原理圖及其源代碼壓縮包的下載地址：http://www.51hei.com/bbs/dpj-19526-1.html

下面是主要的程序文件預(yù)覽：
#include
unsigned int i=0;
sbit P36=P3^6;
unsigned char j;
unsigned int kop;
unsigned char a[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char b[8]={0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
void delaym(unsigned int t)
{ unsigned char p;
while(t--)
{
for(p=0; p<125; p++);
}
}

void main()
{
EA = 1;
TH0=0x00;
TL0=0x00;
ET0=1;
ET1=1;
TMOD = 0x15;// 打開定時(shí)器和計(jì)數(shù)器T0，因此矩形脈沖輸入端接P3.4
TH1=0x3C; //50ms
TL1=0xB0;
TR0 = 1;
TR1 = 1;
while(1)
{
for(j=0;j<3;j++) //顯示個(gè)數(shù)
{
P0=b[j];
P2=j;
delaym(2);
}
}
}
timer3() interrupt 3 //定時(shí)器中斷時(shí)間到,就讀取計(jì)數(shù)器值
{ TH1=0X3C;
TL1=0XB0;
i++;
if(i==20) //1s才進(jìn)行技術(shù)脈沖值顯示，即每秒更新一次速度
{
kop=TH0;//計(jì)數(shù)器計(jì)入脈沖，每來一個(gè)矩形脈沖計(jì)數(shù)值加1
kop=kop<<8;
kop=kop+TL0;

b[2]=a[kop/100]; //顯示計(jì)數(shù)器的值即實(shí)際測(cè)得速度
b[1]=a[kop%100/10];
b[0]=a[kop%100%10];
i=0;
TH0=0;//計(jì)數(shù)器速度獲取后清零，進(jìn)行下次獲取
TL0=0;
}
}