init

Midi-Expression-Pedal.py

@@ -0,0 +1,17 @@
+# 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))

README.md

@@ -1 +1,5 @@
-# Py-Pico-Midi-Expression-Pedal
+# Py-Pico-Midi-Expression-Pedal
+
+This is a Raspberry Pi Pico MicroPython project that takes an expression pedal input via a TRS 1/4" jack connected to ADC pins on the Pico, and outputs a Midi CC message equivalent via USB.
+
+Midi channel, CC number, and maximum and minimum values can all be set as required.