Once you've finished setting up your Feather M4 Express with CircuitPython, you can add this library to the lib folder:
- adafruit_midi
Then, you can click on the Download: Project Zip link below to download the code.
# SPDX-FileCopyrightText: 2020 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import digitalio
import usb_midi
import adafruit_midi
from adafruit_midi.note_on import NoteOn
# pins for the solenoid output signals
noid_pins = [board.D5, board.D6, board.D9, board.D10]
# array for the solenoids
noids = []
# setup for the solenoid pins to be outputs
for pin in noid_pins:
noid = digitalio.DigitalInOut(pin)
noid.direction = digitalio.Direction.OUTPUT
noids.append(noid)
# MIDI note array
notes = [60, 61, 62, 63]
# MIDI in setup
midi = adafruit_midi.MIDI(midi_in=usb_midi.ports[0], in_channel=0)
# delay for solenoids
speed = 0.03
retract = 0
while True:
# msg holds MIDI messages
msg = midi.receive()
for i in range(4):
# states for solenoid on/off
noid_output = noids[i]
# states for MIDI note recieved
notes_played = notes[i]
# if NoteOn msg comes in and the MIDI note # matches with predefined notes:
if isinstance(msg, NoteOn) and msg.note is notes_played:
print(time.monotonic(), msg.note)
# solenoid is triggered
noid_output.value = True
# quick delay
retract = time.monotonic()
# retracts solenoid using time.monotonic() to avoid delays between notes activating
if (retract + speed) < time.monotonic():
noid_output.value = False
Your Feather M4 Express CIRCUITPY drive should look like this after you load the libraries and code.py file:
