#include <Servo.h>
#include <LiquidCrystal_I2C.h>
Servo servo1;

int trigPin = 11;
int echoPin = 12;
long distance;
long duration;
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup()
{
 servo1.attach(9);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  pinMode(3,OUTPUT);
  pinMode(2,OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop() {
  ultra();
  if(distance > 20){
  digitalWrite(2,HIGH);
  servo1.write(0);
  delay(300);
  digitalWrite(2,LOW);
  lcd.setCursor(0,0);                 
  lcd.print(String() + "CLOSE ");
  }
  if(distance < 20){
    digitalWrite(3,HIGH);
  servo1.write(120);
  delay(5000);
  digitalWrite(3,LOW);
  lcd.setCursor(0,0);                 
  lcd.print(String() + "OPEN ");
  }
 
}

void ultra() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration*0.034/2;
  }