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TheKittyTheKitty
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Merge pull request #2033 from adafruit/midi_for_makers
Adding code for MIDI for Makers guide
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‎MIDI_for_Makers/BLE_MIDI_Sequencer/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import time
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import adafruit_ble
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import touchio
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import board
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import adafruit_midi
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import adafruit_ble_midi
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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from adafruit_midi.note_on import NoteOn
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from adafruit_midi.note_off import NoteOff
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# CLUE cap touch setup
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c_touch = touchio.TouchIn(board.D0)
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f_touch = touchio.TouchIn(board.D1)
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g_touch = touchio.TouchIn(board.D2)
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# array of touch pads
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pads = [c_touch, f_touch, g_touch]
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# BLE MIDI setup
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midi_service = adafruit_ble_midi.MIDIService()
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advertisement = ProvideServicesAdvertisement(midi_service)
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ble = adafruit_ble.BLERadio()
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if ble.connected:
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for c in ble.connections:
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c.disconnect()
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# midi setup
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midi = adafruit_midi.MIDI(midi_out=midi_service, out_channel=0)
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print("advertising")
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ble.start_advertising(advertisement)
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# MIDI note numbers for C, F and G major triads
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c_triad = (60, 64, 67)
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f_triad = (65, 69, 72)
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g_triad = (67, 71, 74)
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# array of triads
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triads = [c_triad, f_triad, g_triad]
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# touch debounce states
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c_pressed = False
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f_pressed = False
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g_pressed = False
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# array of debounce states
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triad_states = [c_pressed, f_pressed, g_pressed]
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# beginning triad
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active_triad = c_triad
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# variable for triad index
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z = 0
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while True:
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# BLE connection
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print("Waiting for connection")
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while not ble.connected:
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pass
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print("Connected")
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time.sleep(1.0)
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# while BLE is connected...
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while ble.connected:
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# iterate through the touch inputs
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for i in range(3):
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inputs = pads[i]
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# if a touch input is detected...
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if inputs.value and triad_states[i] is False:
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# debounce state activated
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triad_states[i] = True
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# update triad
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active_triad = triads[i]
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print(active_triad)
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# after touch input...
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if not inputs.value and triad_states[i] is True:
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# reset debounce state
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triad_states[i] = False
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# send triad arpeggios out with half second delay
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midi.send(NoteOn(active_triad[z]))
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time.sleep(0.5)
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midi.send(NoteOff(active_triad[z]))
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time.sleep(0.5)
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# increase index by 1
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z += 1
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# reset index at end of triad
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if z > 2:
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z = 0
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# BLE connection
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print("Disconnected")
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print()
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ble.start_advertising(advertisement)

‎MIDI_for_Makers/Basic_MIDI_Keyboard/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import board
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import digitalio
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import usb_midi
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import adafruit_midi
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from adafruit_midi.note_on import NoteOn
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from adafruit_midi.note_off import NoteOff
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# midi setup
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midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0)
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# midi note numbers
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midi_notes = [60, 64, 67, 72]
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# digital pins for the buttons
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key_pins = [board.D5, board.D6, board.D9, board.D10]
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# array for buttons
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keys = []
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# setup buttons as inputs
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for key in key_pins:
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key_pin = digitalio.DigitalInOut(key)
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key_pin.direction = digitalio.Direction.INPUT
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key_pin.pull = digitalio.Pull.UP
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keys.append(key_pin)
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# states for buttons
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key0_pressed = False
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key1_pressed = False
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key2_pressed = False
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key3_pressed = False
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# array for button states
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key_states = [key0_pressed, key1_pressed, key2_pressed, key3_pressed]
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while True:
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# iterate through 4 buttons
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for i in range(4):
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inputs = keys[i]
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# if button is pressed...
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if not inputs.value and key_states[i] is False:
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# update button state
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key_states[i] = True
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# send NoteOn for corresponding MIDI note
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midi.send(NoteOn(midi_notes[i], 120))
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# if the button is released...
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if inputs.value and key_states[i] is True:
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# send NoteOff for corresponding MIDI note
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midi.send(NoteOff(midi_notes[i], 120))
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key_states[i] = False

‎MIDI_for_Makers/Control_Motors_with_MIDI/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import board
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import pwmio
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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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from adafruit_motor import servo
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# pwm setup for servo
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pwm = pwmio.PWMOut(board.D2, duty_cycle=2 ** 15, frequency=50)
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# servo setup
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motor = servo.Servo(pwm)
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# midi setup
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midi = adafruit_midi.MIDI(
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midi_in=usb_midi.ports[0], in_channel=0, midi_out=usb_midi.ports[1], out_channel=0
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)
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while True:
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# receive midi input
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msg = midi.receive()
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if msg is not None:
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# if a NoteOn message is received...
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if isinstance(msg, NoteOn):
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# servo set to 180 degrees
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motor.angle = 180
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# if a NoteOff message is received...
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if isinstance(msg, NoteOff):
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# servo set to 0 degrees
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motor.angle = 0

‎MIDI_for_Makers/MIDI_CC_Control_with_Pots/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import board
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import usb_midi
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import adafruit_midi
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import simpleio
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from analogio import AnalogIn
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from adafruit_midi.control_change import ControlChange
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from adafruit_midi.pitch_bend import PitchBend
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# midi setup
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midi = adafruit_midi.MIDI(
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midi_in=usb_midi.ports[0], in_channel=0, midi_out=usb_midi.ports[1], out_channel=0
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)
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# potentiometer setup
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mod_pot = AnalogIn(board.A0)
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pitchDown_pot = AnalogIn(board.A1)
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pitchUp_pot = AnalogIn(board.A2)
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sus_pot = AnalogIn(board.A3)
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# function to read analog input
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def val(pin):
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return pin.value
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# variables for last read value
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# defaults to 0
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# no pitchbend is 8192
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mod_val2 = 0
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pitchDown_val2 = 8192
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pitchUp_val2 = 8192
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sus_val2 = 0
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while True:
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# map range of analog input to midi values
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# pitchbend range is 0 to 16383 with 8192 centered or no pitchbend
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mod_val1 = round(simpleio.map_range(val(mod_pot), 0, 65535, 0, 127))
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pitchDown_val1 = round(simpleio.map_range(val(pitchDown_pot), 0, 65535, 0, 8192))
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pitchUp_val1 = round(simpleio.map_range(val(pitchUp_pot), 0, 65535, 8192, 16383))
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sus_val1 = round(simpleio.map_range(val(sus_pot), 0, 65535, 0, 127))
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# if modulation value is updated...
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if abs(mod_val1 - mod_val2) > 2:
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# update mod_val2
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mod_val2 = mod_val1
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# create integer
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modulation = int(mod_val2)
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# create CC message
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modWheel = ControlChange(1, modulation)
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# send CC message
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midi.send(modWheel)
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# pitchbend down value is updated...
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if abs(pitchDown_val1 - pitchDown_val2) > 75:
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# update pitchDown_val2
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pitchDown_val2 = pitchDown_val1
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# create PitchBend message
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pitchDown = PitchBend(int(pitchDown_val2))
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# send PitchBend message
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midi.send(pitchDown)
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# pitchbend up value is updated...
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if abs(pitchUp_val1 - pitchUp_val2) > 75:
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# updated pitchUp_val2
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pitchUp_val2 = pitchUp_val1
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# create PitchBend message
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pitchUp = PitchBend(int(pitchUp_val2))
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# send PitchBend message
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midi.send(pitchUp)
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# sustain value is updated...
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if abs(sus_val1 - sus_val2) > 2:
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# update sus_val2
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sus_val2 = sus_val1
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# create integer
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sustain = int(sus_val2)
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# create CC message
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sustainPedal = ControlChange(64, sustain)
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# send CC message
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midi.send(sustainPedal)

‎MIDI_for_Makers/Receive_MIDI_Over_UART_and_Send_Over_USB/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import board
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import busio
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import adafruit_midi
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import usb_midi
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from adafruit_midi.control_change import ControlChange
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from adafruit_midi.pitch_bend import PitchBend
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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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# uart setup
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uart = busio.UART(board.TX, board.RX, baudrate=31250)
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# midi channel setup
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midi_in_channel = 1
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midi_out_channel = 1
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# midi setup
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# UART is setup as the input
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# USB is setup as the output
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midi = adafruit_midi.MIDI(
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midi_in=uart,
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midi_out=usb_midi.ports[1],
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in_channel=(midi_in_channel - 1),
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out_channel=(midi_out_channel - 1),
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debug=False,
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)
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print("MIDI UART In/USB Out")
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print("Default output channel:", midi.out_channel + 1)
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# array of message types
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messages = (NoteOn, NoteOff, PitchBend, ControlChange)
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while True:
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# receive MIDI input from UART
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msg = midi.receive()
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# if the input is a recognized message...
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if msg is not None:
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for i in range(0, 3):
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# iterate through message types
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# makes it so that you aren't sending any unnecessary messages
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if isinstance(msg, messages[i]):
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# send the input out via USB
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midi.send(msg)
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print(msg)

‎MIDI_for_Makers/Receive_and_Display_MIDI_Messages/code.py‎

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# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import board
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import busio
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import usb_midi
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import adafruit_midi
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import displayio
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import terminalio
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from adafruit_display_text import label
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import adafruit_displayio_ssd1306
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from adafruit_midi.control_change import ControlChange
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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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from adafruit_midi.pitch_bend import PitchBend
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displayio.release_displays()
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oled_reset = board.D1
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# I2C setup for display
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i2c = busio.I2C(board.SCL1, board.SDA1)
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display_bus = displayio.I2CDisplay(i2c, device_address=0x3D, reset=oled_reset)
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# midi setup
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print(usb_midi.ports)
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midi = adafruit_midi.MIDI(
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midi_in=usb_midi.ports[0], in_channel=0, midi_out=usb_midi.ports[1], out_channel=0
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)
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msg = midi.receive()
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# display width and height setup
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WIDTH = 128
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HEIGHT = 32
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BORDER = 5
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# display setup
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display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=WIDTH, height=HEIGHT)
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splash = displayio.Group()
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display.show(splash)
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# text area setup
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text = "MIDI Messages"
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text_area = label.Label(
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terminalio.FONT, text=text, color=0xFFFFFF, x=28, y=HEIGHT // 2+1)
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splash.append(text_area)
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while True:
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# receive midi messages
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msg = midi.receive()
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if msg is not None:
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# if a NoteOn message...
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if isinstance(msg, NoteOn):
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string_msg = 'NoteOn'
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# get note number
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string_val = str(msg.note)
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# if a NoteOff message...
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if isinstance(msg, NoteOff):
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string_msg = 'NoteOff'
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# get note number
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string_val = str(msg.note)
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# if a PitchBend message...
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if isinstance(msg, PitchBend):
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string_msg = 'PitchBend'
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# get value of pitchbend
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string_val = str(msg.pitch_bend)
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# if a CC message...
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if isinstance(msg, ControlChange):
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string_msg = 'ControlChange'
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# get CC message number
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string_val = str(msg.control)
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# update text area with message type and value of message as strings
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text_area.text = (string_msg + " " + string_val)

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