#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
char * message = "hello maker!";
byte smiley[8] = {
  B10000,
  B10001,
  B00000,
  B00000,
  B10001,
  B01110,
  B00000,
};


void setup()
{
 lcd.init();  // initialize the lcd 
 lcd.setCursor(3,0);
 lcd.backlight();
lcd.createChar(0, smiley);
lcd.begin(16, 2);  
lcd.write(byte(0));
}

void loop()
{
 for (int printStart = 15; printStart >= 0; printStart--)  //scroll on from right
 {
   showLetters(printStart, 0); 
 }

 for (int letter = 1; letter <= strlen(message); letter++)  //scroll off to left
 {
   showLetters(0, letter);
 }
}

void showLetters(int printStart, int startLetter)
{
 lcd.setCursor(printStart,1);
 for (int currentLetter = startLetter; currentLetter < strlen(message); currentLetter++)
 {
   lcd.print(message[currentLetter]);
 } 
 lcd.print(" ");
 delay(250); 
}