void setup() {

// PIN 2 COLOR VERDE
// PIN 3 COLOR AMARILLO
// PIN 4 COLOR ROJO

pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
}
void loop() {
 // put your main code here, to run repeatedly

 digitalWrite(2, HIGH);
 delay((500));
 digitalWrite(2, LOW);
 delay(500);                               
                                            
  digitalWrite(3, HIGH);
 delay((500));
 digitalWrite(3, LOW);
 delay(500);
                                                            
  digitalWrite(4, HIGH);
 delay((500));
 digitalWrite(4, LOW);
 delay(500);
                                              
}