//**************************************************************// // 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 = 8; //Pin connected to SH_CP of 74HC595 int clockPin = 12; ////Pin connected to DS of 74HC595 int dataPin = 11; 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(500); } }