Nunchuck controller is based on:

• Tim Hirzel's WiiChuck class on Arduino Playground
• Tod E. Kurt's wiichuck_adapter project

Further information on the protocol for interfacing with the Nunchuck controller can be found at the following:

• Nunchuck information at WiiBrew
• CoD4 Nunchuk Leaner

Resources for Teensy programming:

• Wire Arduino Library on Teensy
• USB MIDI on Teensy

License

This project is distributed under the terms of the MIT License.