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f6abdd7c2b
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57e12d95fd
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@ -16,8 +16,8 @@ int note = 0;
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// int pitch[] = { 8, 4, 5, -1, 4, 3, -1, 2, 3, 4, -1, 6, 3, 4, 5, -1 };
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// float dur[] = { 0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.25, };
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int pitch[] = { 12, -1, 11, -1, 12, -1, 15, -1, 12, -1, 11, -1, -1, -1, -1, -1 };
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float dur[] = { 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0 };
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int pitch[] = { 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 0, -1, -1, -1 };
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float dur[] = { 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0 };
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int phrase = 16;
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@ -43,7 +43,7 @@ void setup() {
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//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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//OCR1A = 15624;
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OCR1A = 48000;
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OCR1A = 31248;
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// turn on CTC mode
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TCCR1B |= (1 << WGM12);
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// Set CS10 and CS12 bits for 1024 escaler
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@ -1,88 +0,0 @@
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// Basic demo for configuring the MCP4728 4-Channel 12-bit I2C DAC
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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// idea behind this - sequence a cloud of gate events
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float hexany[] = { 0.12928301694496647, 0.32192809488736235, 0.3923174227787603, 0.5849625007211562, 0.8073549220576041, 0.9068905956085185 };
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float tuning[18];
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int chord[10] = { 0, 2, 4, 6, 8, 7, 11, 15, 14, 10 };
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int bpm = 60;
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float beat_s = 60.0 / (float)bpm;
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int beat_m = round(1000.0 * beat_s);
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float mod_b = 3.141592653589793 / 4.0;
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float voltrange = 4.85; // measured this, probably not accurate
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float octave = 4096.0 / voltrange; // number of DAC steps in an octave
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int gate = 0;
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int gatel = 1000;
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int tick = 16;
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long init_t;
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float p_gate = 0.0;
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void setup(void) {
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Serial.begin(115200);
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while (!Serial)
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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if (!mcp.begin(0x64)) {
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Serial.println("Failed to find MCP4728 chip");
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while (1) {
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delay(10);
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}
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Serial.println("MCP4728 initialised");
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}
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float n0 = 0;
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for( int o = 0; o < 3; o++ ) {
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for( int i = 0; i < 18; i++ ) {
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tuning[o * 6 + i] = round(n0 + octave * (o + hexany[i]));
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}
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}
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init_t = millis();
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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void loop() {
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int note;
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int k = 0;
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if( gate > 0 ) {
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gate--;
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if( gate == 0 ) {
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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} else {
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long now = millis();
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long mod_t = now - init_t;
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tick--;
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if( tick == 0 ) {
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tick = 32;
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p_gate = sin(mod_b * (float)mod_t / (float)beat_m);
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}
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if( (float)random(10000) / 20.0 < abs(p_gate)) {
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if( p_gate > 0 ) {
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note = random(5);
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} else {
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note = 5 + random(5);
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}
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mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
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mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
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gate = gatel;
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}
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}
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}
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@ -1,109 +0,0 @@
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// can fibomod make an interesting noise?
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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#define nsamp 1500
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#define dacmax 256
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unsigned int phase = 0;
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unsigned int fibo = 3;
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unsigned int scale = 0;
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unsigned int fibi = 0;
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unsigned int gate = 4095;
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unsigned int pmax = nsamp;
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unsigned int beat = 0;
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unsigned int fibosort[] = { 4,3,11,8,29,7,21,19,38,76,5,55,199,6,9,12,16,18,24,36,48,72,144,13,22,31,44,62,124,47,141,17,34,68,136,152,15,33,41,123,165,205,58,116,211,89,139,14,23,28,32,42,46,56,63,69,84,92,96,112,126,138,161,168,184,207,224,252,101,151,233,39,87,59,10,20,40,61,88,110,122,155,220,244,248,71,27,51,54,57,102,107,108,114,153,171,204,214,216,228,37,113,79,158,35,77,105,231,26,52,104,232,43,129,181,209,64,94,188,192,25,53,106,109,212,218,121,49,91,147,203,229,30,45,60,66,80,82,90,93,99,120,132,164,176,180,183,186,198,240,246,131,178,67,201,65,143,145,119,133,189,238,73,149,202,111,235,78,83,117,156,166,174,208,234,249,118,236,179,85,95,170,187,190,191,128,97,75,103,142,81,159,162,74,148,226,177,239,70,115,140,154,160,210,217,230,241,253,251,221,247,127,86,172,137,195,213,219,50,100,200,237,157,163,242,98,167,182,196,173,135,255,169,185,193,197,175,134,130,215,146,223,222,227,125,245,194,150,225,206,243,254,250 };
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byte waveform[nsamp];
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void setup() {
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cli();
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//set timer1 interrupt at 1Hz
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TCCR1A = 0;// set entire TCCR1A register to 0
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TCCR1B = 0;// same for TCCR1B
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TCNT1 = 0;//initialize counter value to 0
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// set compare match register for 1hz increments
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//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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OCR1A = 3200;
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// turn on CTC mode
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TCCR1B |= (1 << WGM12);
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// Set CS10 and CS12 bits for 1024 prescaler
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TCCR1B |= (1 << CS12) | (1 << CS10);
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// enable timer compare interrupt
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TIMSK1 |= (1 << OCIE1A);
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sei();
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Serial.begin(115200);
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if (!mcp.begin(0x64)) {
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while (1) {
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delay(100);
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}
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}
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mcp.setSpeed(800000L);
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for( int i = 0; i < nsamp; i++ ) {
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waveform[i] = 1;
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}
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fibi = 3;
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fibo = 3; //fibosort[fibi];
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setwave();
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}
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void setwave(){
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waveform[0] = 0;
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waveform[1] = 1;
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fibo = fibi; // fibosort[fibi];// + 3;
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pmax = nsamp;
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for (int i=2; i<nsamp; ++i){
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waveform[i] = (waveform[i - 1] + waveform[i - 2]) % fibo;
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if( waveform[i - 1] == 0 && waveform[i] == 1 ) {
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pmax = i - 1;
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break;
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}
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}
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float scale = 256 / fibo;
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for( int i = 0; i < nsamp; ++i ) {
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waveform[i] *= scale;
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}
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}
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ISR(TIMER1_COMPA_vect){//timer1
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fibi++;
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if( fibi == 67 ) {
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fibi = 3;
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}
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setwave();
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phase = 0;
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beat++;
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if ( beat == 4 ) {
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gate = 4095;
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beat = 0;
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}
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}
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void loop() {
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mcp.fastWrite(waveform[phase] << 4, gate, 0, 0);
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phase += 1;
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if( phase == pmax ) {
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phase = 0;
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gate = 0;
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}
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}
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@ -4,5 +4,3 @@ Looptober 2024
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This year for Looptober I decided to use my Arduino (in combination with my
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modular synth rack) for every track. The source code for each day's track
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is here and the tracks are on [my Funkwhale server](https://music.mikelynch.org/library/albums/31/)
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32
TODO.md
32
TODO.md
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@ -1,35 +1,11 @@
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## TODO
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6 October
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Sunday 6 October
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s 6 - Wavetable updates
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m 7 - Change a sequence while it's playing
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t 8 - Sound clouds
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w 9 - 7TET groove
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t 10 - Drum pattern
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f 11 - Scratchy karplus-strong beats
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s 12 - sequencer 2
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s 13 - accidental FM synth
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m 14 - slow dank
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t 15 - rattatat
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w 16 -
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t 17
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f 18
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s 19
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s 20
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m 21
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t 22
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w 23
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t 24
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f 25
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s 26
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s 27
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m 28
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t 29
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w 30
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t 31
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More ideas
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deliberate FM synthesis
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KR to AR modulation and back
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Envelopes
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f 11 - FM
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s 12 - Karplus-Strong
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