int datapin = 2;
int clockpin = 3;
int latchpin = 4;
 
byte data = 0;
 
void setup()
{
  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);  
  pinMode(latchpin, OUTPUT);
}
 
void loop()
{
  //oneAfterAnother();      // All on, all off
  // oneOnAtATime();       // Scroll down the line
  // pingPong();           // Like above, but back and forth
  // randomLED();          // Blink random LEDs
  // marquee();
  binaryCount();        // Bit patterns from 0 to 255
}
 
void shiftWrite(int desiredPin, boolean desiredState){
 
  bitWrite(data,desiredPin,desiredState); //Change desired bit to 0 or 1 in "data"
  shiftOut(datapin, clockpin, MSBFIRST, data); //Send "data" to the shift register
  digitalWrite(latchpin, HIGH);
  digitalWrite(latchpin, LOW);
}
 
void binaryCount()
{
  int delayTime = 1000; // time (milliseconds) to pause between LEDs
  shiftOut(datapin, clockpin, MSBFIRST, data);
  digitalWrite(latchpin, HIGH);
  digitalWrite(latchpin, LOW);
  data++;
  delay(delayTime);
}