20x4 LCD display - I2C

/**
 * Displays text sent over the serial port (e.g. from the Serial Monitor) on
 * an attached LCD.
 */
#include  
#include

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()
{
    lcd.begin();
    lcd.backlight();
  
    // Initialize the serial port at a speed of 9600 baud
    Serial.begin(9600);
 lcd.setCursor(0,0); lcd.print("linje 1");
 lcd.setCursor(0,1); lcd.print("linje 2");
 lcd.setCursor(0,2); lcd.print("linje 3");
 lcd.setCursor(0,3); lcd.print("linje 4");
}

void loop()
{
    // If characters arrived over the serial port...
    if (Serial.available()) {
        // Wait a bit for the entire message to arrive
        delay(100);
        // Clear the screen
        lcd.clear();

        // Write all characters received with the serial port to the LCD.
        while (Serial.available() > 0) {
            lcd.write(Serial.read());
        }
    }
}