Wii Nunchuck Breakout Adapter
Breakout adapter that accepts a Wii Nunchuck connector and provides level-shifted I2C signals plus regulated power for use with 3.3V or 5V microcontrollers. Exposes the joystick, accelerometer, and two buttons over I2C.
Breakout adapter that accepts a Wii Nunchuck connector and provides level-shifted I2C signals plus regulated power for use with 3.3V or 5V microcontrollers. Exposes the joystick, accelerometer, and two buttons over I2C.
Power input for the breakout; Adafruit Learn says to give it the same power as the microcontroller logic level, for example 5V with Arduino.
3.3V output from the on-board voltage regulator; Adafruit says up to 100mA can be drawn.
Common ground for power and logic.
I2C clock line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
I2C data line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
STEMMA QT I2C connector for connecting to STEMMA QT boards/accessories; shares the board I2C and power contract.
Socket/cutout for a Wii Nunchuck controller; Adafruit states Wii controllers use a standard I2C interface and the notched side goes on the side marked Notch Up.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VIN | Power | Power input for the breakout; Adafruit Learn says to give it the same power as the microcontroller logic level, for example 5V with Arduino. | matches host logic supply, typically 3V to 5V |
| 3V | Power | 3.3V output from the on-board voltage regulator; Adafruit says up to 100mA can be drawn. | 3.3V output, up to 100mA |
| GND | Ground | Common ground for power and logic. | 0V |
| SCL | I2C | I2C clock line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn. | 3V to 5V logic |
| SDA | I2C | I2C data line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn. | 3V to 5V logic |
| STEMMA QT | Unknown | STEMMA QT I2C connector for connecting to STEMMA QT boards/accessories; shares the board I2C and power contract. | 3V to 5V logic supported by level shifting on I2C pins |
| Wii Nunchuck connector | Unknown | Socket/cutout for a Wii Nunchuck controller; Adafruit states Wii controllers use a standard I2C interface and the notched side goes on the side marked Notch Up. | I2C interface powered through breakout |
Power input for the breakout; Adafruit Learn says to give it the same power as the microcontroller logic level, for example 5V with Arduino.
3.3V output from the on-board voltage regulator; Adafruit says up to 100mA can be drawn.
Common ground for power and logic.
I2C clock line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
I2C data line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
STEMMA QT I2C connector for connecting to STEMMA QT boards/accessories; shares the board I2C and power contract.
Socket/cutout for a Wii Nunchuck controller; Adafruit states Wii controllers use a standard I2C interface and the notched side goes on the side marked Notch Up.
I2S · I2C · SPI · matches host logic supply, typically 3V to 5V · 3.3V output, up to 100mA
Confirm the data interface matches your host board.
Module pins: VIN, 3V, GND, SCL, SDA. Schematik maps them to your board in the app.
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