#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27 , 16,2);
const byte trig = 5;
const byte echo = 4;
int traveltime;
int distance;
int t =0;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  lcd.init();
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  traveltime = pulseIn(echo, HIGH);
  distance = (traveltime * 0.0343)/2;
  if(t == 0){ 
  lcd.clear();
  lcd.print("Distance in cm :");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" CM");
  delay(500);
  }
    }