mirror of
https://github.com/ashstrahle/Pi-Pico-ExpressionPedal2Midi.git
synced 2025-12-31 19:49:51 +10:00
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
import sys
|
|
from machine import ADC, Pin, UART
|
|
import ustruct
|
|
import time
|
|
|
|
# Constants
|
|
ControlChange = 0xb0
|
|
|
|
# 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
|
|
# exp_min = 352 # Expression pedal minimum value
|
|
#exp_max = 65535 #Expression pedal maximum value
|
|
# Set these to reverse thresholds
|
|
exp_min = 65535
|
|
exp_max = 0
|
|
|
|
# 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 = 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
|
|
def translate(exp_val):
|
|
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)
|
|
|
|
exp_previous = 0
|
|
|
|
while True:
|
|
exp_current = exp.read_u16()
|
|
if exp_current > exp_max:
|
|
exp_max = exp_current
|
|
elif exp_current < exp_min:
|
|
exp_min = exp_current
|
|
|
|
if exp_current != exp_previous:
|
|
led.value(1) # Turn led on
|
|
cc_val = translate(exp_current)
|
|
uart.write(ustruct.pack("bbb",ControlChange + midi_channel - 1,cc,cc_val))
|
|
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) |