CONTROLANDO_LED_PELA_SERIAL-_1_LIGA_E_2_DESL

int led = 9;
int numero = -1;

void setup(){
 pinMode(led,OUTPUT);
 Serial.begin(9600);
}

void loop(){
     if (Serial.available() > 0){
         numero = Serial.read();
        }

     if (numero == 49){
      digitalWrite(led,HIGH);
      Serial.println("Ligado");
      delay(200);
        }
   else
       if (numero == 48){
      digitalWrite(led,LOW);
      Serial.println("Desligado");
      delay(200);
        }

    numero = -1;

}