电路很简单我就不画了，是stc系列的单片机做的，显示部分就是2个74hc573芯片连到P1口，然后用p3.0控制段选，按键的定义程序里有说明。很容易就能搭出来，下图是效果图，自己用万用板焊的，技术不行。到处都是飞线呵呵，请大家多多指教


 

#include
#define uchar unsigned char
#define uint unsigned int
uchar d0,ss,gs,sf,gf,sm,gm;
uchar e1,e2,e3,e4,e5,e6;
uchar s1,q1;
uchar shi,fen,miao;
// 8 4 2 1 8 4 2 1  
// h g f e d c b a
//效正 累加数98 跑1320秒 实际1316
//当前已走秒数 乘以 当前累加数 除以除以实际秒数 等于 累加数应得值
uchar code num[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x80};//0-9 点
uchar code wes[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0x7f};//1-8位
sbit dua=P3^0;
sbit laba=P3^1;
sbit a1=P3^2;//时间设置
sbit a2=P3^3;//闹钟设置
sbit a3=P3^4;//按键+
sbit a4=P3^5;//按键-
sbit a5=P3^7;//返回 启动闹钟
void weiduan(uchar z,uchar x); //位段 函数
void chushi();    //初始化函数
void shijian();   //时间显示函数
void shjianbata();//测试时间函数
void shezhi();    //时间设置函数
void naozhong();  //闹钟这是函数
void shu();       //时间最大值限制函数
void delay(uchar d1);//延时函数

//...................................................................
void main()
{ chushi(); //初始化时间
  TH0=(65535-40000)/256;//定时器装初值
  TL0=(65535-40000)%256;
  ET0=1;//开定时器0中断
  TR0=1;//启动定时器0
  EA=1; //打开总中断
  laba=1;
while(1)
{  
 shijian(); //调用时间显示函数 显示时间 
 if(a1==1){if(a2==1){if(a3==1){if(a4==1)

{ weiduan(1,10);delay(5);weiduan(3,10);delay(5);weiduan(5,10);delay(5); }}}}
 if(a1==0){delay(100);if(a1==0){shezhi();}}
 if(a2==0){delay(100);if(a2==0){naozhong();}}//调用闹钟设置函数
 if(a5==0){delay(100);{if(a5==0){while(1)

{if(q1==0){q1=1;break;}else{q1=0;break;}}while(a5==0);delay(100);}}}
 if(a2==0){delay(100);if(a2==0){naozhong();}    }
 if(q1==1){weiduan(6,0);delay(20);if(fen==e2)

{if(shi==e1){laba=0;}}if(fen!=e2){laba=1;}  }
 else{laba=1;}
 
  
}
}
//...................................................................
void naozhong()
{while(1)
{   ss=e1/10;
    gs=e1%10;  
    sf=e2/10;
    gf=e2%10;   
    sm=e3/10;
    gm=e3%10;
  delay(10);
 weiduan(0,ss);delay(10);
 weiduan(1,gs);delay(10);
 weiduan(2,sf);delay(10);     
 weiduan(3,gf);delay(10);
 weiduan(4,sm);delay(10);
 weiduan(5,gm);delay(10);

if(a1==0){delay(100);if(a1==0){while(a1==0);delay(20);break;}}
 
if(a2==0){delay(100);while(a2==0);delay(20);s1++;}
if(s1==3){s1=0;}
if(s1==1){weiduan(0,10);delay(5);weiduan(1,10);delay(5);
if(a3==0){delay(20);if(a3==0){e1++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){e1--;}while(a4==0);delay(100);}
}
if(s1==2){weiduan(2,10);delay(5);weiduan(3,10);delay(5);
if(a3==0){delay(20);if(a3==0){e2++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){e2--;}while(a4==0);delay(100);}
}
if(s1==0){weiduan(4,10);delay(5);weiduan(5,10);delay(5);
if(a3==0){delay(20);if(a3==0){e3++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){e3--;}while(a4==0);delay(100);}
}

}


}
//.........................................................
void shezhi()//时间设置函数
{while(1)
{   
    ss=shi/10;
    gs=shi%10;  
    sf=fen/10;
    gf=fen%10;   
    sm=miao/10;
    gm=miao%10;
shijian();

if(a2==0){delay(100);if(a2==0){while(a2==0);delay(20);break;}}
if(a1==0){delay(100);while(a1==0);delay(20);s1++;}
if(s1==3){s1=0;}
if(s1==1){weiduan(0,10);delay(5);weiduan(1,10);delay(5);
if(a3==0){delay(20);if(a3==0){shi++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){shi--;}while(a4==0);delay(100);}
}
if(s1==2){weiduan(2,10);delay(5);weiduan(3,10);delay(5);
if(a3==0){delay(20);if(a3==0){fen++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){fen--;}while(a4==0);delay(100);}
}
if(s1==0){weiduan(4,10);delay(5);weiduan(5,10);delay(5);
if(a3==0){delay(20);if(a3==0){miao++;}while(a3==0);delay(100);}
if(a4==0){delay(20);if(a4==0){miao--;}while(a4==0);delay(100);}
}

}}
//...................................................................
void zhongduan() interrupt 1   //定时器中断函数体
{  TH0=(65535-40400)/256;
   TL0=(65535-40400)%256;


  if(e3>=60)//判断秒等于或超过60
  {e2++;   //分钟加1
  e3=0;}   //秒数清零

  if(e2>=60) //判断分钟等于或超过60
  {e1++;   //小时加1
  e2=0;}   //分钟数清零

  if(e1>=24) //判断小时等于或大于24
  {e1=0;}   //小时数 清零
      d0++;//累加数
   shu(); //调用时间最大值限制函数

 

} 

//...............................................................
void delay(uchar d1)//延时函数
{uchar t0,t1;
for(t0=d1;t0>0;t0--)
for(t1=110;t1>0;t1--);

}

//.................................................................
void weiduan(uchar z,uchar x) //位段选择函数
{  P1=num[x];
   dua=1;
   dua=0;
   P1=wes[z];
  
}

//.....................................................................................
void shijian()//动态扫描时间显示函数 带延时
{
 chushi();//调用时间初始化函数  
 delay(10);
 weiduan(0,ss);delay(10);
 weiduan(1,gs);delay(10);
 weiduan(2,sf);delay(10);     
 weiduan(3,gf);delay(10);
 weiduan(4,sm);delay(10);
 weiduan(5,gm);delay(10);
}

//............................................................
void shu()   //时间最大限制函数体
{  if(d0>=98)  //判断定时器进入 多少次
  {d0=0;    //清除累加数
  miao++;}   //秒数自+

  if(miao>=60)//判断秒等于或超过60
  {fen++;   //分钟加1
  miao=0;}   //秒数清零

  if(fen>=60) //判断分钟等于或超过60
  {shi++;   //小时加1
  fen=0;}   //分钟数清零

  if(shi>=24) //判断小时等于或大于24
  {shi=0;}   //小时数 清零
}
//...................................................................
void chushi() //时间初始化
{   ss=shi/10;
    gs=shi%10;  
    sf=fen/10;
    gf=fen%10;   
    sm=miao/10;
    gm=miao%10;
}
//.............................................................