void setup() {
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(6, OUTPUT);
}

 

void loop() {

  for (int i = 0; i <1; i++) {
      digitalWrite(11, HIGH);
      delay(500);
      digitalWrite(11, LOW);
      delay(500);
    }

  for (int i = 0; i <1; i++) {
      digitalWrite(10, HIGH);
      delay(500);
      digitalWrite(10, LOW);
      delay(500);
    }

  for (int i = 0; i <1; i++) {
      digitalWrite(9, HIGH);
      delay(500);
      digitalWrite(9, LOW);
      delay(500);
    }

  for (int i = 0; i <1; i++) {
      digitalWrite(6, HIGH);
      delay(500);
      digitalWrite(6, LOW);
      delay(500);
    }

 

    }