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Nunchuck

A Nunchuck controller from a Nintendo Wii can be used as input device for Galagino builds. They are inexpensive and since they use i2c for communication, they only require 2 GPIO pins to connect them up.

Hardware Required

  • Nunchuck controller - Official Nintendo ones are generally better (maybe try second-hand options), but third-party ones also work fine.
  • A Nunchuck adapter - Here is one from Adafaruit, but there are many different options available for these, even the cheap ones from Aliexpress work perfectly.

Wiring

  • SDA and SCL of the Nunchuck can be connected to any two GPIO of the ESP32.
  • Power pins of the Nunchuck should be connected to 3.3v and Gnd

Note: I have found pull-ups resistors are not required on SDA and SCL

Configuration

The nunchuck can be enabled in 'conf.h' as follows

#define NUNCHUCK_INPUT

#define NUNCHUCK_SDA 22 // The GPIO pin connected to SDA of the nunchuck
#define NUNCHUCK_SCL 27 // The GPIO pin connected to SCL of the nunchuck

#define NUNCHUCK_MOVE_THRESHOLD 30 // This is the dead-zone for where minor movements on the stick will not be considered valid movements
                                   // Increase this value if you want to increase how far you need to move the nunchuck for a valid movement

Note: At time of writing the Start and optional Coin button are not enabled on the nunchuck and will still need to be wired to regular GPIO buttons

Software

The nunchuck code requires an addtional library to be installed, NintendoExtensionCtrl. It can be installed from the library manager.