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

// Set alamat I2C dan ukuran LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pin Ultrasonik
const int trigPin = 9;
const int echoPin = 10;

long duration;
float distance;

void setup() {
  lcd.init(); 
    lcd.backlight(); // Nyalakan backlight
      pinMode(trigPin, OUTPUT);
        pinMode(echoPin, INPUT);
          lcd.setCursor(0,0);
            lcd.print("Penggaris Digital");
              delay(2000);
                lcd.clear();
                }

                void loop() {
                  // Kirim sinyal ultrasonic
                    digitalWrite(trigPin, LOW);
                      delayMicroseconds(2);
                        digitalWrite(trigPin, HIGH);
                          delayMicroseconds(10);
                            digitalWrite(trigPin, LOW);

                              // Hitung jarak
                                duration = pulseIn(echoPin, HIGH);
                                  distance = duration * 0.034 / 2;

                                    // Tampilkan di LCD
                                      lcd.setCursor(0, 0);
                                        lcd.print("Jarak:");
                                          lcd.setCursor(7, 0);
                                            lcd.print(distance, 1); // 1 angka desimal
                                              lcd.print(" cm   ");

                                                delay(500);
                                                }