POV display arduino shift register EXAMPLE code

//**************************************************************//
//  Name    : shiftOutCode, Hello World                                
//  Author  : Carlyn Maw,Tom Igoe, David A. Mellis
//  Date    : 25 Oct, 2006    
//  Modified: 26 Sep 2013                                 
//  Version : 2.0                                             
//  Notes   : Code for using a 74HC595 Shift Register           //
//          : to show POV persistence of vision
// http://arduino.cc/en/Tutorial/ShiftOut
// using this sample code http://paulsarduino.co.uk/?page_id=50
//****************************************************************
 
//Pin connected to ST_CP of 74HC595
int latchPin = 8;
//Pin connected to SH_CP of 74HC595
int clockPin = 10;
////Pin connected to DS of 74HC595
int dataPin = 6;
 
int  A[] = { 8,
 0b11000000,
 0b01110000,
 0b00101100,
 0b00100110,
 0b00111000,
 0b11100000,
 0b10000000,
 0b00000000,
};
 
int  R[] = { 7,
 0b11111110,
 0b00010010,
 0b00010010,
 0b00110010,
 0b11011110,
 0b10000000,
 0b00000000,
};
 
int  I[] = { 2,
 0b11111110,
 0b00000000,
};
 
int  E[] = { 6,
 0b11111110,
 0b10010010,
 0b10010010,
 0b10010010,
 0b10010010,
 0b00000000,
};
 
int  L[] = { 5,
 0b11111110,
 0b10000000,
 0b10000000,
 0b10000000,
 0b00000000,
};
 
int  sp[] = { 5,
 0b00000000,
 0b00000000,
 0b00000000,
 0b00000000,
 0b00000000,
};
// output tracking vars
int  iMsgIndex;
int  iCharIndex;
int  iCharLen;
 
int* iMsg[] = {A, R, I, E, L, sp};
int iMsgLen = 3;
 
void setup() {
  //set pins to output so you can control the shift register
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  
  iMsgIndex = 0;
  iCharIndex = 1;
  iCharLen = iMsg[iMsgIndex][0];
}
 
void sendByteOut(int value) {
 digitalWrite(latchPin, LOW);                     // set the strobe LOW
 shiftOut(dataPin, clockPin, LSBFIRST, value);
 digitalWrite(latchPin, HIGH);
 delayMicroseconds(100);
 digitalWrite(latchPin, LOW);
}
 
void loop() {
  
  sendByteOut(iMsg[iMsgIndex][iCharIndex]);
 
  delay(3);
 
  iCharIndex++;
  if (iCharIndex == iCharLen) {
    iCharIndex = 1;
    iMsgIndex++;        // next letter
  }
 
  if (iMsgIndex == iMsgLen) {
    iMsgIndex = 0;
  }
  iCharLen = iMsg[iMsgIndex][0];
 
//  // count from 0 to 255 and display the number 
//  // on the LEDs
//  for (int numberToDisplay = 0; numberToDisplay < 256; numberToDisplay++) {
//    // take the latchPin low so 
//    // the LEDs don't change while you're sending in bits:
//    digitalWrite(latchPin, LOW);
//    // shift out the bits:
//    shiftOut(dataPin, clockPin, MSBFIRST, numberToDisplay);  
//
//    //take the latch pin high so the LEDs will light up:
//    digitalWrite(latchPin, HIGH);
//    // pause before next value:
//    delay(200);
//  }
}