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

// Define the pin and sensor type
#define DHTPIN 4     // DHT sensor data pin is connected to GPIO 4
#define DHTTYPE DHT22 // Using the DHT22 temperature and humidity sensor

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

// Initialize the LCD I2C (Address 0x27, 16 columns, 2 rows)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // Start serial communication for debugging
  Serial.begin(115200);

  // Initialize the LCD screen
  lcd.init();
  lcd.backlight(); // Turn on the screen light

  // Start the DHT sensor
  dht.begin();

  // Display welcome message on LCD
  lcd.setCursor(0,0);
  lcd.print("DHT22 Sensor");
  lcd.setCursor(0,1);
  lcd.print("Initializing...");
  delay(2500); // Wait for 2.5 seconds
  lcd.clear(); // Clear the screen
}

void loop() {
  // Read humidity and temperature values from the sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature(); // Temperature in Celsius

  // Check if the sensor data is valid
  if(isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT22 sensor!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Reading Error");
    lcd.setCursor(0, 1);
    lcd.print("Check Sensor!");
  }
}
[5/2 20.31] .: delay(2500);
    return; // Exit the loop and try again
  }

  // Print values to the Serial Monitor
  Serial.print("Temp: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Display the data on the LCD screen
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature, 1); // Display 1 decimal place
  lcd.print((char)223);      // Character code for the degree symbol (°)
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Humid: ");
  lcd.print(humidity, 1);    // Display 1 decimal place
  lcd.print("%");

  delay(2500); // Wait 2.5 seconds before the next update
}