基于51单片机ADC0808自动数字电压表仿真数码管显示

硬件设计

该设计是基于51单片机，ADC采用TI公司的ADC0808，自动数字电压测量表，显示器采用4位数码管，测量范围为0.5~10V，精度约为0.02。

仿真图如下：

程序源码：

 #include

unsigned char code dispbitcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

unsigned char dispbuf[4];

unsigned int i;

unsigned int j;

unsigned int getdata;

unsigned int temp;

unsigned int temp1;

unsigned char count;

unsigned char d;

sbit ST=P2^4;

sbit OE=P2^5;

sbit EOC=P2^6;

sbit CLK=P2^7;

sbit ADD_A=P3^4;  //选择AD的输入端

sbit ADD_B=P3^5;

sbit ADD_C=P3^6;

sbit D0=P2^0;  //数码管的位控制端

sbit D1=P2^1;

sbit D2=P2^2;

sbit D3=P2^3;

sbit P17=P1^7;  //确定小数点的位置

sbit s1=P3^2;

sbit s2=P3^3;

#define _v0_5 {s1=1;s2=0;}

#define _v10 {s1=0;s2=1;}

unsigned char m;

void TimeInitial();

void Delay(unsigned int i);

void TimeInitial()

{ TMOD=0x10;

 TH1=(65536-200)/256;

 TL1=(65536-200)%256;

 EA=1;

 ET1=1;

 TR1=1;

 }

void Delay(unsigned int i)

{

  unsigned int j;

  for(;i>0;i--)

  {

  for(j=0;j<125;j++)

  {;}

  }

}

void Display()

{ 

P1=dispbitcode[dispbuf[3]];

 D0=0;

 D1=1;

 D2=1;

 D3=1;

 Delay(10);

 P1=0x00;

 P1=dispbitcode[dispbuf[2]];

 if(m==2)

 {

 P17=1;

 }

 D0=1;

 D1=0;

 D2=1;

 D3=1;

 Delay(10); 

 P1=0x00;

 P1=dispbitcode[dispbuf[1]];

  if(m==10)

 {

P17=1;

  }

 D0=1;

 D1=1;

 D2=0;

 D3=1;

 Delay(10);

 P1=0x00;

 P1=dispbitcode[dispbuf[0]]; 

 D0=1;

 D1=1;

 D2=1;

 D3=0;

 Delay(10);

 P1=0x00;

}

void main()

{

TimeInitial();

ADD_A=0;

ADD_B=0;

ADD_C=0;

_v10;

m=2;

while(1)

{   

ST=0;

OE=0;

ST=1;

ST=0;

while(EOC==0);

OE=1;

getdata=P0;

OE=0;

if ((s1==0) && (s2==1) && (getdata<6))

{

ADD_A=1;

_v0_5;

m=10;

}

else if ((s1==1)&&(s2==0) && (getdata>254))

{

ADD_A=0;

_v10;

m=2;

}

temp=(getdata*1.0/255)*500*m;

dispbuf[0]=temp%10;

dispbuf[1]=temp/10%10;

dispbuf[2]=temp/100%10;

dispbuf[3]=temp/1000;

Display();

}

}

void t1(void) interrupt 3 using 0

 {

  TH1=(65536-200)/256;

  TL1=(65536-200)%256;

  CLK=~CLK;

  }

附：http://www.jh-tec.cn/archives/7311