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仿真原理图如下(proteus仿真工程文件可到本帖附件中下载)
单片机源程序如下:
- #include <reg51.h>
- sbit led=P1^7;
- sbit key=P3^0;
- #include <reg51.h>
- sbit FMS=P2^7;
- sbit keynum1=P1^0;
- sbit keynum2=P1^1;
- sbit keynum3=P1^2;
- sbit keynum4=P1^3;
- void delays(unsigned int MS)
- {
-
- unsigned int i,j;
- for(i=0;i<MS;i++)
- {
- for(j=0;j<1141;j++);
- }
- }
- void LD (unsigned char a)
- {
-
-
- unsigned char i;
- for(i=0;i<200;i++)
- {
- led=~led;
- delays(a);
- }
- led=1;
- }
- int main(void)
- {
- unsigned char keynum,temp;
-
- P3=0xff;
-
- while(1)
- {
- P1=0xff;
- keynum=P3;
- if(keynum!=0xff)
- {
- delays(10);
- temp=P3;
-
- if(keynum==temp)
- {
- if(key==0)
- {
- LD(1);
- }
- else
- {
- keynum=0xff;
- }
-
- }
- }
- }
- }
复制代码
所有资料51hei提供下载:
key-led.rar
(65.61 KB, 下载次数: 12)
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