Programa 8

Ascender leds com Arduino usando Array

int pinLed[9] = {12,11,10,9,8,7,6,5,4};
int numeroLed;

void setup() {
  int x;

  for(int x = 0; x <= 0; x++){
    pinMode(pinLed[x], OUTPUT);
  }

}

void loop() {
  numeroLed = 0;

  while (numeroLed <= 8){
    digitalWrite(pinLed[numeroLed], HIGH);
    delay(50);

    numeroLed += 1;
  }

  numeroLed = 8;
  while(numeroLed >= 0){
    digitalWrite(pinLed[numeroLed], LOW);
    delay(500);

    numeroLed -= 1;
  }
}

Créditos para https://cursodearduino.net/