34 lines
669 B
Arduino
34 lines
669 B
Arduino
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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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long int last_
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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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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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void loop() {
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int pot = analogRead(A0);
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float rate = 2000 * (float)pot / 1024.0 + 0.01;
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long int t = millis();
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float v = 0.5 + 0.5 * sin((float)t / rate);
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mcp.setChannelValue(MCP4728_CHANNEL_A, round(v * 4095));
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}
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