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PiPicoMIDIPedalKeyboard.py
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PiPicoMIDIPedalKeyboard.py
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# Pi Pico USB UART MIDI Pedal Keyboard
# CircuitPython and USB and UART MIDI Version
#
# @diyelectromusic
# https://diyelectromusic.wordpress.com/
#
# MIT License
#
# Copyright (c) 2020 diyelectromusic (Kevin)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHERIN
# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
import board
import digitalio
import usb_midi
import busio
import adafruit_midi
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn
uart = busio.UART(board.GP0, board.GP1, baudrate=31250)
led = digitalio.DigitalInOut(board.GP25)
led.direction = digitalio.Direction.OUTPUT
usb_midi = adafruit_midi.MIDI(
midi_out=usb_midi.ports[1],
out_channel=0
)
def ledOn():
led.value = True
def ledOff():
led.value = False
firstnote = 36 # C2
keys = []
playnote = []
lastnote = []
def noteOn(x):
ledOn()
usb_midi.send(NoteOn(x,127))
uart.write(bytes([0x90,x,127]))
def noteOff(x):
usb_midi.send(NoteOff(x,0))
uart.write(bytes([0x80,x,0]))
ledOff()
ledOn()
# Switch OFF will be HIGH (operating in PULL_UP mode)
key_pins = [board.GP6,board.GP21,board.GP7,board.GP20,board.GP8,board.GP19,board.GP9,board.GP18,board.GP10,board.GP17,board.GP11,board.GP16,board.GP12]
numkeys = len(key_pins)
for kp in range(0, numkeys):
keys.append(digitalio.DigitalInOut(key_pins[kp]))
keys[kp].switch_to_input(pull=digitalio.Pull.UP)
for k in range(0, numkeys):
# initialise the note list
playnote.append(0)
lastnote.append(0)
ledOff()
while True:
# Scan for buttons pressed on the rows
# Any pressed buttons will be LOW
for k in range(0, numkeys):
if (keys[k].value == False):
playnote[k] = 1
print ("Key: ", k)
else:
playnote[k] = 0
#print (lastnote)
#print (playnote)
# Now see if there are any off->on transitions to trigger MIDI on
# or on->off to trigger MIDI off
for n in range(0, len(playnote)):
if (playnote[n] == 1 and lastnote[n] == 0):
noteOn(firstnote+n)
if (playnote[n] == 0 and lastnote[n] == 1):
noteOff(firstnote+n)
lastnote[n] = playnote[n]