This page is a meeting place for people making synthesizers and music generators with Freeduinos and Arduinos .
From a post over on the monome forums, some single chip / open source synth projects:
AVR chip based designs:
Really simple project picaxe beatbox
Also interesting are these PARASITE modules, small audio modules intended to be added into circuit bent hardware. Of particular interest to me is the filter module, which is sadly sold out right now.
ok, that is it for now, just wanted to get this all in my database in case the monome forum goes down.
Here's a blurry picture of the synth
The covers are 1/4" lexan - sanded matt finish, held together with some 6/32 machine screws and spacers. Screws are just tapped into the front panel. The board is an Bare Bones Board
There's a four bit R2R ladder. I consider this an early prototype and much development is in order. The code doesn't address the R2R ladder yet.
I have developed a way of using the AD5206 digital potentiometer to control a number of oscillators (resistor-capacitor circuits), which makes it possible to easily have 6 voices (or more), with notes modified by ADSR envelopes.
Read about the project here Arduino polyphony
The OctoSynth is an 8 independent oscillator synthesizer running entirely in the Arduino, with no external components. The oscillator interrupt loop is a highly optimised wavetable sound generator, mostly written in inline assembler (it can run up to 16 oscillators if nothing else is being done). As well as the oscillators, there is also a software based resonant low pass filter, which is nice. Sound is output using 8 bit pulse-width-modulation on Pin 11.
Currently it is designed to be controlled in realtime using a bank of capacitive touch buttons connected to various input pins (I use carriage bolts as these buttons - any metal object would be fine) for 8 note keys, plus two more buttons for pitch bend and filter sweep.
Full source code available on the project page .
see the SID-emulator page for more infos
The Paia Fatman is a quite capable 2-osc analog monosynth with good modding potential, available as a kit. I replaced its obsolete 8031 (with assembler) controller with an Arduino. This gives a powerful analog sound similar to a Novation Basstation, but with easily-edited Midi control code, allowing sequencers, arpegiators etc. to be easily realised.
More info at http://sites.google.com/site/nibblernibbles/
A robust synthesizer from Modern Device that can be completely controlled by the on-board Arduino-compatible microcontroller. The Fluxamasynth is based on Atmel's ATSAM2195 single-chip MIDI sound system, which is part of their Dream Sound Synthesis line of programmable ICs. The Fluxamasynth has a built-in wavetable with 128 general MIDI sounds and an additional set of 128 variations and dozens of percussion sounds. It can play music in 64-voice polyphony without effects or 38 voices with effects.
FlexamySynth Library for Fluxamasynth
FlexamySynth is an Arduino library for the Fluxamasynth, that supports all the features of the versatile SAM2195. The whole 9 yards. It has a nice programming guide too (chm).