#include<BluetoothSerial.h>
#define ledPIN 2
BluetoothSerial SerialBT;
byte BTdata; 

void setup()
{
    pinMode(ledPIN,OUTPUT);
    Serial.begin(115200);
    SerialBT.begin("baby");
    Serial.println("Bluetooth is start ready to pair...")
}
void loop()
{
    if(SerialBT.available());
    {
        BTdata=SerialBT.Read();
        Serial.Write(BTdata);
    }
    if(BTdata=='1')
    {
        digitalWrite(ledPIN,HIGH);
    }
    else
    {
        digitalWrite(ledPIN,LOW);
    }
}