Simple MIDI button (foot switch) for the WaveShare RP2040-Zero (Raspbery Pi Pico clone) done using CircuitPython. The idea behind it was to have a super inexpensive physical trigger for use inside vMix, that would allow the sign language interpreter to decide when he/she wants to be visible on screen (a task that would be otherwise delegated to …

midi_button.py

import board
import digitalio
import busio
import usb_midi
import adafruit_midi
import neopixel
from adafruit_debouncer import Debouncer
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn

usb_midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0, debug=True)

pin = digitalio.DigitalInOut(board.GP2)
pin.direction = digitalio.Direction.INPUT
pin.pull = digitalio.Pull.UP
switch = Debouncer(pin, interval=0.05)

pixel = neopixel.NeoPixel(board.GP16, 1)
pixel.brightness = 0.3

while True:
    switch.update()
    if switch.rose:
        usb_midi.send(NoteOff(50, 0))
        pixel.fill((0, 0, 0))
        print('released')
    if switch.fell:
        usb_midi.send(NoteOn(50, 127))
        pixel.fill((255, 0, 0))
        print('pressed')