ash/Pi-Pico-ExpressionPedal2Midi
1
0
Fork 0
mirror of https://github.com/ashstrahle/Pi-Pico-ExpressionPedal2Midi.git synced 2025-12-31 19:49:51 +10:00
Code Issues Packages Projects Releases Wiki Activity

Working!

Browse Source
This commit is contained in:
Ashley Strahle
2021-01-30 18:12:45 +10:00
parent 27b6e34602
commit 1e6a74e825
2 changed files with 55 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
main-micropython.py
View File

@@ -1,40 +0,0 @@
import sys
from machine import ADC, Pin
import pyb
import midi
# Devices
exp = machine.ADC(31) # Expression pedal device on pin 31
serial = pyb.USB_VCP()
led = Pin(25, Pin.OUT)
# Expression pedal settings
exp_min = 0 # Expression pedal minimum value
exp_max = 65535 #Expression pedal maximum value
# Midi settings
midi_channel = 1 # Target midi channel to write to
cc = 68 # Target Control Change number - this is for Behringer X32 Matrix 5
cc_min = 0 # Minimum desired CC output
cc_max = 100 # Maximum desired CC output (only want fader to go to unity gain - hence not 127)
# This function translates the expression pedal value to the equivalent CC value
def translate(exp_val):
return (((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min
# Test the translate function:
# for i in range(65535):
# print (translate(i))
usb_midi = midi.Controller(serial, channel=midi_channel)
exp_value_previous = 0
while True:
exp_value_current = exp.read_u16()
if exp_value_current != exp_value_previous:
led.value(1) # Turn led on
cc_val = translate(exp_value_current)
usb_midi.control_change(cc, cc_val)
led.value(0) # Turn led off
exp_value_previous = exp_value_current
print("Writing CC value " + cc_val)

90
main.py
View File

@@ -1,50 +1,70 @@
import usb_midi import sys
import adafruit_midi from machine import ADC, Pin, UART
from adafruit_midi.control_change import ControlChange import ustruct
import digitalio
import analogio
# import busio
import board
import time import time
# Devices # Constants
exp = analogio.AnalogIn(board.A0) # Expression pedal ControlChange = 0xb0
led = digitalio.DigitalInOut(board.LED)
# led = Pin(25, Pin.OUT) # Devices
exp = machine.ADC(Pin(26)) # Expression pedal device on pin 31
uart = machine.UART(1, 31250) # UART Midi device on pin 6
led = machine.Pin(25, Pin.OUT) # Pico onboard led
# Expression pedal settings # Expression pedal settings
exp_min = 0 # Expression pedal minimum value # exp_min = 352 # Expression pedal minimum value
exp_max = 65535 #Expression pedal maximum value #exp_max = 65535 #Expression pedal maximum value
# Set these to reverse thresholds
exp_min = 65535
exp_max = 0
# Midi settings # Midi settings
midi_channel = 0 # Target midi channel to write to midi_channel = 1 # Target midi channel to write to
cc = 68 # Target Control Change number - this is for Behringer X32 Matrix 5 cc = 68 # Target Control Change number - this is for Behringer X32 Matrix 5
cc_min = 0 # Minimum desired CC output cc_min = 0 # Minimum desired CC output
cc_max = 100 # Maximum desired CC output (only want fader to go to unity gain - hence not 127) cc_max = 97 # Maximum desired CC output (only want fader to go to unity gain - hence not 127)
# This function translates the expression pedal value to the equivalent CC value # This function translates the expression pedal value to the equivalent CC value
def translate(exp_val): def translate(exp_val):
return int((((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min) ret = int((((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min)
if ret > 0:
return ret
else:
return 0
# return int((((exp_val - exp_min) * (cc_max - cc_min)) / (exp_max - exp_min)) + cc_min)
midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=midi_channel) exp_previous = 0
# uart = busio.UART(board.GP4, board.GP5, baudrate=31250)
# midi = adafruit_midi.MIDI(midi_out=uart, out_channel=midi_channel)
cc_val_last = 0
led.switch_to_output(value=True)
while True: while True:
# cc_val = translate(exp.value) exp_current = exp.read_u16()
# if cc_val != cc_val_last: if exp_current > exp_max:
# led.switch_to_output(value=False) # Flicker led exp_max = exp_current
# midi.send(ControlChange(cc, cc_val)) # Write midi elif exp_current < exp_min:
# led.switch_to_output(value=True) exp_min = exp_current
# cc_val_last = cc_val
for i in range(100): if exp_current != exp_previous:
led.switch_to_output(value=True) led.value(1) # Turn led on
midi.send(ControlChange(cc, i)) cc_val = translate(exp_current)
led.switch_to_output(value=False) uart.write(ustruct.pack("bbb",ControlChange + midi_channel - 1,cc,cc_val))
time.sleep(0.05) led.value(0) # Turn led off
exp_previous = exp_current
print("Writing Midi Channel: {}, ControlChange: {}, Value {}. Exp Pedal: cur: {}, min: {}, max: {}".format(midi_channel, cc, cc_val, exp_current, exp_min, exp_max))
# max = 0
# min = 66000
# while True:
# exp_current = exp.read_u16()
# if exp_current > max:
# max = exp_current
# if exp_current < min:
# min = exp_current
# print ("Current value: {}, min: {}, max: {}".format(exp_current, min, max))
# time.sleep(0.1)
# while True:
# for i in range(97):
# led.value(1)
# uart.write(ustruct.pack("bbb",ControlChange + midi_channel - 1,cc,i))
# print("Writing CC value " + str(i))
# led.value(0)
# time.sleep(0.1)