#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 9
#define ECHO_PIN 10

LiquidCrystal_I2C lcd(0x27, 16, 2); // Ganti ke 0x3F jika tidak tampil

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  lcd.begin(16, 2);   // Tambahkan parameter
  lcd.init();         // Inisialisasi LCD
  lcd.backlight();    // Nyalakan lampu belakang LCD
  lcd.setCursor(0, 0);
  lcd.print("Sensor Jarak");
  delay(1000);
}

void loop() {
  long duration;
  float distance;

  // Kirim sinyal ultrasonik
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Hitung waktu pantulan
  duration = pulseIn(ECHO_PIN, HIGH);

  // Konversi ke cm
  distance = duration * 0.034 / 2;

  // Tampilkan hasil ke LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Jarak:");
  lcd.print(distance, 1); // 1 angka di belakang koma
  lcd.print(" cm");

  delay(1000); // Tunda 1 detik
}