mirror of
https://github.com/ashstrahle/Pi-Pico-ExpressionPedal2Midi.git
synced 2025-12-31 19:49:51 +10:00
40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import sys
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from machine import ADC, Pin
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import pyb
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import midi
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# Devices
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exp = machine.ADC(31) # Expression pedal device on pin 31
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serial = pyb.USB_VCP()
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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 = 1 # 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 (((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min
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# Test the translate function:
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# for i in range(65535):
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# print (translate(i))
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usb_midi = midi.Controller(serial, channel=midi_channel)
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exp_value_previous = 0
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while True:
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exp_value_current = exp.read_u16()
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if exp_value_current != exp_value_previous:
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led.value(1) # Turn led on
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cc_val = translate(exp_value_current)
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usb_midi.control_change(cc, cc_val)
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led.value(0) # Turn led off
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exp_value_previous = exp_value_current
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print("Writing CC value " + cc_val) |