//**************************************************************//
//  Name    : shiftOutCode, Hello World: The Remake             //
//          : From BYTE to INT and back again                   //
//****************************************************************

// Pin connected to ST_CP of 74HC595
int latchPin = 8;
// Pin connected to SH_CP of 74HC595
int clockPin = 12;
// Pin connected to DS of 74HC595
int dataPin = 11;

void setup() {
  // set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
}

void loop() {
  apply( B11111111, B00000000, 500 );
  apply( B00000000, B11111111, 500 );
}

// to apply a value to the chip
void apply( byte first_pin_val, byte second_pin_val, int wait ) {
  digitalWrite(latchPin, LOW); // first turn off the latch
  shiftOut( dataPin, clockPin, LSBFIRST, int(first_pin_val) );
  shiftOut( dataPin, clockPin, LSBFIRST, int(second_pin_val) );
  digitalWrite(latchPin, HIGH); // turn on the latch, to prevent more writing.

  delay( wait ); // and wait until we start again.
}