#include <BluetoothSerial.h>

BluetoothSerial BT;

char dato;
int led=14;

void setup(){
BT.begin("ESP");
pinMode(led, OUTPUT);
}
void loop(){
  if(BT.available()){
    dato=BT.read();
    switch(dato){
      case"a":
      encender();
      break;
      case"s":
      apagar();
      break;
    }

  } 
}
void encender(){
  digitalWrite(14, HIGH)
}
void apagar(){
  digitalWrite(14, LOW)
}