// Define the pin used for our LED
int ledPin = 11;

// The setup () function only runs when the program starts
void setup() {
 // Initilize the digital pin LED_BUILTIN as output
pinMode(ledPin, OUTPUT);
}

// The loop() function runs infinitely
void loop() {

  // Fade in
  for(int ledVal = 0; ledVal <= 255; ledVal +=1) {
    analogWrite(ledPin, ledVal);
    delay(25);
  }

 // Fade uit
 for(int ledVal = 255; ledVal >= 0; ledVal -=1) {
  analogWrite(ledPin, ledVal);
  delay(25);
 }

  // Pause for 1 second (1000 milliseconds)
  delay(1500);
  
}