//BORIS FROILAN HUANCA GONZALES
//declaramos las variables a usarse
int tiempo = 90;
byte led[8] = {2, 3, 4, 5, 6, 7, 8, 9};
byte pin;

void setup()
{
  //declaramos a los pines del array led[] como salida
  for (pin = 0; pin < 8; pin++)
  {
    pinMode(led[pin], OUTPUT);
  }
}

void loop()
{
  //secuencia N°1
  for (byte s1 = 0; s1 < 5; s1++)
  {
    for (int i = 0; i < 8; i++)
    {
      digitalWrite(led[i], HIGH);
      delay(tiempo);
      digitalWrite(led[i], LOW);
    }
    leds_off();
  }

  //secuencia N°2
  for (byte s2 = 0; s2 < 5; s2++)
  {
    for (int j = 7; j >= 0; j--)
    {
      digitalWrite(led[j], HIGH);
      delay(tiempo);
      digitalWrite(led[j], LOW);
    }
    leds_off();
  }

  //secuencia N°3
  for (byte s3 = 0; s3 < 5; s3++)
  {
    int k;
    for (k = 0; k < 7; k++)
    {
      digitalWrite(led[k], HIGH);
      delay(tiempo);
      digitalWrite(led[k], LOW);
    }
    for (k = 6; k > 0; k--)
    {
      digitalWrite(led[k], HIGH);
      delay(tiempo);
      digitalWrite(led[k], LOW);
    }
    digitalWrite(led[0], HIGH);
    delay(tiempo);
    leds_off();
  }

  //secuencia N°4 tomando en cuenta la sentencia Case:
  for (byte s4 = 0; s4 < 5; s4++)
  {
    for (int n = 0; n < 4; n++)
    {
      switch (n)
      {
        case 0:
          digitalWrite(led[0], HIGH);
          digitalWrite(led[7], HIGH);
          digitalWrite(led[3], LOW);
          digitalWrite(led[4], LOW);
          break;

        case 1:
          digitalWrite(led[1], HIGH);
          digitalWrite(led[6], HIGH);
          digitalWrite(led[0], LOW);
          digitalWrite(led[7], LOW);
          break;

        case 2:
          digitalWrite(led[2], HIGH);
          digitalWrite(led[5], HIGH);
          digitalWrite(led[1], LOW);
          digitalWrite(led[6], LOW);
          break;

        case 3:
          digitalWrite(led[3], HIGH);
          digitalWrite(led[4], HIGH);
          digitalWrite(led[2], LOW);
          digitalWrite(led[5], LOW);
          break;
      }
      delay(150);
    }
    leds_off();
  }
}

//función que apaga todos los leds
void leds_off()
{
  for (int f = 0; f < 8; f++)
  {
    digitalWrite(led[f], LOW);
  }
  delay(150);
}