Pedal-Pi: Programmable Guitar Pedal

Overview

Pedal-Pi is a lo-fi programmable guitar pedal that works with the Raspberry Pi ZERO Board. The project is totally Open Source & Open Hardware and made for hackers, programmers and musicians that want to experiment with sounds and learn about digital audio.

You can code your own effects using standard C and get inspiration from the ready-to-use effects from the forum, like the Clean/Transparent, Booster/Volume, Distortion, Fuzz, Delay, Echo, Octaver, Reverb, Tremolo, Looper, etc.

We created some documents so you can do the project easily:

• PDF manual to build Pedal-Pi in 4 Steps.

• Guide of how to Start Programming Pedal-Pi.

• List of the best forum topics.

• Main Pedal-Pi Article.

Specifications:

• Based in Raspberry Pi Zero (1GHz ARM11 core).

• Analog stages using MCP6002 rail-to-rail operational amplifier.

• ADC: 12bits / Sampling Rate 50Ksps (MCP3202).

• Output Stage: 12 bits (2x6bits PWMs running in parallel)

Pi Zero:

• 1GHz ARM11 core.

• 512MB of LPDDR2 SDRAM.

• Micro-SD card slot.

Interface:

• 2 Configurable push buttons.

• 1 Configurable switch.

• 1 programmable blue led.

• True Bypass Foot-switch.

Connectors:

• Input Jack, 1/4 inch unbalanced, Zin=1MΩ.

• Output Jack, 1/4 inch unbalanced, Zout=100Ω.

• Power supply: power taken from the Pi Zero board (micro-USB).

Review by Blitz City DIY: