#include <SoftwareSerial.h>;

SoftwareSerial mySerial(10,11); // Rx,Tx pins towards  HC05 

void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
mySerial.begin(38400);   // serial line to HC05 (set your baudrate if not 38400)

   pinMode(2, OUTPUT);
   digitalWrite(2,LOW);   // self test of LED
   delay(1000);
   digitalWrite(2,HIGH);
   delay(1000);
   digitalWrite(2,LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

char Char_In;

  while (mySerial.available())      // something from APP ?
  { 
      Char_In = mySerial.read();    // get it
      Serial.write(Char_In);        // echo on PC
      Serial.println();             // newline on PC
      if(Char_In == '1')   digitalWrite(2,HIGH);    // set LED on if character received = 1
      if(Char_In == '0') digitalWrite(2,LOW);       // set LED to OFF if character received = 0
      delay(1000);                  // wait a while
    }
}