Programa

int Valor = 0;
int Sensor = 8;
int LedVerde = 13;
int LedAmarillo = 12;
 
void setup(){
	Serial.begin(9600);
	pinMode(Sensor, INPUT);
	pinMode(LedVerde, OUTPUT);
	pinMode(LedAmarillo, OUTPUT);
}
 
void loop(){
	Valor = digitalRead(Sensor);
	Serial.println(Valor);
	delay(100);
	if (Valor == 0)
	{
		digitalWrite(LedVerde, HIGH);
		digitalWrite(LedAmarillo, LOW);
	}
	else
	{
		digitalWrite(LedVerde, LOW);
		digitalWrite(LedAmarillo, HIGH);
	}
}