//Welcome in the project Moch Rijki Supriyatna:("MrS_Iky")
//Smart Home Multi-Sensor System with IR Remote Control & Alarm
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Servo.h>
#include <IRremote.h>

// --- Konfigurasi Pin ---
#define DHTPIN 7
#define DHTTYPE DHT22
#define MQ2_PIN A0
#define TRIG_PIN 8
#define ECHO_PIN 9
#define BUZZER_PIN 10
#define LED_PIN 11
#define SERVO_PIN 6
#define IR_PIN 2

// --- Inisialisasi Komponen ---
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myServo;
IRrecv irrecv(IR_PIN);
decode_results results;

// --- Variabel Sistem ---
unsigned long lastLogTime = 0;
bool alarmActive = false;
int distance = 0;

void setup() {
  Serial.begin(9600);
    dht.begin();
      lcd.begin(16, 2);
        lcd.backlight();
          myServo.attach(SERVO_PIN);
            pinMode(MQ2_PIN, INPUT);
              pinMode(TRIG_PIN, OUTPUT);
                pinMode(ECHO_PIN, INPUT);
                  pinMode(BUZZER_PIN, OUTPUT);
                    pinMode(LED_PIN, OUTPUT);

                      irrecv.enableIRIn();

                        lcd.setCursor(0, 0);
                          lcd.print("Smart System");
                            lcd.setCursor(0, 1);
                              lcd.print("Initializing...");
                                delay(2000);
                                  lcd.clear();
                                  }

                                  void loop() {
                                    // --- IR Remote ---
                                      if (irrecv.decode(&results)) {
                                          long key = results.value;
                                              if (key == 0xFFA25D) { // tombol Power
                                                    alarmActive = !alarmActive;
                                                          lcd.setCursor(0, 0);
                                                                lcd.print("Alarm: ");
                                                                      lcd.print(alarmActive ? "ON " : "OFF");
                                                                          } else if (key == 0xFF629D) { // Vol+
                                                                                lcd.setCursor(0, 1);
                                                                                      lcd.print("Open Door   ");
                                                                                            myServo.write(90);
                                                                                                } else if (key == 0xFFE21D) { // Vol-
                                                                                                      lcd.setCursor(0, 1);
                                                                                                            lcd.print("Close Door  ");
                                                                                                                  myServo.write(0);
                                                                                                                      }
                                                                                                                          irrecv.resume();
                                                                                                                            }

                                                                                                                              // --- Sensor Ultrasonik ---
                                                                                                                                digitalWrite(TRIG_PIN, LOW);
                                                                                                                                  delayMicroseconds(2);
                                                                                                                                    digitalWrite(TRIG_PIN, HIGH);
                                                                                                                                      delayMicroseconds(10);
                                                                                                                                        digitalWrite(TRIG_PIN, LOW);
                                                                                                                                          long duration = pulseIn(ECHO_PIN, HIGH);
                                                                                                                                            distance = duration * 0.034 / 2;

                                                                                                                                              // --- Sensor DHT22 ---
                                                                                                                                                float h = dht.readHumidity();
                                                                                                                                                  float t = dht.readTemperature();

                                                                                                                                                    // --- Sensor Gas MQ2 ---
                                                                                                                                                      int gasValue = analogRead(MQ2_PIN);

                                                                                                                                                        // --- Cek Alarm ---
                                                                                                                                                          if (alarmActive && (distance < 20 || gasValue > 300)) {
                                                                                                                                                              digitalWrite(BUZZER_PIN, HIGH);
                                                                                                                                                                  digitalWrite(LED_PIN, HIGH);
                                                                                                                                                                      lcd.setCursor(0, 1);
                                                                                                                                                                          lcd.print("!!! ALERT !!! ");
                                                                                                                                                                            } else {
                                                                                                                                                                                digitalWrite(BUZZER_PIN, LOW);
                                                                                                                                                                                    digitalWrite(LED_PIN, LOW);
                                                                                                                                                                                      }

                                                                                                                                                                                        // --- LCD Output ---
                                                                                                                                                                                          lcd.setCursor(0, 0);
                                                                                                                                                                                            lcd.print("T:");
                                                                                                                                                                                              lcd.print(t, 1);
                                                                                                                                                                                                lcd.print("C ");
                                                                                                                                                                                                  lcd.print("H:");
                                                                                                                                                                                                    lcd.print(h, 0);
                                                                                                                                                                                                      lcd.print("%");

                                                                                                                                                                                                        // --- Logging ke Serial tiap 10 detik ---
                                                                                                                                                                                                          if (millis() - lastLogTime >= 10000) {
                                                                                                                                                                                                              Serial.print("Log >> Temp: ");
                                                                                                                                                                                                                  Serial.print(t);
                                                                                                                                                                                                                      Serial.print("C | Hum: ");
                                                                                                                                                                                                                          Serial.print(h);
                                                                                                                                                                                                                              Serial.print("% | Gas: ");
                                                                                                                                                                                                                                  Serial.print(gasValue);
                                                                                                                                                                                                                                      Serial.print(" | Jarak: ");
                                                                                                                                                                                                                                          Serial.print(distance);
                                                                                                                                                                                                                                              Serial.println(" cm");

                                                                                                                                                                                                                                                  lastLogTime = millis();
                                                                                                                                                                                                                                                    }

                                                                                                                                                                                                                                                      delay(500);
                                                                                                                                                                                                                                                      }