[嵌入式]51单片机仿真例程-AD转换电压表

代码：

#include<reg51.h>
#define uchar unsigned char
sbit cjclk=P2^4;
sbit EOC=P3^2;
sbit key=P2^5;

uchar tab[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar tabd[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

uchar xsjs;
uchar num0,num1,num2,num3;

uchar cjsh;
uchar xdata *p;

int beichu;
void delay5ms(void)
{
  uchar a,b;
  for(b=19;b>0;b--)
    for(a=130;a>0;a--);
}
void init_t()
{
  TMOD=0x21;
  TH0=0xf8;
  TL0=0X30;
  TH1=0xff;
  TL1=0xff;
  EA=1;
  ET0=1;
  ET1=1;
  TR1=1;
  TR0=1;

}

void int_t1()interrupt 3
{
 bit a;
 a=cjclk;
 cjclk=~a;
}
void int_t0()interrupt 1
{
 TH0=0xf8;
 TL0=0x30;
 switch(xsjs)
 {
   case 0:{P1=0xff;P2=0xfe;P1=tabd[num3];break;}
   case 1:{P1=0xff;P2=0xfd;P1=tab[num2];break;}
   case 2:{P1=0xff;P2=0xfb;P1=tab[num1];break;}
   case 3:{P1=0xff;P2=0xf7;P1=tab[num0];break;}
 }
 xsjs++;
 xsjs%=4;
}
void main()
{
 beichu=0;
 init_t();
 xsjs=0;
 p=0x7fff;
 while(1)
 {
   key=1;
   if(!key)
   {
     delay5ms();
	 if(!key)
	{
   	 *p=0xff;
	 while(EOC);
	 cjsh=*p;
	 beichu=(int)cjsh*5;
	 num3=beichu/ 0xff;
	 beichu=beichu%0xff * 10;
	 num2=beichu / 0xff;
	 beichu=beichu%0xff * 10;
	 num1=beichu /0xff;
	 beichu=beichu%0xff * 10;
	 num0=beichu/0xff;
	}

   
   
   
   }
 
 }
}

效果：

点击按键开始测量电压，然后添加电压探针，通过ADC0808模块开始探测，数字大致一致就可以。

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