41 lines
891 B
C++
41 lines
891 B
C++
// 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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float xlog = 0.5;
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float r = 3.783423;
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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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Serial.println("Adafruit MCP4728 test!");
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// Try to initialize!
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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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}
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mcp.setChannelValue(MCP4728_CHANNEL_A, 4095);
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mcp.setChannelValue(MCP4728_CHANNEL_B, 2048);
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mcp.setChannelValue(MCP4728_CHANNEL_C, 1024);
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mcp.setChannelValue(MCP4728_CHANNEL_D, 0);
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}
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void loop() {
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int pot = analogRead(A0);
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r = (float)pot / 1024.0 + 3.0;
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xlog = r * xlog * (1 - xlog);
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int cv = round(xlog * 4095.0);
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mcp.setChannelValue(MCP4728_CHANNEL_A, cv);
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}
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