标题: 单片机数字电压表程序及电路原理图ADC0808+74ls245 [打印本页]

---

作者: 297    时间: 2020-12-22 13:05
标题: 单片机数字电压表程序及电路原理图ADC0808+74ls245

1. #include <reg51.h>
   
2. #define uint unsigned int
   
3. #define uchar unsigned char
   
4. sbit st= P1^0;
   
5. sbit eoc= P1^1;
   
6. sbit oe= P1^2;
   
7. unsigned int a;
   
8. unsigned char code seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
   
9. void delay(unsigned int j)
   
10. {  while(j--);}
    
11.   void   display()
    
12. {   unsigned char i,wk=0x01;  
    
13.      unsigned char buf[3];
    
14.      buf[0]=seg[a%10];
    
15.      buf[1]=seg[a/10%10];
    
16.      buf[2]=seg[a/100];           
    
17. for (i=0;i<3;i++)
    
18. { P3=wk;
    
19. P2=buf[i];
    
20. delay(100);
    
21. wk=wk<<1;
    
22. P2=0xff;
    
23. P3=0x04;
    
24. P2=0x7f;
    
25. delay(100);
    
26.         P2=0xff;}
    
27. }
    
28. void main()
    
29. {P1=0x8f;
    
30. while(1)
    
31.     {st=0;
    
32.      st=1;  
    
33.      delay(1);
    
34.      st=0;
    
35. while(eoc==0);  
    
36.     oe=1;
    
37.    P0=0xff;
    
38.    a=P0;
    
39.    a=(a*100)/51;
    
40.    display();
    
41.    oe=0;
    
42. }
    
43. }

复制代码

---

欢迎光临 (http://www.51hei.com/bbs/)

Powered by Discuz! X3.1