#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

void setup()
 {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  lcd.print("Hello world");
  delay(2000);
}

void loop() {
  // put your main code here, to run repeatedly:

}