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

// LCD I2C 20x4 - Alamat I2C biasanya 0x27
LiquidCrystal_I2C lcd(0x27, 20, 4);

// DHT Sensor setup
#define DHTPIN 7
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Pin push button & LED
const int doorPin = 2;       // Push button untuk simulasi reed switch
const int buttonPin = 3;     // Push button untuk kontrol LED
const int ledPin = 4;        // Output LED

bool ledState = false;
bool lastButtonState = HIGH;

void setup() {
  // LCD & sensor init
  lcd.init();
  lcd.backlight();
  dht.begin();

  // Pin mode
  pinMode(doorPin, INPUT_PULLUP);     // Simulasi reed switch
  pinMode(buttonPin, INPUT_PULLUP);   // Kontrol LED
  pinMode(ledPin, OUTPUT);

  // Pesan awal
  lcd.setCursor(0, 0);
  lcd.print("Smart Home Ready!");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Baca sensor suhu & kelembaban
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // Tampilkan suhu
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp, 1);
  lcd.print(" C    ");

  // Tampilkan kelembaban
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(hum, 1);
  lcd.print(" %   ");

  // Baca status pintu (push button sebagai reed switch)
  int doorState = digitalRead(doorPin);
  lcd.setCursor(0, 2);
  if (doorState == LOW) {
    lcd.print("Pintu: TERBUKA     ");
  } else {
    lcd.print("Pintu: TERTUTUP    ");
  }

  // Tombol kontrol LED toggle
  bool currentButtonState = digitalRead(buttonPin);
  if (lastButtonState == HIGH && currentButtonState == LOW) {
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
  }
  lastButtonState = currentButtonState;

  // Status lampu di LCD
  lcd.setCursor(0, 3);
  lcd.print("Lampu: ");
  lcd.print(ledState ? "NYALA " : "MATI  ");

  delay(300); // Delay kecil agar LCD tidak flicker
}