Internet Connected Smart House

#include <Servo.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); //

Servo myservo;  // create servo object to control a servo
const int pingTrig = A0;
const int pingEcho = A1;
int LED_Red = 5;
int LED_Green = 7;

void setup() {
  myservo.attach(8); // attaches the servo on pin 9 to the servo object
  pinMode(pingTrig, OUTPUT);
  pinMode(pingEcho,  INPUT);
  Serial.begin(9600);
  pinMode(LED_Red, OUTPUT);
  pinMode(LED_Green, OUTPUT);
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
}
  
void loop() {
  long duration, inches, cm;

  // The HC-SR04 is triggered by a HIGH
  //pulse of 2 or more microseconds.
  // Give a short LOW pulse beforehand to
  // ensure a clean HIGH pulse
  digitalWrite(pingTrig,  LOW);
  delayMicroseconds( 5);
  digitalWrite(pingTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pingTrig,  LOW);
 duration = pulseIn(pingEcho, HIGH);

  // convert the time into a distance
  inches = microsecondsToInches(duration);

  Serial.print(inches);
  Serial.print("in, ");
  Serial.println();
 // reads the value of the potentiometer
 // (value between 0 and 1023)
  if (inches < 4)
 // scale it to use it with the servo 
//(value between 0 and 180)
  {
    myservo.write(180);
    digitalWrite (LED_Red, LOW);
    digitalWrite (LED_Green, HIGH);

    lcd.setCursor(0, 0);
    lcd.print(" Welcome 2 :) ");


 lcd.setCursor(0, 1);
    lcd.print("Mellsmart House");
  }

  else
  { myservo.write(0);
    digitalWrite (LED_Red, HIGH);
    digitalWrite (LED_Green, LOW );
    lcd.setCursor(0, 0);
    lcd.print("Door closed :(");
    lcd.setCursor(0, 1);
    lcd.print("Mellsmart House");

  }
  delay(15);  // waits for the servo to get there
}
long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}