arduino_code.ino

#include <SPI.h>
//MOSI: pin 11 don't use for anything
//MISO: pin 12 to Q7 of last register
//SCK:  pin 13 to CP
//PL:  pin 2
byte shift[24];
byte i;

void setup()
{
  Serial.begin(9600);
  SPI.setClockDivider(SPI_CLOCK_DIV128);
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  SPI.begin();

  pinMode(2, OUTPUT);
  digitalWrite(2, HIGH);
}


void loop()
{
  digitalWrite(2, LOW);
  delay(1);
  digitalWrite(2,HIGH);

  i = 24;
  while (i--);
  {
    shift[i] = SPI.transfer(0x00);
  }

  delay(1000);
}