#include <Arduino.h>
#include <LiquidCrystal_I2C.h>

// Inisialisasi LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Definisi pin
#define TRIG_PIN 27
#define ECHO_PIN 26
#define BUZZER_PIN 23
#define LED_PIN 13

void setup() {
  // Inisialisasi pin
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  
  // Inisialisasi serial komunikasi
  Serial.begin(115200);
  lcd.init();  // Inisialisasi LCD
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sistem Siaga");
}

void loop() {
  // Mengirimkan pulsa trigger
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  // Membaca durasi dari echo
  long duration = pulseIn(ECHO_PIN, HIGH);
  
  // Menghitung jarak
  float distance = (duration * 0.034) / 2;
  
  // Tampilkan jarak di serial monitor
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  // Deteksi kebocoran
  if (distance < 20.0) { // Anggap jarak < 20 cm sebagai kebocoran
    digitalWrite(BUZZER_PIN, HIGH); // Nyalakan buzzer
    digitalWrite(LED_PIN, HIGH); // Nyalakan LED
    lcd.setCursor(0, 1);
    lcd.print("Benda Asing Terdeteksi!");
  } else {
    digitalWrite(BUZZER_PIN, LOW); // Matikan buzzer
    digitalWrite(LED_PIN, LOW); // Matikan LED
    lcd.setCursor(0, 1);
    lcd.print("Kondisi Aman");  // Membersihkan baris kedua
  }
  
  delay(500); // Penundaan 500 ms
}