int led = 11;
int button = 8;
const int fade = 10;

void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT);
  digitalWrite(led, LOW);
}

void loop() {
  if (digitalRead(button) == HIGH) {
    delay(15);
    fadeLights();
  } else {
    digitalWrite(led, LOW);
  }
}

void fadeLights() {
  for (int j=0; j<=5; j++){
    //led
    for (int i = 0; i <= 255; i++) {
      analogWrite(led, i);
      delay (fade);
    }
    {
      delay (3000);
    }
    for (int i = 255; i >= 0; i--) {
      analogWrite(led, i);
      delay (fade);
    }
    {
      delay (3000);}
  }
}