const int ledVermelho = 11;
const int ledAmarelo = 10;
const int ledVerde = 9;

void piscaLed(int led, int espera){

  digitalWrite(led, HIGH);
  delay(espera);
  digitalWrite(led, LOW);

}

void setup() {
  
  pinMode(ledVermelho, OUTPUT);
  pinMode(ledAmarelo, OUTPUT);
  pinMode(ledVerde, OUTPUT);

}

void loop() {
  
  piscaLed(ledVermelho, 1000);
  piscaLed(ledAmarelo, 500);
  piscaLed(ledVerde, 2000);

}