void setup() {
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
}

void loop() {
  //arriba a abajo
  for(int pin= 2; pin <7; pin=pin +1){
digitalWrite(pin, HIGH);
delay(100);
digitalWrite(pin, LOW);
delay(100);
  }

  // ENCIENDEN TODOS
  for (int pin=2; pin <7; pin=pin +1){
digitalWrite(pin, HIGH);

  }
  delay(500);
  for(int pin= 2; pin < 7; pin=pin +1){
    digitalWrite(pin, LOW);
  }
delay(500);
  
  //abajo a arriba
  for(int pin= 7; pin>1; pin=pin -1){
digitalWrite(pin, HIGH);
delay(100);
digitalWrite(pin, LOW);
delay(100);
  }
}