How do you interface nunchuk with microcontroller?

To interface a nunchuk with a microcontroller, you typically connect the nunchuk to the microcontroller's I2C bus, using the SDA and SCL lines. The nunchuk requires power (usually 3.3V) and ground connections. You can then use a library or write custom code to read the data from the nunchuk, which includes joystick position and button states, by sending and receiving I2C messages. Make sure to properly initialize the I2C communication and handle data processing in your microcontroller's firmware.