int portas[3]= {0, 1, 2};

void setup() {
  for(int i = 0; i < 3; i++){
    pinMode(portas[i], OUTPUT);
  }
  
}

void loop() {
  digitalWrite(portas[0], HIGH);
  delay(5000);
  digitalWrite(portas[0], LOW);
  digitalWrite(portas[1], HIGH);
  delay(3000);
  digitalWrite(portas[1], LOW);
  digitalWrite(portas[2], HIGH);
  delay(5000);
  digitalWrite(portas[2], LOW);
  delay(1);
}