/* Serial to Parallel Shifting-Out with a 74HC595
   Copyright John Yu
   http://osoyoo.com/?p=189
 */
int latch = 8;
int clock = 12;
int data_out = 11;
 
byte leds = 0;
 
void setup()
{
  pinMode(latch, OUTPUT);
  pinMode(data_out, OUTPUT);
  pinMode(clock, OUTPUT);
}
 
void loop()
{
  leds = 1;
  sendDataToUC595(latch,data_out,clock,leds);
  delay(500);
  for (int i = 0; i < 7; i++)
  { 
    leds *=2;
  sendDataToUC595(latch,data_out,clock,leds);
    delay(400);
  }
}
 
void sendDataToUC595(int latch,int data_out,int clock,byte out_value)
{
  digitalWrite(latch, LOW);
  shiftOut(data_out, clock, LSBFIRST, out_value);//sent leds value to UC595
  digitalWrite(latch, HIGH);
}