void setup() {
  pinMode(27, OUTPUT); // Required for PWM
  //no setup neccesary for DAC pins
}

void loop() {
  // ramp from 0 to 255
  for (int val = 0; val<= 255; val++) {
    dacWrite(25, val);
    analogWrite(27, val);
    delay(10); // this speeds up the simulation
  } 
// Turn off
  dacWrite(25, 0);
  analogWrite(27, 0);
  delay(250);
}