In the forum, the topic " Basics of Audio DSP in C for Raspberry Pi Zero" can assist you to learn the basics. Pi ZERO: It takes the digitalized audio waveform from the ADC and does all the Digital Signal Processing (DSP) creating effects (distortion, fuzz, delay, echo, tremolo.).In the forum, the topic " Using MCP3202 ADC with Raspberry Pi Zero" gives more details about the ADC-Pi ZERO connection. The ADC sends the signal to the PI ZERO using SPI communication.
The Input Stage: Amplifies and filters the guitar signal making it ready for the ADC (Analog to Digital Converter).Power supply: power taken from the Pi Zero board (micro-USB).Output Jack, 1/4 inch unbalanced, Zout=100 Ω.Input Jack, 1/4 inch unbalanced, Zin=0.5M Ω.Output Stage: 12 bits (2圆bits PWMs running in parallel).ADC: 12bits / Sampling Rate 50Ksps ( MCP3202).Analog stages using MCP6002 rail-to-rail operational amplifier.Based in Raspberry Pi Zero (1GHz ARM11 core).But take also into consideration that it is only 12 bits and does not feel like a finished pedal that you could buy in a shop. If you want to program digital audio effects in C without deep knowledge of DSP languages or electronics, this pedal is for you. The project was created with the aim of having fun and learning about guitar pedals. 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.
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. Pedal-Pi is a lo-fi programmable guitar pedal that works with the Raspberry Pi ZERO Board.
Pedal PI - Raspberry Pi ZERO Guitar Pedal.
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