arduino-modular/Sequencer/Sequencer.ino

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2023-12-09 22:18:00 +00:00
// Basic demo for configuring the MCP4728 4-Channel 12-bit I2C DAC
#include <Adafruit_MCP4728.h>
#include <Wire.h>
Adafruit_MCP4728 mcp;
int tuning[15];
int edo = 7;
int sequence[] = { 0, 0, 3, 0, 5, 0, 7, 2, 0, 0, 3, 0, 5, 0, 7, 6 };
float voltrange = 5.0; // measured this, probably not accurate
float octave = 4096.0 / voltrange; // number of DAC steps in an octave
void setup(void) {
Serial.begin(115200);
while (!Serial)
delay(10); // will pause Zero, Leonardo, etc until serial console opens
if (!mcp.begin(0x64)) {
Serial.println("Failed to find MCP4728 chip");
while (1) {
delay(10);
}
Serial.println("MCP4728 initialised");
}
mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
float n0 = 0;
for( int i = 0; i < 15; i++ ) {
tuning[i] = round(n0 + octave * (float)i / (float)edo);
Serial.println(tuning[i]);
}
}
void loop() {
for( int i = 0; i < 16; i++ ) {
note(sequence[i], 250);
}
}
void note(int note, int dur) {
int pot = analogRead(A0);
float gate = (float)pot / 1024.0;
mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
delay(round(gate * (float)dur));
mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
delay(round((1 - gate) * (float)dur));
}