Initial Commit

Java/Processing/processing-3.3.6/modes/java/libraries/io/examples/I2CDigitalAnalogOOP/I2CDigitalAnalogOOP.pde

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+import processing.io.*;
+MCP4725 dac;
+
+void setup() {
+  //printArray(I2C.list());
+  dac = new MCP4725(I2C.list()[0], 0x60);
+}
+
+void draw() {
+  background(map(mouseX, 0, width, 0, 255));
+  dac.setAnalog(map(mouseX, 0, width, 0.0, 1.0));
+}

Java/Processing/processing-3.3.6/modes/java/libraries/io/examples/I2CDigitalAnalogOOP/MCP4725.pde

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+import processing.io.I2C;
+
+// MCP4725 is a Digital-to-Analog converter using I2C
+// datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22039d.pdf
+
+class MCP4725 extends I2C {
+  int address;
+
+  // there can be more than one device connected to the bus
+  // as long as they have different addresses
+  MCP4725(String dev, int address) {
+    super(dev);
+    this.address = address;
+  }
+
+  // outputs voltages from 0V to the supply voltage
+  // (works with 3.3V and 5V)
+  void setAnalog(float fac) {
+    fac = constrain(fac, 0.0, 1.0);
+    // convert to 12 bit value
+    int val = int(4095 * fac);
+    beginTransmission(address);
+    write(val >> 8);
+    write(val & 255);
+    endTransmission();
+  }
+}