sainsmart LCD 20x4 http://darylrobotproject.wordpress.com/

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

#define I2C_ADDR    0x27  // Define I2C Address
#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

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,LCD_5x8DOTS);
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE); // init the backlight
}

void loop()
{
  demoDisplay();

  lcd.setBacklight(LOW);        // Backlight off
  lcd.home ();                   // go home
  lcd.print("ABCDEFGHIJKLMNOPQRST");
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("UVWXYZ 0123456789   ");
  lcd.setCursor ( 0, 2 );        // go to the next line
  lcd.print("abcdefghijklmnopqrst");
  lcd.setCursor ( 0, 3 );        // go to the next line
  lcd.print("uvwxyz <>!?@#$%&*() ");
  lcd.setBacklight(HIGH);     // Backlight on
  delay(3000);

  for (int i = 0; i < 20; i++) {
    delay(300);
    lcd.scrollDisplayLeft();
  }
  delay(3000);

  for (int i = 0; i < 20; i++) {
    delay(300);
    lcd.scrollDisplayRight();
  }
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.autoscroll(); // This will 'right justify' text from the cursor
  lcd.print("autoscroll");
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.noAutoscroll(); // This will 'left justify' text from the cursor
  lcd.print("noAutoscroll");
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  // This is for text that flows Right to Left
  lcd.rightToLeft();
  lcd.print("rightToLeft");
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.leftToRight(); // This is for text that flows Left to Right
  lcd.print("leftToRight");
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.print("blink");
  lcd.blink(); // Turns on the blinking cursor
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.print("noBlink");
  lcd.noBlink(); // Turns off the blinking cursor
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.print("cursor");
  lcd.cursor(); // Turns the underline cursor on/off
  delay(3000);

  lcd.clear(); // clear display, set cursor position to zero
  lcd.print("noCursor");
  lcd.noCursor(); // Turns the underline cursor on/off
  delay(3000);

}

void demoDisplay()
{
  lcd.clear(); // clear display, set cursor position to zero
  lcd.setBacklight(HIGH);     // Backlight on
  lcd.setCursor (0,0);
  lcd.print("Good afternoon,");
  lcd.setCursor (0,1);        // go col 0 of line 1
  lcd.print("gentlemen.");
  delay(1000);
  lcd.setCursor (0,2);        // go col 0 of line 2
  lcd.print("I am a HAL 9000 ");
  lcd.setCursor (0,3);        // go col 0 of line 3
  lcd.print("computer.");
  delay(4000);
  wipeLines();

  lcd.setCursor (0,0);
  lcd.print("I became operational");
  lcd.setCursor (0,1);
  lcd.print("at the H.A.L. plant ");
  lcd.setCursor (0,2);
  lcd.print("in Urbana, Illinois ");
  lcd.setCursor (0,3);
  lcd.print("on January 12 1992. ");
  delay(4000);
  wipeLines();

  lcd.setCursor (0,0);
  lcd.print("If you'd like to    ");
  lcd.setCursor (0,1);
  lcd.print("hear it I can sing  ");
  lcd.setCursor (0,2);
  lcd.print("it for you.         ");
  lcd.setCursor (0,3);
  lcd.blink(); // Turns on the blinking cursor
  delay(4000);
  wipeLines();
  lcd.noBlink(); // Turns off the blinking cursor
}

void wipeLines() {
  for (int y = 0; y < 4; y++) {
    for (int x = 0; x < 20; x++) {
      lcd.setCursor (x,y);
      lcd.print(" ");
      delay(5);
    }
  }
}