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

// LCD settings
LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD address and dimensions

// DHT sensor settings
#define DHTPIN 11    // Pin where the DHT is connected
#define DHTTYPE DHT22 // Use DHT22 for real-life weather station, supports negative values
DHT dht(DHTPIN, DHTTYPE);

// Custom degree symbol
byte degree_symbol[8] = {
  0b00111,
  0b00101,
  0b00111,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000
};

void setup() 
{
  lcd.init();                     // Initialize the LCD
  lcd.backlight();
  
  // Print name/message
  lcd.print("Bharath"); // Replace "Your Name" with the desired name/message
  delay(5000);            // Delay for 5 seconds

  // Clear the display
  lcd.clear();            // Clear the LCD for new data

  lcd.print("Temp = ");
  lcd.setCursor(0, 1);
  lcd.print("Humidity = ");
  
  lcd.createChar(1, degree_symbol);  // Create degree symbol
  lcd.setCursor(9, 0);
  lcd.write(1);                      // Display degree symbol
  lcd.print("C");
  lcd.setCursor(13, 1);
  lcd.print("%");

  dht.begin(); // Initialize the DHT sensor
}

void loop() 
{
  delay(1000);  // Delay between readings
  const int numReadings = 5;
  float tempSum = 0;
  float humSum = 0;
  int validReadings = 0;

  for (int i = 0; i < numReadings; i++) {
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();
    if (!isnan(temperature) && !isnan(humidity)) {
      tempSum += temperature;
      humSum += humidity;
      validReadings++;
    }
    delay(100); // Delay between individual readings
  }

  if (validReadings > 0) {
    // Calculate average temperature and humidity
    float avgTemp = tempSum / validReadings;   // Already in Celsius
    float avgHum = humSum / validReadings;

    // Clear previous temperature and display
    lcd.setCursor(7, 0);
    lcd.print("     ");  // Clear space
    lcd.setCursor(7, 0);
    lcd.print(avgTemp, 1);  // Display temperature in Celsius with 1 decimal
    lcd.print(" C");         // Add " C" after the temperature

    // Clear previous humidity and display
    lcd.setCursor(11, 1);
    lcd.print("     ");  // Clear space
    lcd.setCursor(11, 1);
    lcd.print(avgHum, 1);  // Display humidity
    lcd.print("%");         // Add "%" after humidity
  } else {
    // Display error if readings are invalid
    lcd.setCursor(7, 0);
    lcd.print("Err ");
    lcd.setCursor(11, 1);
    lcd.print("Err ");
  }
}