Semáforo Arduino

//Semaforo
//Fernando Ferreira Silva, 09/06/2014
//Licença: GPL
int ledDelay = 10000;
int p_verm = 10;
int p_ama = 9;
int p_verde = 8;

void setup (){
     pinMode(p_verm, OUTPUT);
     pinMode(p_ama, OUTPUT);
     pinMode(p_verde, OUTPUT);
}

void loop(){
     digitalWrite(p_verm, HIGH);
     delay(ledDelay);
     digitalWrite(p_verm, LOW);
     digitalWrite(p_verde, HIGH);
     delay(ledDelay);
     digitalWrite(p_verde, LOW);
     digitalWrite(p_ama, HIGH);
     delay(2000);
     digitalWrite(p_ama, LOW);
}