43 lines
937 B
Arduino
43 lines
937 B
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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int tuning[13];
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int scale[] = { 0, 4, 7, 9, 12 };
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float voltrange = 5.0; // 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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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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Serial.println(octave);
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float n0 = 2048;
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for( int i = 0; i < 13; i++ ) {
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tuning[i] = round(n0 + octave * (float)i / 12);
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Serial.println(tuning[i]);
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}
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}
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void loop() {
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for( int i = 0; i < 5; i++ ) {
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mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[scale[i]]);
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delay(200);
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}
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}
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