Zoom MultiStomp Patch Changer

Change the current patch of your Zoom MultiStomp pedal using an Arduino Pro Mini, a USB Host Shield module, and your feet :)

Usage

• Click on buttons to decrement / increment patch value
• Longpress on buttons to decrement / increment patch value
• Longpress on both buttons to enable / disable tuner

Bill of materials

• Arduino Pro Mini (3.3v version)
• USB Host Shield v2.0
• 128x32 OLED screen
• 2x push buttons or momentary footswitches
• Dual 9v power supply
• USB-A to USB-Mini cable
• FTDI breakout board (configured for 3.3v) for code upload

Wiring

• The USB Host Shield should be soldered under (or above) the Arduino board; USB-A port facing one side, Arduino programming header facing the other (see pic)
• A4 and A5 pins should be wired to SDA / SCL on the OLED board; power is supplied using Arduino's VCC pin.
• Button pins are wired to analog A1 and A2, thus using internal pullup resistors.
• 9v power is supplied to the Arduino (through the RAW pin), and to the Zoom device.