Arduino I2C MIDI Interface

This is one of those "I wonder if..." projects. There is little reason for anyone to really do this, but I have a board that only has I2C for IO and naturally I got wondering if it was possible to do MIDI over the I2C interface. This is starting simply, trying it with a standard … Continue reading Arduino I2C MIDI Interface →

Raspberry Pi Pico Multi MIDI Router

In this project I've combined my Raspberry Pi Pico MIDI Channel Merger and my Raspberry Pi Pico MIDI Channel Router to create a more general 6-IN, 6-OUT MIDI routing device. This project uses the two hardware UARTs on a Raspberry Pi Pico along with four "PIO" UARTs to give the six MIDI IN and OUT ports. Part … Continue reading Raspberry Pi Pico Multi MIDI Router →

Raspberry Pi I2S Audio Interface

This post looks at how to use a cheap I2S digital to analog converter as the audio output interface for a Raspberry Pi V1 model B and a Raspberry Pi Zero V1. As I mentioned last time, there are a number of ready-made "off the shelf" add-on boards you can get for the Raspberry Pi … Continue reading Raspberry Pi I2S Audio Interface →

Raspberry Pi Zero PWM Audio Interface

The Raspberry Pi Zero (I'm talking about V1 here, with no wireless. At the time of writing, V2 has just been released and I've yet to have a play with that!) has capabilities on par with the first generation "full" Raspberry Pi, so I was keen to try my “Bare Metal” Raspberry Pi Synth on one. … Continue reading Raspberry Pi Zero PWM Audio Interface →

Raspberry Pi v1 Model B Synth Board

If you've been following along, you'll know I've been playing around with an original Raspberry Pi v1 model B as the engine for some digital sound synthesis. This is a slight project tangent to build an analog IO and MIDI add-on board. Note that this does not conform to any standard for Raspberry Pi add-ons … Continue reading Raspberry Pi v1 Model B Synth Board →

“Bare Metal” Raspberry Pi Synth – Part 3

This project uses an off-the-shelf analog IO board for the Raspberry Pi for my "bare metal" Raspberry Pi v1 (model B) synth. Full index of posts in this series: Part 1: The basics of setting up an environment to build a “bare metal” Raspberry Pi synth application. Part 2: Adding potentiometer controls via an MCP3008 … Continue reading “Bare Metal” Raspberry Pi Synth – Part 3 →

“Bare Metal” Raspberry Pi Synth – Part 2

This post builds on part 1 and starts to add some IO handling code and simple synthesis code to the bare metal Raspberry Pi experiments. Full index of posts in this series: Part 1: The basics of setting up an environment to build a “bare metal” Raspberry Pi synth application. Part 2: Adding potentiometer controls … Continue reading “Bare Metal” Raspberry Pi Synth – Part 2 →

“Bare Metal” Raspberry Pi Synth

The Raspberry Pi is an "SBC" - a single board computer, whilst the Arduino (and the Raspberry Pi Pico for that matter) is a microcontroller. Simplistically a single board computer is, well, what most people would think of when they think about a computer - a board (with or without a case!) that you plug … Continue reading “Bare Metal” Raspberry Pi Synth →

Auduino Slider Waveform Granular Synthesis

Now I have a version of the Auduino that will use a wavetable as the grain for the granular synthesis, I can start some alternative experiments, so first of all I thought I would try to use my slider potentiometers to build the wavetable. https://youtu.be/HABkDbIHvO8 Warning! I strongly recommend using old or second hand equipment … Continue reading Auduino Slider Waveform Granular Synthesis →

Auduino Wavetable Granular Synthesis

The original Auduino used a clever trick to efficiently calculate a triangle wave to use as the "grain" for the granular synthesis, but I always wanted to try it with a wavetable to see if that would work. This project gives that a go. https://youtu.be/qA2BzSjeX1U Warning! I strongly recommend using old or second hand equipment … Continue reading Auduino Wavetable Granular Synthesis →