mirror of
https://github.com/ashstrahle/Pi-Pico-ExpressionPedal2Midi.git
synced 2025-12-31 19:49:51 +10:00
50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import usb_midi
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import adafruit_midi
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from adafruit_midi.control_change import ControlChange
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import digitalio
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import analogio
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# import busio
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import board
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import time
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# Devices
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exp = analogio.AnalogIn(board.A0) # Expression pedal
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led = digitalio.DigitalInOut(board.LED)
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# led = Pin(25, Pin.OUT)
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# Expression pedal settings
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exp_min = 0 # Expression pedal minimum value
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exp_max = 65535 #Expression pedal maximum value
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# Midi settings
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midi_channel = 0 # Target midi channel to write to
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cc = 68 # Target Control Change number - this is for Behringer X32 Matrix 5
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cc_min = 0 # Minimum desired CC output
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cc_max = 100 # Maximum desired CC output (only want fader to go to unity gain - hence not 127)
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# This function translates the expression pedal value to the equivalent CC value
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def translate(exp_val):
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return int((((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min)
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midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=midi_channel)
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# uart = busio.UART(board.GP4, board.GP5, baudrate=31250)
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# midi = adafruit_midi.MIDI(midi_out=uart, out_channel=midi_channel)
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cc_val_last = 0
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led.switch_to_output(value=True)
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while True:
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# cc_val = translate(exp.value)
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# if cc_val != cc_val_last:
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# led.switch_to_output(value=False) # Flicker led
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# midi.send(ControlChange(cc, cc_val)) # Write midi
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# led.switch_to_output(value=True)
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# cc_val_last = cc_val
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for i in range(100):
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led.switch_to_output(value=True)
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midi.send(ControlChange(cc, i))
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led.switch_to_output(value=False)
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time.sleep(0.05) |