#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#include <servo.h>
servo sv;
void setup() {
const int trig=5;
const int eco=4;
const int a=6;
const int b=7;
pinMode(trig, OUTPUT);
pinMode(eco, INPUT);
pinMode(a, OUTPUT);
pinMode(b, OUTPUT);

  

}

void loop() {
  digitalWrite(triger,0);
  delayMicroseconds(2);
  digitalWrite(triger,1);
  delayMicroseconds(10);
  long duration=pulseIn(eco,1);
  long distance=duration*0.034/2;
  if(distance<=100){
    sv.write(90);
    delay(2000);
    digitalWrite(a,1);
    digitalWrite(d,0);
    lcd.print("door is closed");

  }
  else
  {
    sv.write(0);
    delay(2000);
    digitalWrite(a,0);
    digitalWrite(d,1);
    lcd.print("door is open")
  }

  
}