//3個按鍵控制廣告燈程序及聲音
int latchPin = 4;
 int clockPin =7;
  int dataPin=8; //七段顯示器3隻腳位
   unsigned char seg7[] = {0xC0,0xF9, 0x44, 0xB0,0x99,0x92,0x82, 0xF8,0X80,0X90, 0xFF};  //數字碼 
   unsigned char com [] = {0xF1, 0xF2,0xF4,0xF8}; //七段共同腳掃描 
   unsigned char digits[4] {0,0,0,0}; //數字暫存
    int s,t,number=0; //整數變數

void setup()
{
  pinMode(latchPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);  
  pinMode(dataPin, OUTPUT); //讓3隻腳都為輸出狀態
}

void loop()
{
  if(digitalRead(A1)==0)  { number=(number+1)%1235; }       
  if(digitalRead(A2)==0)  { number--;if(number<0) number=1234;}    
  if(digitalRead(A3)==0) {for(s=0;s<3;s++){ nodisplay();delay(400);for(t=0;t<100;t++) display();}}    
 for(t=0;t<40;t++)   display();
}
 
 void display()    //閃爍燈
{
  for(char i=0; i<4; i++){
    digitalWrite(latchPin,  LOW);   //將ST_CP上加低電位，讓晶片準備接收數據
    shiftOut(dataPin,clockPin,MSBFIRST,seg7[digits[i]]);//發送顯示碼
    shiftOut(dataPin,clockPin,MSBFIRST,com[i] );//發送數據給com[i]
    digitalWrite(latchPin, HIGH);//將ST_CP恢復高電位
    delay(1);
  }
  digits[3]= number % 10;
  digits[2]= number % 100/10;
  digits[1]= number % 1000/100;
  digits[0]= number / 1000;
}
  void nodisplay()
 {
  for(char i=0; i<4; i++)//掃描四個七段顯示器
  {
   digitalWrite(latchPin, LOW);   //將ST_CP上加低電位，讓晶片準備接收數據
    shiftOut(dataPin,clockPin,MSBFIRST,seg7[10]);//發送顯示碼
    shiftOut(dataPin,clockPin,MSBFIRST,com[i] );//發送數據給com[i]
    digitalWrite(latchPin, HIGH);//將ST_CP恢復高電位
    delay(1);
  }
 }