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

#define trig 3   
#define echo 5   

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);

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

lcd.setCursor(0, 0);
lcd.print("Digital Ruler");
}

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

long duration = pulseIn(echo, HIGH);
int distance = duration * 0.034 / 2;

lcd.setCursor(0, 1);
lcd.print("jarak:20 ");
lcd.print(distance);
lcd.print(" 30 cm ");

delay(300);
 }