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

// Initializing an instance of the DHT library using the digital pin 12 and the type of the DHT22 sensor
DHT dht(12, 22);

// Initializing two instances of the LiquidCrystal_I2C library using the I2C address 0x26 and 0x27, 16 columns and 2 rows
LiquidCrystal_I2C lcd1(0x26, 16, 2);
LiquidCrystal_I2C lcd2(0x27, 16, 2);

void setup() {
  // Starting the serial communication with a baud rate of 9600
  Serial.begin(9600);
  // Initializing the DHT sensor
  dht.begin();
  // Initializing and turning on the backlight of the first LCD display
  lcd1.init();
  lcd1.backlight();
  // Initializing and turning on the backlight of the second LCD display
  lcd2.init();
  lcd2.backlight();
}

void loop() {
  delay(2000);// Delay for 2 seconds
  float temp = dht.readTemperature();// Reading the temperature from the DHT sensor
  float humidity = dht.readHumidity();// Reading the humidity from the DHT sensor
  
  if (isnan(temp) || isnan(humidity))// Checking if the readings are valid
    lcd1.home();
    lcd2.home();
    lcd1.print("Error in DHT sensor.");
    lcd2.print("Error in DHT sensor.");// If the readings are not valid, printing an error message to each LCDs
  else
  {
    // If the readings are valid, printing the temperature on the first LCD display
    lcd1.home();
    lcd1.print("Temperature : ");
    lcd1.setCursor(0, 1);
    lcd1.print(temp);

    // Printing the humidity on the second LCD display
    lcd2.home();
    lcd2.print("Humidity : ");
    lcd2.setCursor(0, 1);
    lcd2.print(humidity);
  }
}