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

// Initialize the LCD with the I2C address found using the scanner
LiquidCrystal_I2C lcd(0x27, 16, 2); // Replace 0x27 with the correct address if different

// Define the DHT pin and type
#define DHTPIN 2
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Start the Serial Monitor
  Serial.begin(9600);

  // Start the LCD with the number of columns and rows
  lcd.begin(16, 2);
  lcd.backlight();
  
  // Start the DHT sensor
  dht.begin();
  lcd.setCursor(0, 0);
  lcd.print(" WELCOME TO IOT");
  lcd.setCursor(0, 1);
  lcd.print("     PROJECT    ");
  delay(2000);
  lcd.setCursor(0, 0);
  lcd.print("                   ");

  // Print initial labels to the LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp:       C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity:   %");
  
  Serial.println("DHT11 Sensor Initialized");
  delay(2000); // Wait 2 seconds for the DHT sensor to stabilize
}

void loop() {
  // Read temperature and humidity
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    lcd.setCursor(0, 0);
    lcd.print("Failed to read ");
    lcd.setCursor(0, 1);
    lcd.print("from DHT sensor");
    
    Serial.println("Failed to read from DHT sensor");
    return;
  }
  
  // Print the temperature to the LCD on the first line
  lcd.setCursor(6, 0);
  lcd.print(temperature);
  lcd.print(" "); // Add a space to overwrite any extra digits

  // Print the humidity to the LCD on the second line
  lcd.setCursor(10, 1);
  lcd.print(humidity);
  lcd.print(" "); // Add a space to overwrite any extra digits
  
  // Print the temperature and humidity to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, ");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Wait a few seconds between measurements
  delay(2000);
}