int LED_1 = 2;
int LED_2 = 3;
int LED_3 = 4;
int LED_4 = 5;
int LED_5 = 6;
int LED_6 = 7;
int LED_7 = 8;
int LED_8 = 9;

void setup() {
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
  pinMode(LED_3, OUTPUT);
  pinMode(LED_4, OUTPUT);
  pinMode(LED_5, OUTPUT);
  pinMode(LED_6, OUTPUT);
  pinMode(LED_7, OUTPUT);
  pinMode(LED_8, OUTPUT);
}
void loop() {
  for (int i = 2; i <= 9; i++) {
    digitalWrite(i, HIGH); // Enciende el LED correspondiente al pin i
    delay(500); // Espera 500 milisegundos
    digitalWrite(i, LOW); // Apaga el LED correspondiente al pin i
  }
}