// Print a message to the LCD.

lcd.backlight();

lcd.print("Hello, world!");

}

void loop()

{

}

Sample sketch: Control the back light of the I2C LCD1602 Module

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#if defined(ARDUINO) && ARDUINO >= 100

#define printByte(args)

write(args);

#else

#define printByte(args)

print(args,BYTE);

#endif

LiquidCrystal_I2C lcd(0x20,16,2);

// set the LCD address to 0x20 for a

16 chars and 2 line display

void setup(){

lcd.init();

// initialize the lcd

lcd.backlight();

lcd.home();

lcd.print("Hello world...");

lcd.setCursor(0, 1);

lcd.print("dfrobot.com");