58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
# SPDX-FileCopyrightText: 2021 Sandy Macdonald
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#
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# SPDX-License-Identifier: MIT
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# Demonstrates how to send MIDI notes by attaching handler functions to key
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# presses with decorators.
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# You'll need to connect Keybow 2040 to a computer running a DAW like Ableton,
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# or other software synth, or to a hardware synth that accepts USB MIDI.
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# Drop the keybow2040.py file into your `lib` folder on your `CIRCUITPY` drive.
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# NOTE! Requires the adafruit_midi CircuitPython library also!
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import time
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import board
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from keybow2040 import Keybow2040
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import usb_midi
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import adafruit_midi
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from adafruit_midi.note_off import NoteOff
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from adafruit_midi.note_on import NoteOn
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# Set up Keybow
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i2c = board.I2C()
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keybow = Keybow2040(i2c)
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keys = keybow.keys
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# Set USB MIDI up on channel 0.
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midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0)
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# The colour to set the keys when pressed.
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rgb = (0, 255, 50)
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# Initial values for MIDI note and velocity.
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start_note = 36
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velocity = 127
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# Loop through keys and attach decorators.
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for key in keys:
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# If pressed, send a MIDI note on command and light key.
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@keybow.on_press(key)
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def press_handler(key):
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note = start_note + key.number
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key.set_led(*rgb)
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midi.send(NoteOn(note, velocity))
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# If released, send a MIDI note off command and turn off LED.
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@keybow.on_release(key)
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def release_handler(key):
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note = start_note + key.number
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key.set_led(0, 0, 0)
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midi.send(NoteOff(note, 0))
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while True:
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# Always remember to call keybow.update()!
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keybow.update()
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