#include <Timer.h>
#define LED7_L 8
#define COM_L 4
const int SEG[LED7_L]={6,7,8,9,10,11,12,13};
const int com[COM_L]={2,3,4,5};
const int DD = 1;
const byte Number[]={B00111111,B00000110,B01011011,B01001111,B01100110,B01101101,B01111101,B00000111,B01111111,B01101111};
int h=2, m=0 , f;
int hm[COM_L];
Timer t1,t2;

void setup() {
  int i;
  pinMode(DD,OUTPUT);
  t1.oscillate(DD, 500, HIGH); //每 0.5 秒閃爍
  t2.every(1000,timeDnc);//每一秒呼叫一次時鐘
  for(i=0;i<LED7_L;i++) pinMode(SEG[i],OUTPUT);
  for(i=0;i<COM_L;i++) pinMode(com[i],OUTPUT);
  f = 0;
}

void loop() {
  int i,j,k;
  hm[3]=h/10;hm[2]=h%10;
  hm[1]=m/10;hm[0]=m%10;
  for(i=0;i<COM_L;i++){
    for(k=0;k<COM_L;k++){
      digitalWrite(com[k],1);
    }
    digitalWrite(com[i],0);
    for(j=0,k=1;j<LED7_L;j++, k<<=1){
       digitalWrite(SEG[j],!(k & Number[hm[i]]));
    }
    delay(1);
  }
  t1.update();
  t2.update();
}

void timeDnc(){
    if(f==0){
      m--;
      if(m<0){
        if(h==0) {
          m = 0;
          f = 1;
        }
        else {
          m=59;
          h--;
       }
    }
  }
}