Arduino Code for SainSmart IIC/I2C/TWI Serial 2004 20x4 LCD Module.

i2c_lcd.c

/*
 * Sample code for SainSmart IIC/I2C/TWI Serial 2004 20x4 LCD Module.
 * License: GPL
 */

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR	0x3F
#define En_pin		2
#define Rw_pin		1
#define Rs_pin		0
#define D4_pin		4
#define D5_pin		5
#define D6_pin		6
#define D7_pin		7
#define BACKLIGHT_PIN   3

LiquidCrystal_I2C lcd(I2C_ADDR, En_pin, Rw_pin, Rs_pin,
                      D4_pin, D5_pin, D6_pin, D7_pin);

void setup() {
	lcd.begin (20, 4);

	// Switch on the backlight
	lcd.setBacklightPin(BACKLIGHT_PIN, POSITIVE);
	lcd.setBacklight(LOW);

	// Position cursor and write some text
	lcd.home();
	lcd.print("Hello World");
}

void loop() {
}