基于51單片機的adc0809自動切換量程

ID:374056 · 發(fā)表于 2018-7-19 20:32

adc0809測量范圍為5V，如果大于5V，就要分壓；
自動切換量程，就是先采集分壓之后的電壓，如果過小，就通過繼電器換路，進行直接測量

電路原理圖如下：

單片機源碼：

#include<regx51.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define Duan P2
#define Wei P1
sbit START=P0^0;
sbit EOC=P0^1;
sbit max=P0^2;
unsigned char code smg_duan[] ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char code smg_duan1[] ={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};
unsigned char code smg_wei[] ={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
void delay_ms(int t){
int i;
for(t;t>0;t--)
for(i=110;i>0;i--);
}
void display(long num)
{
long num1[8],i;
num1[7] = num/10000000;
num1[6] = (num/1000000)%10;
num1[5] = (num/100000)%10;
num1[4] = (num/10000)%10;
num1[3] = (num/1000)%10;
num1[2] = (num/100)%10;
num1[1] = (num/10)%10;
num1[0] = num%10;
for(i=0;i<8;i++){
Wei = smg_wei[i];
if(i==4)
Duan = smg_duan1[num1[i]];
else
Duan = smg_duan[num1[i]];
delay_ms(1);
}
}
void main(){
uint ad_value;
long dis;
while(1){
max=0;
display(dis);
START = 0;
START = 1;
_nop_();
_nop_();
START = 0; //產(chǎn)生下降沿，啟動AD
while(!EOC);
P3=0xff;
ad_value=P3;
dis=(ad_value)*196.0784*20;
if(dis<=5) //直接測量
{
max=1;
display(dis);
START = 0;
START = 1;
_nop_();
_nop_();
START = 0; //產(chǎn)生下降沿，啟動AD
while(!EOC);
P3=0xff;
ad_value=P3;
dis=(ad_value)*196.0784;
}
//display(dis);
//delay_ms(10);
}
}

復制代碼

ID:247623 · 發(fā)表于 2020-6-26 21:00

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