ArduinoCode

#include <SoftwareSerial.h>
#define buzzer 11
#define AIN1 5
#define AIN2 6
#define BIN1 9
#define BIN2 10
SoftwareSerial HC06(4, 3);
int LDR = A0; //Sensor Pin to Analog A0

void setup() {
  HC06.begin(9600); //Baudrate 9600 , Choose your own baudrate
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(LDR, INPUT);

  pinMode(AIN1,OUTPUT);
  pinMode(AIN2,OUTPUT);
  pinMode(BIN1,OUTPUT);
  pinMode(BIN2,OUTPUT);

  digitalWrite(LED_BUILTIN, LOW);
}

void loop() {

  if(HC06.available() > 0) //When HC06 receive something
  {
    char receive = HC06.read(); //Read from Serial Communication
    if(receive == '1') //If received data is 1, turn on the LED and send back the sensor data
    {

      int data = analogRead(LDR);
      HC06.println(data);

      digitalWrite(buzzer, HIGH);
      digitalWrite(LED_BUILTIN, HIGH);
      digitalWrite(AIN1,HIGH);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,HIGH);
      digitalWrite(BIN2,LOW);
      delay(1000);
      digitalWrite(AIN1,LOW);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,LOW);
      digitalWrite(buzzer, LOW);
    }else if(receive == '2'){
      digitalWrite(buzzer, HIGH);
      digitalWrite(LED_BUILTIN, HIGH);
      digitalWrite(AIN1,LOW);
      digitalWrite(AIN2,HIGH);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,HIGH);
      delay(1000);
      digitalWrite(AIN1,LOW);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,LOW);
      digitalWrite(buzzer, LOW);
    }else if(receive == '3'){
      digitalWrite(buzzer, HIGH);
      digitalWrite(LED_BUILTIN, HIGH);
      digitalWrite(AIN1,HIGH);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,HIGH);
      delay(1000);
      digitalWrite(AIN1,LOW);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,LOW);
      digitalWrite(buzzer, LOW);
    }else if(receive == '0'){
      digitalWrite(AIN1,LOW);
      digitalWrite(AIN2,LOW);
      digitalWrite(BIN1,LOW);
      digitalWrite(BIN2,LOW);
      digitalWrite(buzzer, LOW);
      digitalWrite(LED_BUILTIN, LOW);
    }
  }
  delay(10);
}