单片机例子43个,配套开发板

1、1. 点亮开发板上的第1个发光管#include <reg51.h> /包含头文件，在“reg51.h”上右键单击，并打开，可以看到它里面的定义 /当然也可以改成 reg52.h STC.H 功能一样的，只是定义的IO口有一点区别，51单片机可以通用。sbit led=P10; /定义一个LED 为P1.0 IO口void main() /C语言主函数 led=0; /单片机IO P1.0脚输出一个低电平，点亮发光管。 高电平为5V 低电平为0。while(1);2. 用逐位赋值的方法点亮第一、第三、第五、第七个发光二极管#include <reg51.h> /包含头文

2、件，在“reg51.h”上右键单击，并打开，可以看到它里面的定义sbit led1=P10; /第一个led是和P10口连接的。sbit led3=P12;sbit led5=P14;sbit led7=P16;void main()led1=0; /参照电路图可知，P10为低电平，可以让led1点亮。led3=0;led5=0;led7=0;while(1);/此处设置一个死循环，让程序停留在这里，防止跑飞。3. 用总线操作的方法点亮第一、第三、第五、第七个发光二极管#include <reg51.h> /包含头文件，在“reg51.h”上右键单击，并打开，可以看到它里面的定义v

3、oid main()P1=0XAA; /对P1口的八位一起操作，高低电平分配为10101010，为0的位对应的二极管被点亮。while(1);4. 让一LED闪烁十次后停止#include <reg51.h>sbit led=P10;void delay(unsigned int i)unsigned int j;unsigned char k;for(j=i;j>0;j-)for(k=125;k>0;k-);void main()unsigned char m;for(m=20;m>0;m-)led=led;/没隔一段时间即对输出取反。delay(3000);

4、/闪烁间隔。while(1); /闪烁十次后，到此不再闪烁。5. 使八位LED逐位移动并不断循环#include <reg51.h>#include <intrins.h> /这个头文件是这个方法的核心，它包含了逐步移位函数功能，即程序中的_crol_(P1,y)sbit led=P10;void delay(unsigned int i)unsigned int j;unsigned char k;for(j=i;j>0;j-)for(k=125;k>0;k-);void main()P1=0xfe;delay(1000);while(1)/unsigne

5、d char m;/P1=0xfe;/delay(1000);/for(m=7;m>0;m-)P1=_crol_(P1,1); /P1逐步左移一位。delay(1000);6. 使八位LED逐位移动并不断循环，该方法采用逐个查表赋值的方法#include <reg51.h>unsigned char table=0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f;void delay(unsigned int i)unsigned int j;unsigned char k;for(j=i;j>0;j-)for(k=125;k>0;k-

6、);void main()while(1)unsigned char m;for(m=0;m<8;m+)P1=tablem;delay(2000);7. 用四个led指示HJ-3G实验板键盘最下面一排的四个按键状态。当按键按下时，对应led亮；松开后，对应led灭#include<reg51.h>sbit s2=P34;sbit s3=P35;sbit s4=P36;sbit s5=P37;sbit led1=P10;sbit led2=P11;sbit led3=P12;sbit led4=P13;void main()while(1)if(s2=0)led1=0;else

7、led1=1;if(s3=0)led2=0;elseled2=1;if(s4=0)led3=0;elseled3=1;if(s5=0)led4=0;elseled4=1;8.流水灯#include<reg52.h>#include<intrins.h>void delay(unsigned char i)unsigned char m,n;for(m=i;m>0;m-)for(n=125;n>0;n-);void main()unsigned char k;while(1)P1=0xfe;for(k=0;k<8;k+)delay(2000);P1=_c

8、rol_(P1,1);9. 流水灯 #include<reg52.h>void delay(unsigned char i)unsigned char m,n;for(m=i;m>0;m-)for(n=125;n>0;n-);void main()while(1)P1=0x7e;delay(2000);P1=0xbd;delay(2000);P1=0xdb;delay(2000);P1=0xe7;delay(2000);P1=0xdb;delay(2000);P1=0xbd;delay(2000);P1=0x7e;delay(2000);10. 流水灯 #include

9、<reg51.h>void delay(unsigned char i)unsigned char m,n;for(m=i;m>0;m-)for(n=125;n>0;n-);void main()unsigned char m=255;while(1)P1=m;delay(2000);m-;11. 当按键按下时，led亮；松开后，灭。 #include<reg51.h>sbit k1=P34;sbit led=P10;void main()while(1) /通过大循环不断扫描按键状态if(k1=0)led=0;elseled=1;12. 本程序以HL-1

10、学习板中的k1键为例，模拟其具有2种功能， 一是点亮一个发光二极管，二是蜂鸣器发声#include<reg52.h>#define uchar unsigned char uchar num;sbit beep=P23;sbit led=P10;sbit k1=P34;void delay(uchar i)uchar j,k;for(j=i;j>0;j-)for(k=125;k>0;k-);void main()while(1)if(k1=0)delay(20); /消抖if(k1=0)while(!k1); /等待按键松开num+;switch(num)case 1:

11、 led=0;beep=1; break;case 2: beep=0;led=1;num=0; break;13. 使用HL-1 实验板键盘最下面一排左侧的S2键，控制一LED的亮灭。按下后松开，led亮；按下后再松开，led灭。#include<reg51.h>sbit s2=P34; /采集按键状态，此时作为输入引脚sbit led=P10; /此时作为输出引脚。void delay(unsigned char p)unsigned char m,n;for(m=p;m>0;m-)for(n=125;n>0;n-);void main()while(1) if(s

12、2=0) delay(10); /消抖if(s2=0)while(!s2);/等待按键松开。led=led;14. 不管两个开关当前的状态如何，只要有一个开关状态发声变化，都会使照明灯在打亮或者熄灭两种状态间切换。#include <reg52.h>sbit light=P10;sbit s1=P34;sbit s2=P35;bit change,s1sta,s2sta;/s1sta,s2sta为开关s1和s2前一时刻的状态，用来和当前的s1与s2状态进行对比， /进而判决两个开关的状态有无发生变化。bit keyscan()if(s1s1sta)|(s2s2sta) /为异或，若

13、两者不同，则结果为1。即若两开关中，任一开关的状态发生变化，则此条件即为真。change=1;return change;void main()s1sta=s1;s2sta=s2;while(1)keyscan(); /扫描按键状态是否变化，即是否有人更改了按键状态。if(change)change=0; /清零light=light; /一旦发现有开关状态发生了变化，则灯的状态就取反。（若以前亮，则熄灭；反之则打亮）s1sta=s1; /同时，将s1和s2的当前状态送给s1sta和s2sta，为以后的比较做准备。s2sta=s2;15. 4*4键盘检测程序,按下键后相应的代码显示在数码管上#

14、include<reg51.h>sbit beep=P23;sbit dula=P26;sbit wela=P27; unsigned char i=100;unsigned char j,k,temp,key;void delay(unsigned char i) for(j=i;j>0;j-) for(k=125;k>0;k-);unsigned char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;display(unsign

15、ed char num) P0=tablenum; dula=1; dula=0; P0=0xc0; wela=1; wela=0;void main() dula=0; wela=0; while(1) P3=0xfe; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xee: key=0; break; case 0xde: key=1; break; case 0xbe: key=2; break; case 0x7e: key=3; bre

16、ak; while(temp!=0xf0) temp=P3; temp=temp&0xf0; beep=0; beep=1; display(key); P1=0xfe; P3=0xfd; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xed: key=4; break; case 0xdd: key=5; break; case 0xbd: key=6; break; case 0x7d: key=7; break; while(tem

17、p!=0xf0) temp=P3; temp=temp&0xf0; beep=0; beep=1; display(key); P3=0xfb; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xeb: key=8; break; case 0xdb: key=9; break; case 0xbb: key=10; break; case 0x7b: key=11; break; while(temp!=0xf0) temp=P3; te

18、mp=temp&0xf0; beep=0; beep=1; display(key); P3=0xf7; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xe7: key=12; break; case 0xd7: key=13; break; case 0xb7: key=14; break; case 0x77: key=15; break; while(temp!=0xf0) temp=P3; temp=temp&0xf0;

19、beep=0; beep=1; display(key); 16. 通过键盘采集所按下的数据，并在按下确定键（S17）后，将按下的键组合为一整数。 按键功能S6-S15 数字键09，S17 确定输入#include<reg51.h>#define uchar unsigned charsbit dula=P26;sbit wela=P27;sbit beep=P23;uchar a=16,b=16,c=16,d=16,e=16,f=16;uchar wei,temp,key,ok;uchar s1,s2,s3,s4,s5,s6;unsigned long shu;unsigned

20、char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00;void delay(uchar i)uchar j,k;for(j=i;j>0;j-)for(k=125;k>0;k-);void keyscan() P3=0xfe; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xee: key

21、=0; wei+; break; case 0xde: key=1; wei+; break; case 0xbe: key=2; wei+; break; case 0x7e: key=3; wei+; break; while(temp!=0xf0) temp=P3; temp=temp&0xf0; beep=0; beep=1; P3=0xfd; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xed: key=4; wei+; br

22、eak; case 0xdd: key=5; wei+; break; case 0xbd: key=6; wei+; break; case 0x7d: key=7; wei+; break; while(temp!=0xf0) temp=P3; temp=temp&0xf0; beep=0; beep=1; P3=0xfb; temp=P3; temp=temp&0xf0; if(temp!=0xf0) delay(10); if(temp!=0xf0) temp=P3; switch(temp) case 0xeb: key=8; wei+; break; case 0x

23、db: key=9; wei+; break; case 0x7b: ok=1; /key=11; /wei+; break; while(temp!=0xf0) temp=P3; temp=temp&0xf0; beep=0; beep=1; void display(uchar a,uchar b,uchar c,uchar d,uchar e,uchar f) dula=0; P0=tablea; dula=1; dula=0; wela=0; P0=0xfe; wela=1; wela=0; delay(5); P0=tableb; dula=1; dula=0; P0=0xf

24、d; wela=1; wela=0; delay(5); P0=tablec; dula=1; dula=0; P0=0xfb; wela=1; wela=0; delay(5); P0=tabled; dula=1; dula=0; P0=0xf7; wela=1; wela=0; delay(5); P0=tablee; dula=1; dula=0; P0=0xef; wela=1; wela=0; delay(5); P0=tablef; dula=1; dula=0; P0=0xdf; wela=1; wela=0; delay(5);void main()while(1)keysc

25、an();if(wei!=0) /实时显示switch(wei)case 1: a=key;s1=a; break;case 2: b=key;s2=b; break;case 3: c=key;s3=c; break;case 4: d=key;s4=d; break;case 5: e=key;s5=e; break;case 6: f=key;s6=f; break;if(ok) /将采集到的单个数据转化为一个整数。ok=0;switch(wei)case 1: shu=s1; break;case 2: shu=s2+s1*10; break;case 3: shu=s3+s2*10+

26、s1*100; break;case 4: shu=s4+s3*10+s2*100+s1*1000; break;case 5: shu=s5+s4*10+s3*100+s2*1000+s1*10000; break;case 6: shu=s6+s5*10+s4*100+s3*1000+s2*10000+s1*100000; break;wei=0;/f=16;e=16;d=16;c=16;b=16;a=16;s1=0;s2=0;s3=0;s4=0;s5=0;s6=0;display(a,b,c,d,e,f);17. 第一个数码管静态的显示数字3#include <reg51.h>

27、;sbit dula=P26;/段选信号的锁存器控制sbit wela=P27;/位选信号的锁存器控制void main()dula=0;wela=0;P0=0x4f; /数字“3”的代码dula=1;dula=0;P0=0xfe; /选中第一个数码管wela=1;wela=0;while(1);18六个数码管流动地显示数字3#include <reg51.h>sbit dula=P26;/段选信号的锁存器控制sbit wela=P27;/位选信号的锁存器控制unsigned char code table=0xfe,0xfd,0xfb,0xf7,0xef,0xdf;/数码管各位的

28、码表void delay(unsigned int count)unsigned int i,j;for(i=0;i<count;i+)for(j=0;j<120;j+);void main()unsigned char num;while(1)for(num=0;num<6;num+)P0=tablenum; wela=1;wela=0;P0=0x4f; /数字“3”的代码dula=1;dula=0;delay(2);19. 学习板的第一个数码管动态地显示数字0到F#include <reg51.h>sbit dula=P26;/段选信号的锁存器控制sbit w

29、ela=P27;/位选信号的锁存器控制unsigned char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;/0-F的码表void delay(unsigned int i)unsigned int m,n;for(m=i;m>0;m-)for(n=90;n>0;n-);void main()unsigned char num;while(1)for(num=0;num<16;num+)P0=tablenum; dula=1;dula=

30、0;P0=0xfe; /选中第一个数码管wela=1;wela=0;delay(1000);20. 六位数码管显示任意一个百万以下的整数。程序中的变量num就是被显示的整数（原程序中num=87530）#include<reg52.h>#define uchar unsigned char unsigned long num;uchar j,k;uchar a0,b0,c0,d0,e0,f0;sbit dula=P26;sbit wela=P27;unsigned char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x

31、7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00;void delay(uchar i)for(j=i;j>0;j-)for(k=125;k>0;k-);void display(uchar a,uchar b,uchar c,uchar d,uchar e,uchar f) dula=0; P0=tablea; dula=1; dula=0; wela=0; P0=0xfe; wela=1; wela=0; delay(5); P0=tableb; dula=1; dula=0; P0=0xfd; wela=1; wela=0; delay(5

32、); P0=tablec; dula=1; dula=0; P0=0xfb; wela=1; wela=0; delay(5); P0=tabled; dula=1; dula=0; P0=0xf7; wela=1; wela=0; delay(5); P0=tablee; dula=1; dula=0; P0=0xef; wela=1; wela=0; delay(5); P0=tablef; dula=1; dula=0; P0=0xdf; wela=1; wela=0; delay(5);void main()num=87530;/这个是被显示的整数，只要不超过六位，均可显示出来。/同学

33、们可以随意更改这个num变量的值试验下。while(1)if(num<10)a0=num;b0=16;c0=16;d0=16;e0=16;f0=16;elseif(num<100)a0=num/10;b0=num%10;c0=16;d0=16;e0=16;f0=16;elseif(num<1000)a0=num/100;b0=num%100/10;c0=num%10;d0=16;e0=16;f0=16;elseif(num<10000)a0=num/1000;b0=num%1000/100;c0=num%100/10;d0=num%10;e0=16;f0=16;else

34、if(num<100000)a0=num/10000;b0=num%10000/1000;c0=num%1000/100;d0=num%100/10;e0=num%10;f0=16;elseif(num<1000000)a0=num/100000;b0=num%100000/10000;c0=num%10000/1000;d0=num%1000/100;e0=num%100/10;f0=num%10;display(a0,b0,c0,d0,e0,f0);21. 记录HJ-3G 实验板上S2键按下的次数，并用数码管显示出来#include<reg52.h>#define

35、uchar unsigned char unsigned long num;uchar j,k;uchar a0,b0,c0,d0,e0,f0;sbit dula=P26;sbit wela=P27;sbit s2=P34;unsigned char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00;void delay(uchar i)for(j=i;j>0;j-)for(k=125;k>0;k-);void display(uchar

36、a,uchar b,uchar c,uchar d,uchar e,uchar f) dula=0; P0=tablea; dula=1; dula=0; wela=0; P0=0xfe; wela=1; wela=0; delay(5); P0=tableb; dula=1; dula=0; P0=0xfd; wela=1; wela=0; delay(5); P0=tablec; dula=1; dula=0; P0=0xfb; wela=1; wela=0; delay(5); P0=tabled; dula=1; dula=0; P0=0xf7; wela=1; wela=0; del

37、ay(5); P0=tablee; dula=1; dula=0; P0=0xef; wela=1; wela=0; delay(5); P0=tablef; dula=1; dula=0; P0=0xdf; wela=1; wela=0; delay(5);void keyscan()if(s2=0)while(s2=0);num+;void main()while(1)keyscan();if(num<10)a0=num;b0=16;c0=16;d0=16;e0=16;f0=16;elseif(num<100)a0=num/10;b0=num%10;c0=16;d0=16;e0

38、=16;f0=16;elseif(num<1000)a0=num/100;b0=num%100/10;c0=num%10;d0=16;e0=16;f0=16;elseif(num<10000)a0=num/1000;b0=num%1000/100;c0=num%100/10;d0=num%10;e0=16;f0=16;elseif(num<100000)a0=num/10000;b0=num%10000/1000;c0=num%1000/100;d0=num%100/10;e0=num%10;f0=16;elseif(num<1000000)a0=num/100000;

39、b0=num%100000/10000;c0=num%10000/1000;d0=num%1000/100;e0=num%100/10;f0=num%10;display(a0,b0,c0,d0,e0,f0);22. 让HJ-3G 实验板的第一位闪烁地显示数字3#include <reg51.h>sbit dula=P26;/段选信号的锁存器控制sbit wela=P27;/位选信号的锁存器控制void delay(unsigned int i)unsigned int m,n;for(m=i;m>0;m-)for(n=90;n>0;n-);void main()whi

40、le(1)P0=0xfe; wela=1;wela=0;P0=0x4f; /数字“3”的代码dula=1;dula=0;delay(1000);P0=0x00; /什么都不显示的代码dula=1;dula=0;delay(1000);23. 让HJ-3G 实验板的六位数码管轮流显示数字0到5#include <reg51.h>sbit dula=P26;/段选信号的锁存器控制sbit wela=P27;/位选信号的锁存器控制unsigned char code wei=0xfe,0xfd,0xfb,0xf7,0xef,0xdf;/数码管各位的码表unsigned char code duan=0x3f,0x06,0x5b,0x4f,0x66,0x6d;/0-5的码表void delay(unsigned int i)unsigned int m,n;for(m=i;m>0;m-)for(n=90;n>0;n-);void main()unsigned char num;while(1)for(num=0;num<6;num+)P0=weinum; wela=1;wela=0;P0=duannum; dula=1;dula=0;delay(1000); 24. 让HJ-3G 实验板的六位数码管轮流显示数字0到5 #includ