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

// Define DHT22 pin and type
#define DHTPIN 15
#define DHTTYPE DHT22

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Define LED pin
#define LED_PIN 14

// Define LCD properties
#define LCD_ADDRESS 0x27 // I2C address of the LCD
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

void setup() {
  // Initialize serial communication
  Serial.begin(115200);
  
  // Initialize the DHT sensor
  dht.begin();
  
  // Set LED pin as output
  pinMode(LED_PIN, OUTPUT);
  
  // Initialize LCD
  lcd.init();
  lcd.backlight(); // Enable backlight
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Wait a few seconds between measurements
  delay(2000);
  
  // Read temperature as Celsius
  float temperature = dht.readTemperature();
  // Read humidity
  float humidity = dht.readHumidity();
  
  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  // Print temperature and humidity values to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" *C ");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  
  // Display temperature and humidity on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");
  
  // Check if temperature is greater than 30 degrees Celsius
  if (temperature > 30.0) {
    // Turn on LED
    digitalWrite(LED_PIN, HIGH);
  } else {
    // Turn off LED
    digitalWrite(LED_PIN, LOW);
  }
}