// Basic Bluetooth sketch HC-05_03 Using the state pin 
// Connect the HC-05 module and communicate using the serial monitor
//
// The HC-05 defaults to communication mode when first powered on.
// The default baud rate for communication mode is 9600
//
 
#include <SoftwareSerial.h>
SoftwareSerial BTserial(2, 3); // RX | TX
SoftwareSerial mySerial2(11, 10);
// Connect the HC-05 TX to Arduino pin 2 RX. 
// Connect the HC-05 RX to Arduino pin 3 TX through a voltage divider.
// Connect the HC-05 STATE pin to Arduino pin 4.
//
 
char c = ' ';
char letra;
int LED  =  12;
 
// BTconnected will = false when not connected and true when connected
boolean BTconnected = false;
 
// connect the STATE pin to Arduino pin D4
const byte BTpin = 9;
 
 
void setup() 
{
    // set the BTpin for input
    pinMode(BTpin, INPUT);   
 
    // start serial communication with the serial monitor on the host computer
    Serial.begin(9600);
    Serial.println("Arduino is ready");
    Serial.println("Connect the HC-05 to an Android device to continue");
 
    // wait until the HC-05 has made a connection
    while (!BTconnected)
    {
      if ( digitalRead(BTpin)==HIGH)  { BTconnected = true;};
    }
 
    Serial.println("HC-05 is now connected");
    Serial.println("");
 
    // Start serial communication with the bluetooth module
    // HC-05 default serial speed for communication mode is 9600 but can be different
    BTserial.begin(9600);  
}
 
void loop()
{
 
    // Keep reading from the HC-05 and send to Arduino Serial Monitor
    if (BTserial.available())
    {  
        c = BTserial.read();
        Serial.write(c);
    }
 
    // Keep reading from Arduino Serial Monitor input field and send to HC-05
    if (Serial.available())
    {
        c =  Serial.read();
        BTserial.write(c);  
    }
    if (BTserial.available())
    letra = BTserial.read();
  if (letra == 'A')
  {
    digitalWrite(LED, HIGH);
  }
  if (letra == 'B')
  {
    digitalWrite(LED, LOW);
  }
 
}