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

#define DHTPIN 2      // Pin connected to the DHT sensor
#define DHTTYPE DHT22 // Type of DHT sensor (DHT22)

// Initialize the LCD with I2C address, width, and height
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Initialize the DHT sensor with the specified pin and type
DHT dht(DHTPIN, DHTTYPE);

// Define pins for LED indicators
int ledY = 3;  // Yellow LED for "Freezing"
int ledO = 4;  // Orange LED for "Very Cold"
int ledDG = 5; // Green LED for "Normal"
int ledP = 6;  // Magenta LED for "Hot"
int ledR = 7;  // Red LED for "Very Hot"

void setup() {
  Wire.begin();  // Start I2C communication for LCD
  dht.begin();   // Start the DHT sensor

  lcd.init();       // Initialize the LCD
  lcd.backlight();  // Turn on the LCD backlight
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Initializing..."); // Display startup message

  // Initialize the LED pins as outputs
  pinMode(ledY, OUTPUT);
  pinMode(ledO, OUTPUT);
  pinMode(ledDG, OUTPUT);
  pinMode(ledP, OUTPUT);
  pinMode(ledR, OUTPUT);
}

void loop() {
  delay(5000); // Delay to prevent rapid sensor readings

  float humidity = dht.readHumidity();         // Read humidity from DHT22
  float temperature = dht.readTemperature();   // Read temperature in Celsius

  // Check if sensor readings are valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read data from DHT sensor!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error");
    return;
  }

  // Display temperature and humidity readings on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature, 1); // Display temperature with one decimal
  lcd.print(" ");
  lcd.write(0xDF);           // Degree symbol
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity, 1);    // Display humidity with one decimal
  lcd.print(" %");

  delay(5000);

  // Control LEDs based on temperature conditions
  if (temperature <= 0) {
    lcd.setCursor(0, 0);
    lcd.print("Temp: Freezing   ");
    digitalWrite(ledY, HIGH); // Yellow LED for Freezing
    digitalWrite(ledO, LOW);
    digitalWrite(ledDG, LOW);
    digitalWrite(ledP, LOW);
    digitalWrite(ledR, LOW);
  } else if (temperature <= 16) {
    lcd.setCursor(0, 0);
    lcd.print("Temp: Very Cold  ");
    digitalWrite(ledY, LOW);
    digitalWrite(ledO, HIGH); // Orange LED for Very Cold
    digitalWrite(ledDG, LOW);
    digitalWrite(ledP, LOW);
    digitalWrite(ledR, LOW);
  } else if (temperature <= 25) {
    lcd.setCursor(0, 0);
    lcd.print("Temp: Normal     ");
    digitalWrite(ledY, LOW);
    digitalWrite(ledO, LOW);
    digitalWrite(ledDG, HIGH); // Green LED for Normal
    digitalWrite(ledP, LOW);
    digitalWrite(ledR, LOW);
  } else if (temperature <= 37) {
    lcd.setCursor(0, 0);
    lcd.print("Temp: Hot        ");
    digitalWrite(ledY, LOW);
    digitalWrite(ledO, LOW);
    digitalWrite(ledDG, LOW);
    digitalWrite(ledP, HIGH); // Magenta LED for Hot
    digitalWrite(ledR, LOW);
  } else {
    lcd.setCursor(0, 0);
    lcd.print("Temp: Very Hot   ");
    digitalWrite(ledY, LOW);
    digitalWrite(ledO, LOW);
    digitalWrite(ledDG, LOW);
    digitalWrite(ledP, LOW);
    digitalWrite(ledR, HIGH); // Red LED for Very Hot
  }

  // Control LEDs based on humidity conditions
  if (humidity <= 20) {
    lcd.setCursor(0, 1);
    lcd.print("Humidity: Dry    ");
  } else if (humidity <= 40) {
    lcd.setCursor(0, 1);
    lcd.print("Humidity: Normal ");
  } else if (humidity <= 60) {
    lcd.setCursor(0, 1);
    lcd.print("Humidity: Comfort");
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Humidity: Humid  ");
  }

  delay(2000); // Delay to allow for stable LCD display updates
}