int DS_pin = 13;
int STCP_pin = 11;
int SHCP_pin = 12;

void setup()
{
 pinMode(DS_pin,OUTPUT);
 pinMode(STCP_pin,OUTPUT);
 pinMode(SHCP_pin,OUTPUT);
 
 writereg();
}

boolean registers[15];

void writereg()
{
  digitalWrite(STCP_pin, LOW);
  
  for (int i = 14; i>=0; i--)
  {
    digitalWrite(SHCP_pin, LOW);
    digitalWrite(DS_pin, registers[i] );
    digitalWrite(SHCP_pin, HIGH);
  }
  
  digitalWrite(STCP_pin, HIGH);
}

void loop()
{
 for(int i = 0; i<15; i++)
 {
  registers[i] = HIGH;
  delay(500);
  writereg();
 }
  
 for(int i = 14; i>=0; i--)
 {
  registers[i] = LOW;
  delay(0);
  writereg();

 }
}