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

#define PIR_PIN 2
#define DHT_PIN 3
#define LED_INTRUDER 4
#define LED_FIRE 5
#define BUZZER 6
#define DHT_TYPE DHT22

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHT_PIN, DHT_TYPE);

const float FIRE_TEMP = 40.0;

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_INTRUDER, OUTPUT);
  pinMode(LED_FIRE, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  lcd.init();
  lcd.backlight();
  dht.begin();
}

void loop() {
  bool motionDetected = digitalRead(PIR_PIN);
  float temp = dht.readTemperature();

  // Reset outputs
  digitalWrite(LED_INTRUDER, LOW);
  digitalWrite(LED_FIRE, LOW);
  digitalWrite(BUZZER, LOW);

  lcd.setCursor(0, 0);

  if (motionDetected) {
    digitalWrite(LED_INTRUDER, HIGH);
    digitalWrite(BUZZER, HIGH);
    lcd.print("INTRUDER ALERT! ");
    lcd.setCursor(0, 1);
    lcd.print("Check Security  ");
  } 
  else if (temp >= FIRE_TEMP) {
    digitalWrite(LED_FIRE, HIGH);
    digitalWrite(BUZZER, HIGH);
    lcd.print("FIRE WARNING!   ");
    lcd.setCursor(0, 1);
    lcd.print("Temp: ");
    lcd.print(temp);
    lcd.print("C          ");
  } 
  else {
    lcd.print("SYSTEM SAFE     ");
    lcd.setCursor(0, 1);
    lcd.print("Temp: ");
    lcd.print(temp);
    lcd.print("C          ");
  }

  delay(500);
}