How to use the 74HC595 Shift Register with Arduino. 

Tiene un pequeño error. Este compila int tDelay = 250; int dataPin = 4; // DS - data serial on 74HC595 int latchPin = 7; // ST_CP - storage register clock pin on 74HC595 int clockPin = 8; // SH_CP - shift register clock pin on 74HC595 - Why not D13 SCK pin? bool DirectionState = 0; void setup(){ pinMode(latchPin, OUTPUT); pinMode(dataPin, OUTPUT); pinMode(clockPin, OUTPUT); } void loop(){ byte leds = 0B00000000; updateShiftRegister(leds); delay(tDelay); for (int i = 0; i < 8; i++){ // set the bit i to 1, starting with bit 0, the least significant bit (rightmost bit) bitSet(leds, i); updateShiftRegister(leds); delay(tDelay); } DirectionState = !DirectionState; }