#include <DHT.h>
#include <IRremote.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

// === PIN SETUP ===
#define DHTPIN 7
#define DHTTYPE DHT22
#define PIR_PIN 8
#define MQ2_PIN A0
#define IR_RECEIVE_PIN 2
#define BUZZER_PIN 3
#define LED_PIN 4
#define SERVO_PIN 5

// === OBJEK ===
DHT dht(DHTPIN, DHTTYPE);
IRrecv irrecv(IR_RECEIVE_PIN);
decode_results results;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo kunci;

bool alarmAktif = false;

void setup() {
  Serial.begin(9600);
    dht.begin();
      irrecv.enableIRIn();
        
          pinMode(PIR_PIN, INPUT);
            pinMode(MQ2_PIN, INPUT);
              pinMode(BUZZER_PIN, OUTPUT);
                pinMode(LED_PIN, OUTPUT);
                  
                    lcd.init();
                      lcd.backlight();
                        
                          kunci.attach(SERVO_PIN);
                            kunci.write(0); // Posisi kunci tertutup
                              
                                lcd.setCursor(0, 0);
                                  lcd.print("Smart Home Ready");
                                    delay(2000);
                                      lcd.clear();
                                      }

                                      void loop() {
                                        float suhu = dht.readTemperature();
                                          float kelembaban = dht.readHumidity();
                                            int gasValue = analogRead(MQ2_PIN);
                                              bool gerakan = digitalRead(PIR_PIN);

                                                lcd.setCursor(0, 0);
                                                  lcd.print("T:");
                                                    lcd.print(suhu);
                                                      lcd.print("C ");
                                                        lcd.print("H:");
                                                          lcd.print(kelembaban);
                                                            lcd.print("%");

                                                              lcd.setCursor(0, 1);
                                                                if (alarmAktif) {
                                                                    lcd.print("Alarm: ON ");
                                                                      } else {
                                                                          lcd.print("Alarm: OFF");
                                                                            }

                                                                              // === DETEKSI BAHAYA ===
                                                                                if (alarmAktif) {
                                                                                    if (gasValue > 500) {
                                                                                          tone(BUZZER_PIN, 1000);
                                                                                                digitalWrite(LED_PIN, HIGH);
                                                                                                      lcd.setCursor(0, 1);
                                                                                                            lcd.print("Gas Detected!!!");
                                                                                                                } else if (gerakan) {
                                                                                                                      tone(BUZZER_PIN, 2000);
                                                                                                                            digitalWrite(LED_PIN, HIGH);
                                                                                                                                  lcd.setCursor(0, 1);
                                                                                                                                        lcd.print("Motion Detected ");
                                                                                                                                            } else {
                                                                                                                                                  noTone(BUZZER_PIN);
                                                                                                                                                        digitalWrite(LED_PIN, LOW);
                                                                                                                                                            }
                                                                                                                                                              } else {
                                                                                                                                                                  noTone(BUZZER_PIN);
                                                                                                                                                                      digitalWrite(LED_PIN, LOW);
                                                                                                                                                                        }

                                                                                                                                                                          // === PEMBACAAN REMOTE ===
                                                                                                                                                                            if (irrecv.decode(&results)) {
                                                                                                                                                                                switch (results.value) {
                                                                                                                                                                                      case 0xFF30CF: // Tombol "1"
                                                                                                                                                                                              alarmAktif = true;
                                                                                                                                                                                                      lcd.setCursor(0, 1);
                                                                                                                                                                                                              lcd.print("Alarm: ON       ");
                                                                                                                                                                                                                      break;
                                                                                                                                                                                                                            case 0xFF18E7: // Tombol "2"
                                                                                                                                                                                                                                    alarmAktif = false;
                                                                                                                                                                                                                                            lcd.setCursor(0, 1);
                                                                                                                                                                                                                                                    lcd.print("Alarm: OFF      ");
                                                                                                                                                                                                                                                            break;
                                                                                                                                                                                                                                                                  case 0xFF7A85: // Tombol "3"
                                                                                                                                                                                                                                                                          kunci.write(90); // Buka pintu
                                                                                                                                                                                                                                                                                  lcd.setCursor(0, 1);
                                                                                                                                                                                                                                                                                          lcd.print("Pintu Terbuka   ");
                                                                                                                                                                                                                                                                                                  delay(5000);
                                                                                                                                                                                                                                                                                                          kunci.write(0); // Tutup lagi
                                                                                                                                                                                                                                                                                                                  lcd.setCursor(0, 1);
                                                                                                                                                                                                                                                                                                                          lcd.print("Pintu Terkunci  ");
                                                                                                                                                                                                                                                                                                                                  break;
                                                                                                                                                                                                                                                                                                                                      }
                                                                                                                                                                                                                                                                                                                                          irrecv.resume(); // Siap terima sinyal lagi
                                                                                                                                                                                                                                                                                                                                            }

                                                                                                                                                                                                                                                                                                                                              delay(500);
                                                                                                                                                                                                                                                                                                                                              }