#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#include<Servo.h>
Servo servo;
int const trigPin = 6;
int const  echoPin = 5;
void setup()
{
lcd.begin(16, 2);
lcd.setCursor(0,0);
lcd.backlight();
pinMode(trigPin, OUTPUT); 
pinMode(echoPin,  INPUT); 
    servo.attach(3);
}
void loop()
{       int duration, distance;
digitalWrite(trigPin,  HIGH); 
delay(1);
digitalWrite(trigPin, LOW);
// Measure the pulse input  in echo pin
duration = pulseIn(echoPin, HIGH);
// Distance is half the duration  devided by 29.1 (from datasheet)
distance = (duration/2) / 29.1;
// if distance  less than 0.5 meter and more than 0 (0 or less means over range) 
if (distance  <= 50 && distance >= 0) {
	servo.write(0);
    lcd.print("TERBUKA");
    delay(1000);
    lcd.clear();
} else {
	
	servo.write(90);
    lcd.print("TERTUTUP");
    delay(1000);
    lcd.clear();
}

}