#define LED_ROJO 7
#define LED_AMARILLO 6
#define LED_VERDE 5

void setup() {
  // put your setup code here, to run once:
pinMode(LED_ROJO,OUTPUT);
pinMode(LED_AMARILLO,OUTPUT);
pinMode(LED_VERDE,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(LED_VERDE,HIGH);
digitalWrite(LED_AMARILLO,LOW);
digitalWrite(LED_ROJO,LOW);
delay(3000);

digitalWrite(LED_VERDE,LOW);
digitalWrite(LED_AMARILLO,HIGH);
delay(1000);

digitalWrite(LED_AMARILLO,LOW);
digitalWrite(LED_ROJO,HIGH);
delay(3000);
}