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

const int trig = 2;
const int echo = 3;

LiquidCrystal_I2C lcd(0x27, 2, 16);

long waktu;
int jarak;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 1);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  waktu = pulseIn(echo, HIGH, 30000);
  jarak = waktu * 0.034 / 2;

  lcd.setCursor(0, 0);
  lcd.print("Jarak = ");
  lcd.print(jarak);
  lcd.println(" cm");
}