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#define CLOCK 3
#define DATA 2
#define LATCH 4

void setup()
{
  pinMode( CLOCK, OUTPUT );
  pinMode( DATA, OUTPUT );
  pinMode( LATCH, OUTPUT );
}

void display( int n )
{
  shiftOut( DATA, CLOCK, LSBFIRST, n );
  shiftOut( DATA, CLOCK, LSBFIRST, n >> 8 );
  digitalWrite( LATCH, HIGH );
  digitalWrite( LATCH, LOW );
}

void loop()
{
  unsigned int i;

  for( i = 0x8000; i; i >>= 1 )
  {
    display(i);
    delay(100);
  }

  for( i = 0x0001; i & 0xffff; i <<= 1 )
  {
    display(i);
    delay(100);
  }

  for( i = 0; i < 3; i++ )
  {
    display( 0b1010101010101010 );
    delay(1000);
    display( 0b0101010101010101 );
    delay(1000);
  }

  for( i = 0; i < 0xffff; i++ )
  {
    display(i);
    delay(1);
  }
}