#include <LiquidCrystal_I2C.h>

// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;

// set LCD address, number of columns and rows
// if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  

void setup() {
  // initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();  
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // Turn off the cursor:
  lcd.noCursor();
  delay(500);
  // Turn on the cursor:
  lcd.cursor();
  delay(500);
}