EEPW论坛

程序如下：

#include<REG52.H>

sbit sc=P1^0; //检测电网电平
sbit kg=P1^7; //开关检测
sbit sd=P0^7; //输出

void delayms(unsigned char i)
{
    unsigned char j;

    while(i--)
    {
        for(j=0;j<116;j++)
        {
        ;
        }
}
}

void GET_Z()
{
    while(sc==0)
        ;
    while(sc==1)
        ;
}
void GET_K()
{ 
     bit k=1;
        while(k==1)
        {
        while(kg==0);

        delayms(20);
        if(kg==1)
        k=0 ;

        }
    k=1;
    while(k==1)
    {
        while(kg==1);

        delayms(20);
        if(kg==0)
        k=0 ;

    }
}

void main()
{
    bit R_P0;
    sd=0;
    R_P0=0;
    P1=0xFF;
        while(1)
        {
            GET_K();
            GET_Z();
            R_P0=~R_P0;
            sd=R_P0;
            delayms(100);

        }
}

原理图请看该链接：