＃i nclude <absacc.h>
＃i nclude <reg51.h>
＃i nclude  <math.h>
#define uchar unsigned char
#define uint unsigned int
#define ADC0809  XBYTE[0x0B000]  //P2.6選通     
float sum=0,fjg;
uint i,j,*q,*p,sd=5;
sbit p1_0=P1^0; 
void wait(uint n);
void main(void)
{   j=0;
    TMOD=0X01;//設置定時器0
     TH0=0XFC;//定時時間設為1ms 
     TL0=0X18;
      EA=0;//先關中斷
      EA=1;//開總中斷
      ET0=1;  
      //TR0=1;
     for(; ;)
    {
      if(j=20){
 do{}while(!TF0);
   q=0x30;
for(i=0;i<20;i++)   //轉化后的數值求均方根
 {sum=sum+(*q)*(*q);
  q++;
   }
    sum=sum/20;
   fjg=sqrt(sum);
if(fjg>sd)          //判斷是否跳閘
   p1_0=1;
   j=0;
}}
}
void power(void)
{  uchar x;
   for(;;)
        {ADC0809=0x01;
         wait(1000);
         x=ADC0809;
         P2=x;
         }
}

void wait(uint n)
{   uint i,j;
    for(i=0;i<n;i++)
    for(j=0;j<100;j++);
}
timer0()interrupt 1 using 1
{*p=ADC0809;
   p++; 
  TH0=0XFC;
  TL0=0X18;
  TR0=1;
  j++; 
}