51单片机外接ADC0808制作简易电压表

main.c

#include

#define uchar unsigned char
#define uint unsigned int
	
sbit   Start = P3^0;
sbit   EOC=P3^1;  //
sbit   OE=P3^2 ;  //

	
uchar code table [] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};//段选

uchar code table_SMG [] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07};//位选
	
//------------------------变量区------------------------
	uint temp;

//------------------------函数区------------------------

void Init_A_D()
{
	Start = 0;
	OE = 0;
	Start = 1;
	Start = 0;    
}

void Delay(uint t)//
{
	while(t--);
}

void Display_SMG(uchar pos , uchar date)//
{
	P2 = table_SMG [pos];//
	P1 = date ;//
	Delay(100);//
}

void Display_Time() //
{
	Display_SMG(0 , table [temp/100%10]|0x80);//
	Display_SMG(2 , table [temp%10]);
	Display_SMG(1 , table [temp/10%10]);
}
void Read_U()
{
	if(EOC==1)   
	{
		OE=1;  //
		temp=P0;   //
		temp=temp*1.0/255*500;    //
		OE=0;    //
		Display_Time();//
		Start=1;      //
		Start=0;
	}
}

void main()
{
	Init_A_D();
	while(1)
	{
		Read_U();
	}
}

仿真图如下：

 注意：所使用的数码管为共阴数码管