#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define echoPin 2
#define trigPin 3

LiquidCrystal_I2C lcd(0x27 , 16 , 2);

long duration;
int distance;

void setup() {

lcd.init();
lcd.clear();
lcd.backlight();
lcd.setCursor(0,0);

pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {

digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = duration * 0.03423 / 2;

lcd.print("Distance: ");
lcd.setCursor(10,0);
lcd.print(distance);
lcd.println(" cm");
}