Voice controlled Home automation using Arduino and Bluetooth

#include <DHT.h>
#include <Wire.h>
//including servo library
#include<Servo.h>
int x;
#define DHTPIN 9
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
int pos = 0;
//creating servo object
Servo myservo;
Servo tank;
//automatic home lights
int led_ac = 4;
//automatic garage
Servo servo_garage;
void setup()
{
  pinMode(led_ac , OUTPUT);
  pinMode(11 , OUTPUT);
  pinMode(12 , OUTPUT);
  myservo.attach(2);
  tank.attach(10);
  servo_garage.attach(6);
  dht.begin();
  Wire.begin(8);
  Wire.onReceive(receive);
  myservo.write(0);
  servo_garage.write(30);
  digitalWrite(led_ac, HIGH);
  Serial.begin(9600);
}

void loop()
{
  if (Serial.available())
  {
    int a = Serial.read();
    Serial.println(a);
    //automatci home lights
    if (a == 6)
    {
      digitalWrite(led_ac, HIGH);
    }
    if (a == 7)
    {
      digitalWrite(led_ac, LOW);
    }
    //automatic garage
    if (a == 8)
    {
      servo_garage.write(140);
    }
    if (a == 9)
    {
      servo_garage.write(30);
    }
    //smart home gate
    if (a == 10)
    {
      for (pos = 0; pos <= 90; pos += 1)
      {
        myservo.write(pos);
        delay(15);
      }
      delay(5000);
      for (pos = 90; pos >= 0; pos -= 1)
      {
        myservo.write(pos);
        delay(15);
      }
    }
    //temperature and humidity measurment
    if (a == 11)
    {
      float h = dht.readHumidity();
      Serial.print(h);
      delay(3000);
    }
    if (a == 12)
    {
      float t = dht.readTemperature();
      Serial.print(t);
      Serial.println("°C ");
      delay(3000);
    }
    if (a == 19)
    {
      digitalWrite(11, HIGH);
      digitalWrite(12, LOW);
    }
    if (a == 20)
    {
      digitalWrite(11, LOW);
      digitalWrite(12, LOW);
    }
  }
  else
  {
    if (x == 13)
    {
      for (pos = 0; pos <= 90; pos += 1)
      {
        myservo.write(pos);
        delay(15);
      }
      delay(5000);
      for (pos = 90; pos >= 0; pos -= 1)
      {
        myservo.write(pos);
        delay(15);
      }
    }
    if (x == 2)
    {
      tank.write(180);
    }
    if (x == 16)
    {
      tank.write(90);
    }
  }
}
void receive(int howMany)
{
  x = Wire.read();
  Serial.println(x);
}

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#include<Servo.h>
#include <Wire.h>
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN 5
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);
//Smart Street Lights
int ldr = A3;
int led_street = 2;
//fire detector
int fire = A1;
//Rain detector
int rain = A2;
Servo servo_rain;
//SMART GATE
int sensor_gate = 3;
void setup()
{
  pinMode(fire, INPUT);
  pinMode(ldr, INPUT);
  pinMode(rain, INPUT);
  pinMode(sensor_gate, INPUT);
  servo_rain.attach(8);
  Serial.begin(9600);
  Wire.begin();
  servo_rain.write(90);
  SPI.begin();      // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522
  Serial.println("Put your card to the reader...");
}
void loop()
{
  //smart gate
  int sensor_gate_value = digitalRead(sensor_gate);
  if (sensor_gate_value == LOW)
  {
    Wire.beginTransmission(8);
    Wire.write(3);
    Wire.endTransmission();
    delay(2000);
    Wire.beginTransmission(8);
    Wire.write(16);
    Wire.endTransmission();
  }
  //fire detector
  int fire_value = digitalRead(fire);
  if (fire_value == LOW)
  {
    Wire.beginTransmission(8);
    Wire.write(1);
    Wire.endTransmission();
    delay(4000);
    Wire.beginTransmission(8);
    Wire.write(16);
    Wire.endTransmission();
  }
  //Rain detector
  int rain_value = digitalRead(rain);
  if (rain_value == LOW)
  {
    servo_rain.write(0);
    Wire.beginTransmission(8);
    Wire.write(2);
    Wire.endTransmission();
    delay(4000);
    Wire.beginTransmission(8);
    Wire.write(16);
    Wire.endTransmission();
  }
  else
  {
    servo_rain.write(90);
  }
  //Smart Street Lights
  int ldr_value = analogRead(ldr);
  if (ldr_value <= 48)
    digitalWrite(led_street, HIGH);
  else
    digitalWrite(led_street, LOW);

  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
    return;
  }
  //Show UID on serial monitor
  Serial.print("UID tag :");
  String content = "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("Message : ");
  content.toUpperCase();
  if (content.substring(1) == "89 A9 BB 98") //change here the UID of the card/cards that you want to give access
  {
    Serial.println("Authorized access");
    Serial.println();
    Wire.beginTransmission(8);
    Wire.write(13);
    Wire.endTransmission();
    delay(5000);
    Wire.beginTransmission(8);
    Wire.write(15);
    Wire.endTransmission();
  }
  else
  {
    Serial.println("Access denied");
    Wire.beginTransmission(8);
    Wire.write(14);
    Wire.endTransmission();
    delay(4000);
  }
}