#include <Wire.h>
#include <DHTesp.h>
#include <LiquidCrystal_I2C.h>

// DHT22 Setup
DHTesp dht;

// Fire Alarm System
const int smokePin = 16;
const int buzzerPin = 11; // Connect to Buzzer
const int bluePin = 12;   // Connect to Blue LED
const int greenPin = 13;  // Connect to Green LED
const int yellowPin = 14; // Connect to Yellow LED
const int redPin = 15;    // Connect to Red LED

// LCD Control
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address, columns, rows


void setup()
{
  pinMode(smokePin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(redPin, OUTPUT);

  // Initialize LCD
  Wire.begin(8, 9);
  lcd.begin(16, 2);

  // Start DHT sensor
  dht.setup(16, DHTesp::DHT22);

  // Display initial message on LCD
  
  lcd.print("Temp: Humidity: ");
}

void loop()
{
  // Read temperature and humidity from DHT22
  float temperature = dht.getTemperature();
  float humidity = dht.getHumidity();

  // Display temperature and humidity on LCD
  lcd.setCursor(6, 0);
  lcd.print(temperature, 1);
  lcd.print(" C        ");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity, 1);
  lcd.print("%");

  // Fire Alarm System
  int smokeValue = digitalRead(smokePin);

  if (smokeValue == HIGH)
  {
    digitalWrite(buzzerPin, HIGH); // Turn on the buzzer
    digitalWrite(bluePin, LOW);   // Turn on the blue LED
    delay(1000);                    // Buzz for 1 second
    
    if (temperature < 0)
    {
      digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
      digitalWrite(bluePin, HIGH);  // Turn on the blue LED
      delay(1000);                    // Wait for 1 second
      digitalWrite(bluePin, HIGH);   // Turn off the blue LED
      }
    else if (temperature < 40 && temperature >= 0)
    {
      digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
      digitalWrite(greenPin, HIGH);  // Turn on the green LED
      delay(1000);                    // Wait for 1 second
      digitalWrite(greenPin, LOW);   // Turn off the green LED
    }
    else if (temperature >= 40 && temperature < 70)
    {
      digitalWrite(buzzerPin, LOW);   // Turn off the buzzer
      digitalWrite(yellowPin, HIGH);  // Turn on the yellow LED
      delay(500);                      // Buzz for 0.5 seconds
      digitalWrite(yellowPin, LOW);   // Turn off the yellow LED
    }
    else if (temperature >= 70)
    {
      digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
      digitalWrite(redPin, HIGH);    // Turn on the red LED
      delay(250);                     // Buzz for 0.25 seconds
      digitalWrite(redPin, LOW);     // Turn off the red LED
    }
  }
  else
  {
    digitalWrite(buzzerPin, LOW); // Turn off the buzzer
    digitalWrite(bluePin, HIGH);  // Turn on the blue LED
    delay(1000);                   // Wait for 1 second
    digitalWrite(bluePin, LOW);   // Turn off the blue LED
  }

  // Delay for a while before the next loop
  delay(2000);
}