/*
  LiquidCrystal Library - Hello World
 
 Demonstrates the use a 20x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the 
 Hitachi HD44780 driver.
 
 This sketch prints "Hello World!" to the LCD
 and shows the time.
 
 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe
 
 This example code is in the public domain.

 */

// Include the library code:
#include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins
//  rs, enable, d0, d1, d2, d3, d4, d5, d6, d7
  LiquidCrystal lcd(12, 13, 4, 5, 6, 7, 8, 9, 10, 11);

uint8_t rows = 2;
uint8_t cols = 20;

unsigned long count;

// Double height numeric character set
byte digitsHi[10][8] = {
    {0x00, 0x0e, 0x11, 0x11, 0x11, 0x13, 0x13, 0x15}, //0
    {0x00, 0x04, 0x0c, 0x1c, 0x04, 0x04, 0x04, 0x04}, //1
    {0x00, 0x0e, 0x11, 0x11, 0x01, 0x01, 0x02, 0x02}, //2
    {0x00, 0x1f, 0x01, 0x02, 0x02, 0x04, 0x08, 0x0e}, //3
    {0x00, 0x10, 0x10, 0x10, 0x14, 0x14, 0x14, 0x1f}, //4
    {0x00, 0x1f, 0x11, 0x10, 0x10, 0x10, 0x10, 0x1e}, //5
    {0x00, 0x06, 0x04, 0x08, 0x08, 0x10, 0x10, 0x1e}, //6
    {0x00, 0x1f, 0x01, 0x01, 0x01, 0x02, 0x02, 0x04}, //7
    {0x00, 0x0e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e}, //8
    {0x00, 0x0e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0f}  //9
};
byte digitsLo[10][8] = {
    {0x15, 0x19, 0x19, 0x11, 0x11, 0x11, 0x0e, 0x00}, //0
    {0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x0e, 0x00}, //1
    {0x04, 0x04, 0x08, 0x08, 0x10, 0x10, 0x1f, 0x00}, //2
    {0x01, 0x01, 0x01, 0x01, 0x11, 0x11, 0x0e, 0x00}, //3
    {0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x00}, //4
    {0x01, 0x01, 0x01, 0x11, 0x11, 0x11, 0x0e, 0x00}, //5
    {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e, 0x00}, //6
    {0x04, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00}, //7
    {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e, 0x00}, //8
    {0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x08, 0x00}  //9
};
  
void setup() {
  // Set up the LCD's number of columns and rows: 
  lcd.begin(cols, rows);
  
  // Print a message to the LCD.
  lcd.print("hello, world!");
  delay(1000);
  
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Time passed");
}

// Display a double height digit in column specified
void doubleHeight(uint8_t n, byte col) {
  if ((col>=0) & (col < cols) & (n>=0) & (n<10)) {
    lcd.createChar(col % 4, digitsHi[n]);
    lcd.createChar(col % 4 +4, digitsLo[n]);
    lcd.setCursor(col,0);
    lcd.write(col % 4);
    lcd.setCursor(col,1);
    lcd.write(col % 4 +4);
  }
}

void loop() {

  count = millis()/1000;
  

  // Print each digit, starting at least significant
  //  and shift count one digit
  doubleHeight(count % 10, 19);  // ones
  count=count/10;
  doubleHeight(count % 10, 18);  // tens
  count=count/10;
  doubleHeight(count % 10, 17);  // hundreds
  count=count/10;
  doubleHeight(count % 10, 16);  // thousands
  count=count/10;

  delay(955);
     
}