8BitDo-keyboard

Pi Pico-based solution for running 8BitDo keyboard extensions directly to USB

What you need

An 8BitDo Keyboard Extension. One (or multiple) of these:
- https://shop.8bitdo.com/products/8bitdo-keyboard-extensions
A Raspberry Pi Pico board
- https://www.raspberrypi.com/products/raspberry-pi-pico/
- You can use the most basic version. Wifi not required.
A pair of TRS (audio jack) breakout boards
- like this one: https://core-electronics.com.au/trrs-3-5mm-jack-breakout.html
- Can be any brand
- I'm using two, since my chosen 8BD Extension needs two jacks
Hook up wire
Some light soldering

A very quick and dirty wiring of the audio jacks to the Pi Pico.

A close-up of the ABXY split-plug, connected with two audio jacks.

Install Circuit Python on to your Pico
- https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython/circuitpython
Install the Adafruit Circuit Python libraries
- Download from https://circuitpython.org/libraries
- Open your CIRCUITPY drive
- Copy the following libraries (listed below) into your CIRCUITPY/lib/ folder
  - adafruit_hid (the whole folder)
  - adafruit_debouncer.mpy
  - adafruit_ticks.mpy
Copy code.py (from this repository) into the root CIRCUITPY/ folder
(maybe) You might need to unplug and reconnect the Pico to your computer for changes to be seen
Open VS Code (or Notepad) and test your buttons

Open the code.py file in VS Code or Notepad, and find the following lines in the file
Amend the codes to customise your keys

17: # Set your keys here
18: btn_A_key = Keycode.Q
19: btn_B_key = Keycode.W
20: btn_X_key = Keycode.E
21: btn_Y_key = Keycode.R