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.

Logical pinout · physical placement not verified

VIN
Power input for the breakout; Adafruit Learn says to give it the same power as the microcontroller logic level, for example 5V with Arduino.
Type · PowerVoltage · matches host logic supply, typically 3V to 5V
3V
3.3V output from the on-board voltage regulator; Adafruit says up to 100mA can be drawn.
Type · PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCL
I2C clock line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
Type · I2CVoltage · 3V to 5V logic
SDA
I2C data line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
Type · I2CVoltage · 3V to 5V logic
STEMMA QT
STEMMA QT I2C connector for connecting to STEMMA QT boards/accessories; shares the board I2C and power contract.
Type · UnknownVoltage · 3V to 5V logic supported by level shifting on I2C pins
Wii Nunchuck connector
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.
Type · UnknownVoltage · I2C interface powered through breakout

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

Logical pinout · physical placement not verified

Pin details

7 connections

VIN
Power input for the breakout; Adafruit Learn says to give it the same power as the microcontroller logic level, for example 5V with Arduino.
PowerVoltage · matches host logic supply, typically 3V to 5V
3V
3.3V output from the on-board voltage regulator; Adafruit says up to 100mA can be drawn.
PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
GroundVoltage · 0V
SCL
I2C clock line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
I2CVoltage · 3V to 5V logic
SDA
I2C data line; level shifted for 3V to 5V logic with a 10K pull-up according to Adafruit Learn.
I2CVoltage · 3V to 5V logic
STEMMA QT
STEMMA QT I2C connector for connecting to STEMMA QT boards/accessories; shares the board I2C and power contract.
UnknownVoltage · 3V to 5V logic supported by level shifting on I2C pins
Wii Nunchuck connector
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.
UnknownVoltage · I2C interface powered through breakout

Start wiring

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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