#define DATA_PIN 2
#define CLOCK_PIN 3
#define LATCH_PIN 4

byte character[27][8] = 
{
  { B00011000,B00111100,B01100110,B01100110,B01111110,B01100110,B01100110,B00000000 },  //A
  { B11111100,B01100110,B01100110,B01111100,B01100110,B01100110,B11111100,B00000000 },  //B
  { B00111100,B01100110,B01000000,B01000000,B01000000,B01100110,B00111100,B00000000 },  //C
  { B11111000,B01101100,B01100110,B01100110,B01100110,B01101100,B11111000,B00000000 },  //D
  { B11111110,B01100010,B01101000,B01111000,B01101000,B01100010,B11111110,B00000000 },  //E
  { B11111110,B01100010,B01101000,B01111000,B01101000,B01100000,B11110000,B00000000 },  //F
  { B00111100,B01100110,B11000000,B11000000,B11001110,B01100110,B00111110,B00000000 },  //G
  { B11001100,B11001100,B11001100,B11111100,B11001100,B11001100,B11001100,B00000000 },  //H 
  { B01111000,B00110000,B00110000,B00110000,B00110000,B00110000,B01111000,B00000000 },  //I
  { B00011110,B00001100,B00001100,B00001100,B11001100,B11001100,B01111000,B00000000 },  //J
  { B11110110,B01100110,B01101100,B01111000,B01101100,B01100110,B11110110,B00000000 },  //K
  { B11110000,B01100000,B01100000,B01100000,B01100010,B01100110,B11111110,B00000000 },  //L
  { B11000110,B11101110,B11111110,B11111110,B11010110,B11000110,B11000110,B00000000 },  //M
  { B11000110,B11100110,B11110110,B11011110,B11001110,B11000110,B11000110,B00000000 },  //N
  { B00111000,B01101100,B11000110,B11000110,B11000110,B01101100,B00111000,B00000000 },  //O
  { B11111100,B01100110,B01100110,B01111100,B01100000,B01100000,B11110000,B00000000 },  //P
  { B01111000,B11001100,B11001100,B11001100,B11011100,B01111000,B00011100,B00000000 },  //Q
  { B11111100,B01100110,B01100110,B01111100,B01101100,B01100110,B11110110,B00000000 },  //R
  { B01111000,B11001100,B11100000,B01110000,B00011100,B11001100,B01111000,B00000000 },  //S
  { B11111100,B10110100,B00110000,B00110000,B00110000,B00110000,B01111000,B00000000 },  //T
  { B11001100,B11001100,B11001100,B11001100,B11001100,B11001100,B11111100,B00000000 },  //U
  { B11001100,B11001100,B11001100,B11001100,B11001100,B01111000,B00110000,B00000000 },  //V
  { B11000110,B11000110,B11000110,B11010110,B11111110,B11101110,B11000110,B00000000 },  //W
  { B11000110,B11000110,B01101100,B00111000,B00111000,B01101100,B11000110,B00000000 },  //X
  { B11001100,B11001100,B11001100,B01111000,B00110000,B00110000,B01111000,B00000000 },  //Y
  { B11111110,B11000110,B10001100,B00011000,B00110010,B01100110,B11111110,B00000000 },  //Z
  { B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000 }   //(blank)
};

int charN = 0;
unsigned long lastCharUpdate = 0;

void setup()
{
  pinMode(DATA_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(LATCH_PIN, OUTPUT);
}

void loop()
{
  if (millis() - lastCharUpdate >= 500)
  {
    charN = (charN + 1) % 27;
    lastCharUpdate = millis();
  }

  for (int i = 0; i < 8; i++)
  {
    shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, 0x01 << i);
    shiftOut(DATA_PIN, CLOCK_PIN, LSBFIRST, 0xff ^ character[charN][i]);
    digitalWrite(LATCH_PIN, HIGH);
    digitalWrite(LATCH_PIN, LOW);

    delay(5);
  }
}