How to Make a Programmable Guitar Pedal With Arduino!

This DIY Guitar Pedal project is for guitarists, hackers, and programmers that want to learn about digital signal processing, effects, synthesizers, and experiment without deep knowledge of DSP, electronics, or hardcore programming. pedalSHIELD UNO is a lo-fi, programmable guitar pedal that works with the Arduino UNO/Genuino UNO boards and is Open Source & Open Hardware. Learn to create your own programmable DIY Guitar Pedal and add effects such as distortion, fuzz, and more to your music. You can program your own effects in C/C++ or even use the ready-to-play effects from the ElectroSmash forum we have set up to support this project.

You can either get the PCB for this project on the ElectroSmash store or you can make your own on a breadboard by following the schematics in this tutorial. Check out this demo video of the Arduino DIY Guitar Pedal:

Required Materials

Reference Qty Value Description Part Reference
C5,C2, C7, C8, C9 5 6.8n ceramic cap SR211C682MARTR1
C3, C6, C10 3 4.7u electrolytic cap ECE-A1EKA4R7
C1, C11 2 100n ceramic cap K104K10X7RF5UH5
C4 1 270p ceramic cap D271K20Y5PH63L6R
R12,R13, R10, R9, R6, R4, R3 7 4.7K Resistor, 1%,1/4W MFR-25FRF52-4K7
R5, R7, R8, 3 100K Resistor, 1%,1/4W MFR-25FRF52-100K
R1, R2 2 1M Resistor, 1%,1/4W MFR-25FRF52-1M
R11 1 1M2 Resistor, 1%,1/4W MFR-25FRF52-1M2
RV1 1 500K resistor trimmer 3319W-1-504
D1 1 Led 3mm blue blue led 3mm SSL-LX3044USBC
U1 1 TL972 pdip-8 op-amp rail-to-rail  TL972
IC Socket 1 dip 8 socket socket dor dip8 1-2199298-2
SW1 1 3DPT footswitch 3PDT footsitch 107-SF17020F-32-21RL
SW2 1 Toggle switch SPDT toogle switch 612-100-A1111
SW3, SW4 2 Pushbutton off-on pushbutton 103-1013-EVX
Conn1,2,3,4 1 40 pin header 2.54 pitch pin header
J1, J2 2 1/4 Jack audio stereo 6.35mm jack NMJ6HCD2

How Does it Work?

The system consists of three stages:

  • The Input Stage: Amplifies and filters the guitar signal making it ready for the Arduino Uno ADC (Analog do Digital Converter).
  • Arduino Board: Takes the digitalized waveform from the ADC and does all the Digital Signal Processing (DSP) creating effects (distortion, fuzz, volume, metronome…).
  • The Output Stage: Once the new waveform is created, the signal is taken from the Arduino digital outputs (two PWMs combined) and prepared to be sent to the next pedal or the guitar amp.

Read More:  How to Make a Programmable Guitar Pedal With Arduino!

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