Collection of sketches for ATTiny that can be used to replace logic blocks in your circuits. Mostly, these are squarewave sketches so they can easily be used in lunetta-like circuits running 0 to 5 volts. There are plenty of PWM/Analog sketches though too.
Create a library of Arduino sketches that can be loaded on ATTiny AVR micro controllers to use in lo-fi synth/noise circuits.
They can either replace a block of logic or create a new type of circuit altogether. The intent is not to create a synth on a chip, but rather to have a series of building blocks to create richer devices with an actual lower device count. Rather than write the code to tailor the circuit, these are a prewritten library of sketches that can be used to plug into your breadboard or whatever. Kinda like if you discovered a whole new series of CMOS chips like the 4000 series.
Of course, these are really 8-bit microcontroller chips with limitations such as speed, quantization and code quirks.
I am focusing on ATTiny85, 84 and 2313 for the most part. Again, these are components, not full blown synth on a chip things. But you can get a lot of sound from a minimal part count.
There are other plenty of projects out there with similar concepts. I draw inspiration from everything and hope that in some little way, someone can draw inspiration from my ramblings.
MiniMoSynth A Formfactor and open source/open hardware design to make ATTiny Blocks. Certainly the closest to what I have here. I do not really have a consistant strategy nor a consistant input like these little blocks. Check em out.
Rad-fi System from Bleep Labs Uses Arduinos as building blocks for Synths on a breadboard. A collection of ATTiny micros with these sketches would be completely compatible with this system.
Bastl Kastle uses 2 ATTiny85s that can be programmed with other features.
Electric Druid has some AVRs and others as building blocks. For example, an LFO.
Moffenzeefmodular has a project called MSG. One of these sketches has made its way into that. Neat! If your not solder/hardware inclined, just get this and stick that that form factor. Looks solid, if its not sold out.
https://noisio.de/de Not sure, but there appears to be projects in the same direction
https://github.com/strickyak/jerboa-attiny85-mod-synth Jerboa Modular Synth blocks. Very similar goals to this.
Ability to program ATTiny chips. This only requires an arduino uno, a breadboard and a handful of ATTiny85s to get started. There are plenty of sites that walk you through those steps. If you have only unos or nanos, these sketches might be workable, but keep in mind that in many cases, Im using chip specific timers and interrupt pins. Translating to nano/uno is certainly a workable problem that will tech you a LOT should you want to go that route.
In some cases, a few extra parts might be needed like a small PWM filter or R2R ladder. These will be kept at a minimum unless the focus of the sketch IS an interface chip ( think optical encoder, Digital Pot controller and so on)
There are SOME common layout patterns, but alas, I tend to play more to the strengths of the GPIO as each sketch needs it.
- Clock inputs are usually int0 ( pin7 ), because that is where rising/falling interrupt is.
- Analog writes are usually on pins 5/6 because that can be set to be FAST.
- I generally do not use delay() or millis(), prefering to write my own so i can choose timers.
- Older sketches use more counters rather than DDS. Feel free to pick and choose the best parts.
There are a few that I have made Modular Circuit boards from
🎇 Sequencer FF - This is a format used by the Turning Sketch. It has 1 Pot, 2 Digitalish inputs ( one is usually a clock ) and 2 outputs. One is Usually PWM filterd and the other a trigger out.
🗿 - TODO
🐓 - TODO
I have a numbering system so I can halfway keep these things in order. Its more of a guideline.
| Number | Class | Description |
|---|---|---|
| 000-199 - Oscillators, Vco, LFO | ||
| ACS-85-0001 | Oscillator | Fixed squarewave oscillator with High and Low Frequencies and a Ramp |
| ACS-85-0002 | VCO | Two square wave vcos and a two tone out pin |
| ACS-85-0003 | VCO | Two Tone VCO with speed |
| ACS-85-0004 | VCO | Two Freq VCO with Range (lfo to hf) |
| ACS-85-0005 | VCO | Three Freq VCO detuned |
| ACS-85-0006 | VCO | VCO with random period |
| ACS-85-0007 | VCO | VCO with ramping period |
| ACS-85-0008 | VCO | VCO with adjustable period/vibrato |
| ACS-85-0010 | LFO PWM | Sine, tri, ramp up, ramp down |
| ACS-85-0011 | LFO PWM | Random values (like psycho) |
| ACS-85-0012 | LFO PWM | Random values 2 (like psycho) |
| ACS-85-0015 | LFO | 2 Squarewave LFOs |
| ACS-85-0016 | Clock | 4 Bit Clock/counter |
| ACS-85-0017 | Clock | Baby 4 ( CD4017) |
| ACS-85-0020 | LFO | Adjustable Squarewave |
| ACS-85-0030 | LFO PWM | Four LFO with Pauses |
| ACS-85-0031 | LFO PWM | 3 Phase LFO clocked |
| ACS-85-0032 | LFO PWM | Clocked LFO |
| ACS-85-0034 | LFO PWM | Lorenz Attractor |
| ACS-85-0040 | VCO | Squarewave VCO with Chiptune and PWM |
| ACS-85-0041 | VCO | Squarewave VCO with PWM |
| ACS-85-0042 | VCO | Squarewave VCO with Chiptune |
| ACS-85-0050 | VCO PWM | Sinewave VCO PWM with distortion - in progress |
| ACS-85-0060 | VCO | Squarewave with LFO detuned frequency |
| ACS-85-0061 | VCO | Squarewave with LFO PWM frequency |
| ACS-85-0065 | VCO | Dual XOR Drones |
| ACS-85-0066 | VCO | Drones root-oct-fifth with detune |
| ACS-85-0080 | Noise | Squarewave Noise Tunable 2 outputs |
| ACS-85-0100 | Squarewave | Debounced Sound generator |
| ACS-85-0101 | Squarewave | Algoritmic Sound. Blips and Bleeps. |
| ACS-85-0102 | Squarewave | Synthdrum 1 |
| ACS-85-0103 | Squarewave | Randdrum 1 |
| ACS-85-0105 | PWM | Cowbell 1 |
| ACS-85-0106 | PWM | Cowbell XOR |
| ACS-85-0110 | Drum PWM | Jan Ostman High Hat 🎇 |
| ACS-85-0111 | Drum PWM | Jan Ostman Snare 🎇 |
| ACS-85-0120 | VCO PWM | Phase Distortion 1 |
| ACS-85-0121 | VCO PWM | Phase Distortion Chainsaw |
| ACS-85-0122 | VCO PWM | Phase Distortion xy |
| ACS-85-0124 | VCO PWM | Phase Distortion Chain/sine TODO |
| ACS-85-0125 | VCO PWM | Phase Distortion Chainsaw - v/oct |
| ACS-85-0130 | VCO PWM | Super Square - v/oct |
| 200-299 Envelope generators, VCA, Sample and Hold | ||
| ACS-85-0200 | VCA | Simple VCA - PWM - In progress |
| ACS-85-0201 | VCA + AR | Simple VCA AR Envelope - PWM - In progress |
| ACS-85-0210 | VCO with S&H | VCO with two register delays |
| ACS-85-0220 | Debounce gate | Debounced Gate with Repeat |
| 300-499 Modulation. Adders, Mixers, dividers, Multiplexers, Gates, Vibrato | ||
| ACS-85-0305 | Gates | Xor Gates (2) |
| ACS-85-0306 | Gates | Nand Gates (2) |
| ACS-85-0307 | Gates | Or/And gate |
| ACS-85-0308 | Gates | Pick a Gate (and/or/nand/xor) |
| ACS-85-0320 | Counter | Divide by 3,5,7,9 |
| ACS-85-0321 | Counter | Divide by 2,3,4,5 |
| ACS-85-0322 | Counter | Divide by N |
| ACS-85-0350 | Modulation | Harmonizer |
| ACS-85-0351 | Modulation | Detune |
| ACS-85-0352 | Modulation | Vibrato (ramp) |
| ACS-85-0353 | Modulation | Modulate LFSR |
| ACS-85-0360 | Modulation | Selectable Counter-Divider |
| ACS-85-0370 | Counter | Clock Divider 🎇 |
| ACS-85-0375 | Counter | Euclidian Clock Divider 🎇 |
| 500-699 Shift, Delay, Melody Makers, Atari Punk Console | ||
| ACS-85-0500 | Component | Atari Punk Console |
| ACS-85-0501 | Component | Atari Punk Console 2 |
| ACS-85-0505 | Component | Nand synth |
| ACS-85-0506 | Component | Nand DX |
| ACS-85-0510 | Shift Register | Simple 16 bit Shift Register |
| ACS-85-0511 | Shift Register | Variable 32 bit Shift Register |
| ACS-85-0512 | Shift Register | Large 128 bit Shift Register |
| ACS-85-0520 | Shift Register | Clocked 16 bit LFSR |
| ACS-85-0521 | Shift Register | Variable speed 16 bit LFSR |
| ACS-85-0522 | Shift Register | Variable low speed 16 bit LFSR |
| ACS-85-0530 | Component | Drunk Walk |
| ACS-85-0540 | Component | 4 Vco with LFO on/off |
| ACS-85-0550 | Component | Melody Maker Upper 1 |
| ACS-85-0551 | Component | Melody Maker Upper 2 |
| ACS-85-0552 | Component | Melody Maker Upper 3 |
| ACS-85-0560 | Component | Freq sampler |
| ACS-85-0570 | Shift Register | Analog Shift Register variable size |
| ACS-85-0600 | LFO - Sequencer | Sequencer programmable LFO |
| ACS-85-0601 | Sequencer | 1 bit 3 Pin Sequencer with analog scene select |
| ACS-85-0603 | Sequencer | 2 Channel Drum Pattern Triggers |
| ACS-85-0604 | Sequencer | 3 Channel Random Drum Triggers |
| ACS-85-0605 | Sequencer | 1 bit waveform generator |
| ACS-85-0607 | Sequencer | 4 Channel Random Drum Triggers |
| ACS-85-0608 | Sequencer | 4 Channel Random Drum Triggers clocked |
| ACS-85-0609 | Sequencer | 3 Channel Drum Patterns |
| ACS-85-0610 | Sequencer | clock counter quadrature/seqs |
| ACS-85-0612 | Random | Clocked Coin Flip trigged-latch |
| ACS-85-0613 | Random | Clocked Coin Flip gate |
| ACS-85-0614 | Random | Clocked mulitple Coin Flip gate |
| ACS-85-0615 | Random | Clocked Probablity Gate |
| ACS-85-0616 | Random | Delayed Probablity Gate 🎇 |
| ACS-85-0617 | Random | Probability Drop Gate 🎇 |
| ACS-85-0620 | Envelope Random | Trigger to Gate / Random width 🎇 |
| ACS-85-0621 | Gate | Timed gate 🎇 |
| ACS-85-0625 | Sequencer | Burst Generator |
| ACS-85-0626 | Sequencer | Burst Generator 2 |
| ACS-85-0627 | Sequencer | Random Burst Generator |
| ACS-85-0630 | Sequencer | Turning Style sequencer 🎇 |
| ACS-85-0641 | Sequencer | AfroCuban beats 🎇 |
| ACS-85-0650 | ByteBeat | BitBeat v1 |
| ACS-85-0651 | ByteBeat | BitBeat v2 |
| ACS-85-0652 | ByteBeat | BitBeat clocked |
| ACS-85-0653 | ByteBeat | BitBeat select |
| ACS-85-0660 | VCO PWM | 3 Tones with Patterns |
| ACS-85-0675 | Counter | Euclidian counter |
| 700-899 Interface, Control, Midi, Visualization | ||
| ACS-85-0700 | Controller | Analog to Digital Decoder. Translate Analog to either 3 bits or single pins |
| ACS-85-0705 | Controller | Two pin Tap Tempo |
| ACS-85-0710 | Controller | Button Select 3 pin |
| ACS-85-0711 | Controller | Button Select 3 pin binary |
| ACS-85-0750 | I2C | Single Byte I2c Master fetch |
| ACS-85-0751 | I2C | Button Byte I2c Client |
| ACS-85-0752 | I2C | Rotory Byte I2c Client |
| 900-999 Other |
| Number | Type | Description |
|---|---|---|
| 000-199 - Oscillators, Vco, LFO | ||
| ACS-84-0001 | Oscillator | Fixed square wave oscillator with High and Low Frequencies and a Ramp and Triangle |
| ACS-84-0010 | Oscillator | Fixed square wave oscillator with a grand assortment of beeps. |
| 300-499 Modulation. Adders, Mixers, dividers, Multiplexers, Gates, Vibrato | ||
| ACS-84-0305 | Gates | Xor Array |
| ACS-84-0570 | Shift Register | Analog Shift Register 4 outputs |
| ACS-84-0608 | Sequncer | clocked 4 Channel random triggers |