66 lines
1.2 KiB
Arduino
66 lines
1.2 KiB
Arduino
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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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// 1 3 5 7 hexany log2
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int bpm = 135;
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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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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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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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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 = 16;
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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) / 100.0 < abs(p_gate)) {
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mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
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gate = gatel;
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}
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}
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}
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