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



#define BACKLIGHT_PIN     13

LiquidCrystal_I2C lcd(0x27,16,2);  // Set the LCD I2C address

//LiquidCrystal_I2C lcd(0x27,16,2, BACKLIGHT_PIN, POSITIVE);  // Set the LCD I2C address

char * message = "hello maker!";
// Creat a set of new characters
const uint8_t charBitmap[][8] = {
   { 0xc, 0x12, 0x12, 0xc, 0, 0, 0, 0 },
   { 0x6, 0x9, 0x9, 0x6, 0, 0, 0, 0 },
   { 0x0, 0x6, 0x9, 0x9, 0x6, 0, 0, 0x0 },
   { 0x0, 0xc, 0x12, 0x12, 0xc, 0, 0, 0x0 },
   { 0x0, 0x0, 0xc, 0x12, 0x12, 0xc, 0, 0x0 },
   { 0x0, 0x0, 0x6, 0x9, 0x9, 0x6, 0, 0x0 },
   { 0x0, 0x0, 0x0, 0x6, 0x9, 0x9, 0x6, 0x0 },
   { 0x0, 0x0, 0x0, 0xc, 0x12, 0x12, 0xc, 0x0 }
   
};

void setup()
{
  lcd.init();  // initialize the lcd 
 lcd.setCursor(3,0);
 lcd.backlight();
   int charBitmapSize = (sizeof(charBitmap ) / sizeof (charBitmap[0]));

  // Switch on the backlight
  pinMode ( BACKLIGHT_PIN, OUTPUT );
  digitalWrite ( BACKLIGHT_PIN, HIGH );
  

   for ( int i = 0; i < charBitmapSize; i++ )
   {
      lcd.createChar ( i, (uint8_t *)charBitmap[i] );
   }

  lcd.home ();                   // go home
  lcd.print("testing graphics ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print (" groovy ");
  delay ( 2000 );
}

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); 
   lcd.home ();
   // Do a little animation by writing to the same location
   for ( int i = 0; i < 2; i++ )
   {
      for ( int j = 0; j < 16; j++ )
      {
         lcd.print (char(random(7)));
      }
      lcd.setCursor ( 0, 1 );
   }
   delay (200);
}