74HC595
and from Breadboard to PCB

//**************************************************************//

//  Name    : shiftOutCode, Predefined Dual Array Style         //

//  Author  : Carlyn Maw, Tom Igoe                              //

//  Date    : 25 Oct, 2006                                      //

//  Version : 1.0                                               //

//  Notes   : Code for using a 74HC595 Shift Register           //

//          : to count from 0 to 255                            //

//****************************************************************



//Pin connected to ST_CP of 74HC595

int latchPin = 7;

//Pin connected to SH_CP of 74HC595

int clockPin = 6;

////Pin connected to DS of 74HC595

int dataPin = 5;



//holders for infromation you're going to pass to shifting function

byte segmentArray[10];

unsigned long levelArray[17];



void setup() {

  //set pins to output because they are addressed in the main loop

  pinMode(latchPin, OUTPUT);

  Serial.begin(9600);



  //                  PGFEDCBA

  segmentArray[0] = 0b11000000; //0

  segmentArray[1] = 0b11111001; //1

  segmentArray[2] = 0b10100100; //2

  segmentArray[3] = 0b10110000; //3

  segmentArray[4] = 0b10011001; //4

  segmentArray[5] = 0b10010010; //5

  segmentArray[6] = 0b10000010; //6

  segmentArray[7] = 0b11111000; //7

  segmentArray[8] = 0b10000000; //8

  segmentArray[9] = 0b10010000; //9



  levelArray[0]=  0b0000000000000000;

  levelArray[1]=  0b1000000000000000;

  levelArray[2]=  0b1100000000000000;

  levelArray[3]=  0b1110000000000000;

  levelArray[4]=  0b1111000000000000;

  levelArray[5]=  0b1111100000000000;

  levelArray[6]=  0b1111110000000000;

  levelArray[7]=  0b1111111000000000;

  levelArray[8]=  0b1111111100000000;

  levelArray[9]=  0b1111111110000000;

  levelArray[10]= 0b1111111111000000;

  levelArray[11]= 0b1111111111100000;

  levelArray[12]= 0b1111111111110000;

  levelArray[13]= 0b1111111111111000;

  levelArray[14]= 0b1111111111111100;

  levelArray[15]= 0b1111111111111110;

  levelArray[16]= 0b1111111111111111;



  //function that blinks all the LEDs

  //gets passed the number of blinks and the pause time

  blinkAll_2Bytes(2,500); 

}



void loop() {

  for (int i = 0; i < 17; i++) {

    unsigned long j = levelArray[i];

    //load the light sequence you want from array

    //ground latchPin and hold low for as long as you are transmitting

    digitalWrite(latchPin, 0);

    //move 'em out

    shiftOut(dataPin, clockPin, lowByte(j));

    shiftOut(dataPin, clockPin, highByte(j));

    //return the latch pin high to signal chip that it 

    //no longer needs to listen for information

    digitalWrite(latchPin, 1);

    delay(100);

  }

  delay(2000);



  /*

  for (unsigned long j = 0; j < 65536; j++) {

    //load the light sequence you want from array

    //ground latchPin and hold low for as long as you are transmitting

    digitalWrite(latchPin, 0);

    //move 'em out

    shiftOut(dataPin, clockPin, lowByte(j));

    shiftOut(dataPin, clockPin, highByte(j));

    //return the latch pin high to signal chip that it 

    //no longer needs to listen for information

    digitalWrite(latchPin, 1);

    delay(5);

  }

  */

}







// the heart of the program

void shiftOut(int myDataPin, int myClockPin, byte myDataOut) {

  // This shifts 8 bits out MSB first, 

  //on the rising edge of the clock,

  //clock idles low



  //internal function setup

  int i=0;

  int pinState;

  pinMode(myClockPin, OUTPUT);

  pinMode(myDataPin, OUTPUT);



  //clear everything out just in case to

  //prepare shift register for bit shifting

  digitalWrite(myDataPin, 0);

  digitalWrite(myClockPin, 0);



  //for each bit in the byte myDataOutￜ

  //NOTICE THAT WE ARE COUNTING DOWN in our for loop

  //This means that %00000001 or "1" will go through such

  //that it will be pin Q0 that lights. 

  for (i=7; i>=0; i--)  {

    digitalWrite(myClockPin, 0);



    //if the value passed to myDataOut and a bitmask result 

    // true then... so if we are at i=6 and our value is

    // %11010100 it would the code compares it to %01000000 

    // and proceeds to set pinState to 1.

    pinState= bitRead(myDataOut,i);



    //Sets the pin to HIGH or LOW depending on pinState

    digitalWrite(myDataPin, pinState);

    //register shifts bits on upstroke of clock pin  

    digitalWrite(myClockPin, 1);

    //zero the data pin after shift to prevent bleed through

    digitalWrite(myDataPin, 0);

  }



  //stop shifting

  digitalWrite(myClockPin, 0);

}





//blinks the whole register based on the number of times you want to 

//blink "n" and the pause between them "d"

//starts with a moment of darkness to make sure the first blink

//has its full visual effect.

void blinkAll_2Bytes(int n, int d) {

  digitalWrite(latchPin, 0);

  shiftOut(dataPin, clockPin, 0);

  shiftOut(dataPin, clockPin, 0);

  digitalWrite(latchPin, 1);

  delay(200);

  for (int x = 0; x < n; x++) {

    digitalWrite(latchPin, 0);

    shiftOut(dataPin, clockPin, 255);

    shiftOut(dataPin, clockPin, 255);

    digitalWrite(latchPin, 1);

    delay(d);

    digitalWrite(latchPin, 0);

    shiftOut(dataPin, clockPin, 0);

    shiftOut(dataPin, clockPin, 0);

    digitalWrite(latchPin, 1);

    delay(d);

  }

}