#define VD 2
#define AM 3
#define VM 4

void setup() {
  pinMode(VD, OUTPUT);
  pinMode(AM, OUTPUT);
  pinMode(VM, OUTPUT);

}

void loop() {
  //Semaforo Vermelho
  digitalWrite(VM, HIGH);
  digitalWrite(VD, LOW);
  digitalWrite(AM, LOW);
  delay(2000);

  //Semaforo Verde
  digitalWrite(VM, LOW);
  digitalWrite(VD, HIGH);
  digitalWrite(AM, LOW);
  delay(3000);

  //Semaforo Amarelo
  digitalWrite(VM, LOW);
  digitalWrite(VD, LOW);
  digitalWrite(AM, HIGH);
  delay(1000);

}