Flash the Firmware

Download and install CircuitPython for your board by dragging the .uf2 file onto the board while it is in bootloader mode (hold BOOTSEL while plugging in on a Pico).

Copy the adafruit_hid folder from the Adafruit CircuitPython Bundle into the /lib directory on your CIRCUITPY drive.

Copy code.py to the root of the CIRCUITPY drive. If you used different pins in the previous step, edit the *_PIN constants near the top of the file before copying. The board will reboot automatically and the controller will start working immediately.