int latchPin = 8;  // Latch pin (STCP)
int clockPin = 12; // Clock pin (SHCP)
int dataPin = 11;  // Data pin (DS)
const int sevSegPins[] = {23,25,27,29,31,33,35};
  /*VCC => 5V
  OE => GND
  MR => 5V
  GND => GND*/
byte leds = 0;    // 亮燈的LED數量
byte numbers [10][7]{
  {1,1,1,1,1,1,0}, //0
  {0,1,1,0,0,0,0}, //1
  {1,1,0,1,1,0,1}, //2
  {1,1,1,1,0,0,1}, //3
  {0,1,1,0,0,1,0}, //4
  {1,0,1,1,0,1,1}, //5
  {1,0,1,1,1,1,1}, //6
  {1,1,1,0,0,1,0}, //7
  {1,1,1,1,1,1,1}, //8
  {1,1,1,0,0,1,1}  //9
};
void setup() 
{
  // Set all the pins of 74HC595 as OUTPUT
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);
  pinMode(sevSegPins[7], OUTPUT);
  for (int i=0;i<7,i++){
    pinMode(sevSegPins[i], OUTPUT);
  }
}

void displayNumber(int num){
  for(int i=0;i<7;i++){
  digitalWrite(sevSegPins[i],numbers[num][i]);
  delay(100);
  }
}

void loop() 
{
  leds = 0; // 一開始燈全滅，所以設為0
  updateShiftRegister();  //送資料
  delay(100);
  for (int i = 0; i < 4; i++) //依序亮燈
  {
    bitSet(leds, i);    // 經由多少燈要亮的i，換算成10進位，並把結果交給leds
    updateShiftRegister(); //進行送資料的副程式
    delay(25);
  }
  displayNumber();
}

void updateShiftRegister()
{
   digitalWrite(latchPin, LOW);
   shiftOut(dataPin, clockPin, LSBFIRST, leds);
   digitalWrite(latchPin, HIGH);
}
74HC595