YwRobot LCM1602 IIC V1 20x4 LCD Display with PCF8574T

lcd_i2c.ino

// See http://forum.arduino.cc/index.php?topic=158312.0
// NewLiquidCrystal library
// https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads

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

#define I2C_ADDR 0x27  // Define I2C Address for the PCF8574T

//---(Following are the PCF8574 pin assignments to LCD connections )----
// This are different than earlier/different I2C LCD displays
#define BACKLIGHT_PIN  3
#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  LED_OFF  1
#define  LED_ON  0

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);  // 20x4 characters
  lcd.setBacklightPin(BACKLIGHT_PIN, POSITIVE);
  lcd.setBacklight(LED_ON);
}

void loop()
{
  // Reset the display  
  lcd.clear();
  delay(1000);
  lcd.home();
   
  // Print our characters on the LCD
  lcd.backlight();  //Backlight ON if under program control
  lcd.setCursor(3, 0); //Start at character 3 on line 0
  lcd.print("Hello, world!");
  delay(1000);
  lcd.setCursor(2, 1);
  lcd.print("From YourDuino");
  delay(1000);
  lcd.setCursor(0, 2);
  lcd.print("20 by 4 Line Display");
  lcd.setCursor(0, 3);
  delay(1000);
  lcd.print("http://YourDuino.com");
  delay(1000);
}