//**************************************************************//
//  Name    : shiftOutCode, Hello World
//  Author  : Carlyn Maw,Tom Igoe, David A. Mellis
//  Date    : 25 Oct, 2006
//  Modified: 23 Mar 2010
//  Version : 2.0
//  Notes   : Code for using a 74HC595 Shift Register           //
//          : to count from 0 to 255
//****************************************************************
//Pin connected to ST_CP of 74HC595
int latchPin = 4;
//Pin connected to SH_CP of 74HC595
int clockPin = 3;
////Pin connected to DS of 74HC595
int dataPin = 2;
void setup() {
//set pins to output so you can control the shift register
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
}
void loop() {
// 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);
}
}