#include <Wire.h>
#include "MCP4725.h"

MCP4725 DAC1(0x60);
MCP4725 DAC2(0x61);

float output1 = 0;
float output2 = 5.1;

void setup() {
  Wire.begin();
  DAC1.begin();
  DAC2.begin();
  DAC1.setMaxVoltage(5.1);
  DAC2.setMaxVoltage(5.1);
}

void loop() {
  if (output1 < 5.1) {
    output1 += 0.1;
  } else {
    output1 = 0;
  }
  DAC1.setVoltage(output1);
  
  if (output2 > 0) {
    output2 -= 0.1;
  } else {
    output2 = 5.1;
  }
  DAC2.setVoltage(output2);
  delay(1);
}