#include <SoftwareSerial.h>
SoftwareSerial mySerial(3,4);
int valor;
void setup() {
  // put your setup code here, to run once:
  mySerial.begin(9600);
  pinMode(0,OUTPUT);  
}

void loop() {
  // put your main code here, to run repeatedly: 
  if (mySerial.available() > 0) {
    valor = mySerial.read();
  if (valor=='1'){
    digitalWrite(0,LOW);     
  }
  if (valor=='2'){
    digitalWrite(0,HIGH);        
  }
}
}