// Bluetooth Tutorial By Robo India

#include <SoftwareSerial.h>
SoftwareSerial BlueTooth(5, 6); // (TXD, RXD) of HC-06

char BT_input; // to store input character received via BT.

void setup()
{
  pinMode(13, OUTPUT);     // Arduino Board LED Pin
  BlueTooth.begin(9600);
}

void loop()
{
  if (BlueTooth.available())

  {
    BT_input=(BlueTooth.read());
    if (BT_input=='a')
    {
      digitalWrite(13, HIGH);
      BlueTooth.println("Now LED is ON");
    }
    else if (BT_input=='b')
    {
      digitalWrite(13, LOW);
      BlueTooth.println("Now LED is OFF");
    }
   else if (BT_input=='?')
    {
      BlueTooth.println("Send 'a' to turn LED ON");
      BlueTooth.println("Send 'b' to turn LED OFF");
    }
   // You may add other if else condition here.
  }
}