Pulsing LED - Yellow LED [nolib]

const int yellowLED = 13;

void setup() {
  // put your setup code here, to run once:
  pinMode(yellowLED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 0; i < 255; i++) {
    analogWrite(yellowLED, i);
    delay(5);
  }
  for(int i = 255; i > 0; i--) {
    analogWrite(yellowLED, i);
    delay(5);
  }
}