#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <IRremote.h>  // Include the IRremote library

// Define pins
const int irReceiverPin = 9;
const int pirSensorPin = 12;
const int ldrPin = A0;
const int buzzerPin = 10;

// Set up the LCD address and dimensions
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Create an instance of IRremote library
IRrecv irrecv(irReceiverPin);
decode_results results;

void setup() {
  // Initialize pins
  pinMode(pirSensorPin, INPUT);
  pinMode(ldrPin, INPUT);
  pinMode(buzzerPin, OUTPUT);

  // Initialize LCD
  lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print(" ");

  // Initialize IR receiver
  irrecv.enableIRIn();  // Start the IR receiver

  // Initialize Serial Monitor
  Serial.begin(9600);
}

void loop() {
  int pirValue = digitalRead(pirSensorPin);
  int ldrValue = analogRead(ldrPin);
  float ldrVoltage = ldrValue * (5.0 / 1023.0);

  // Check if IR remote command is received
  if (irrecv.decode(&results)) {
    // Print the received command to Serial Monitor
    Serial.println("Fire detected ");
    //Serial.println(results.value, HEX);

    // Example: If specific IR code (replace with your remote's code) is received, take action
    if (results.value == 0xFFFFFFFF) {  // Example IR code, replace with your remote's code
      lcd.setCursor(0, 1);
      lcd.println("Fire detected");
      delay(2000);
      lcd.clear();

    }

    irrecv.resume();  // Receive the next value
  }

  // Detect motion based on PIR sensor
  bool motionDetected = (pirValue == HIGH);
  bool fireDetected = (irReceiverPin == HIGH);

  // Detect smoke based on LDR (Photoresistor)
  bool smokeDetected = (ldrVoltage < 2.0); // Assuming low light levels due to smoke

  // Display messages on LCD and activate buzzer based on sensor readings
  if (motionDetected || smokeDetected) {
    digitalWrite(buzzerPin, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("Attention-smoke  ");
    Serial.println("Smoke Detected!");

    if (motionDetected) {
      Serial.println("Motion Detected!");
    }

    if (smokeDetected) {
      Serial.println("Smoke Detected!");
    }
    if (fireDetected){
      Serial.println("Fire Detected");
      delay(100);
      digitalWrite(buzzerPin, HIGH);
    }
  } else {
    digitalWrite(buzzerPin, LOW);
    lcd.setCursor(0, 0);
    lcd.print("All Safe         ");
    Serial.println("All Safe");
  }

  delay(1500);
}