#include <LiquidCrystal.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Define LCD pin configuration
LiquidCrystal lcd(8, 9, 7, 6, 5, 4);

// Define buzzer, LED, and DS18B20 sensor pins
const int buzzerPin = 3;   // Connect to Bz1:1
const int ledPin = 13;     // Connect to Digital Pin 13
const int heatSensorPin = 2; // Connect to Data (Pin 2) of DS18B20 sensor

// Setup a oneWire instance to communicate with the DS18B20 sensor
OneWire oneWire(heatSensorPin);
DallasTemperature sensors(&oneWire);

// Threshold temperature for the fire alarm
const float fireThreshold = 50.0; // Adjust as needed

void setup() {
  lcd.begin(16, 2);
  lcd.print("Fire Alarm System");
  delay(2000); // Wait for 2 seconds

  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);

  // Initialize the DS18B20 sensor
  sensors.begin();
}

void loop() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Fire Alarm System");

  // Request temperature data from the DS18B20 sensor
  sensors.requestTemperatures();

  // Get the temperature in Celsius
  float temperatureC = sensors.getTempCByIndex(0);

  lcd.setCursor(0, 1);
  lcd.print("Temperature: ");
  lcd.print(temperatureC);
  lcd.print(" °C");

  // Check if the temperature is above the threshold
  if (temperatureC > fireThreshold) {
    // Turn on the buzzer and LED simultaneously
    tone(buzzerPin, 1000); // Adjust the frequency as needed
    digitalWrite(ledPin, HIGH);

    // Display the alarm message on the LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Fire Detected!");
    lcd.setCursor(0, 1);
    lcd.print("Evacuate!");

    // Wait for a moment
    delay(5000); // Adjust the delay as needed

    // Turn off the buzzer and LED
    noTone(buzzerPin);
    digitalWrite(ledPin, LOW);
  }

  // Wait for 5 seconds before the next loop
  delay(5000);
}