Arduino - Ventilator brzine

void setup() {
  pinMode(8, INPUT_PULLUP);
}

int counter = 0;
void loop() {
  if(digitalRead(8) == 0) {
    counter ++;
    delay(500);
  }

    if( counter == 0) {
      analogWrite(11, 0);
    }
    else if( counter == 1) {
      analogWrite(11, 100);
    }
    else if( counter == 2) {
      analogWrite(11, 150);
      analogWrite(6, 255);
    }
    else if( counter > 3) {
      analogWrite(11, 255);
      counter = 0;
  }
}