#include <LiquidCrystal_I2C.h>
const int trig=3, echo=2;
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
  // put your setup code here, to run once:
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  lcd.init();
  lcd.backlight();

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  int duration=pulseIn(echo, HIGH);
  int distance_cm=(duration/2)/29.1;
  int distance_inch=(duration/2)/74;

  lcd.setCursor(0,0);
  lcd.print("D cm: ");
  lcd.print(distance_cm);

  lcd.setCursor(0,1);
  lcd.print("D inch: ");
  lcd.print(distance_inch);

  delay(500);
  lcd.clear();

}