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whammy-arduino

A MIDI controller for the Digitech Whammy IV effects pedal.

Demo on Youtube

Pedal externals Pedal guts

The implementation currently provides these modes:

  • Active (LED blue): Ramp towards toe-down when active, ramp towards heel-down when inactive.
  • Waves (LED white):
    • Sine: ramp up and down following a nice smooth sine wave /‾\_/‾\_
    • Sawtooth up: linear ramp up, immediate return to zero ////
    • Sawtooth down: linear ramp down, immediate return to maximum `\\
    • Triangle: linear ramp up and down /\/\/
  • Sequencer (LED red):
    • Square _‾_‾
    • "Map of the Problematique"
    • Octaves -2, -1, 0, +1, +2
    • Random sequence
  • Scale (LED yellow): Random pedal positions quantised to a musical mode (Phrygian, Lydian, etc)
  • Random position (LED green): unquantised, random pedal positions.
  • 'Chaos' (LED cyan): random selection from the above modes.

Hardware

  • Wiring diagram here
  • Arduino Nano clone
  • 3 momentary buttons
  • One linear potentiometer
  • MIDI port
  • RGB LED
  • A few resistors, wire, case, etc.

Controls

On/off: activate the pedal.
Modifier + On/off: Toggle between momentary and latching activation. Momentary/latching mode persists in EEPROM between sessions so you don't need to change it every time.

Mode: move to the next pedal mode.
Modifier + Mode: move to previous mode.

Tempo potentiometer: Turn to change speed of all pedal functions.
Modifier + Tempo potentiometer: Limit the maximum range of the pedal position for tasteful vibrato-like operation [citation needed].

Modifier: Tap to change the musical mode used in 'quantized scale' mode.

In all modes, the LED brightness indicates the effective position of the pedal - brighter means toe-down, darker means heel-down.

monitor.pd

If you want to work on this project without going mad from constant atonal wee-woo noises, open monitor.pd with Pure Data to see a visualisation of the MIDI messages instead.

Visualisation with Pure Data

This project kept me busy while isolating with Covid 19 in April 2022. The illness provided some gnarly headaches and this project did not help with that whatsoever. Fun though.