//flow light and beep
#include <reg51.h>
#include <intrins.h>
unsigned char a,b,k,j;
sbit beep=P2^3;
void delay10ms()
{
for(a=100;a>0;a--)
for(b=225;b>0;b--);
}
void main()
{
k=0xfe;
while(1)
{
delay10ms();
beep=0;
delay10ms();
beep=1;
j=_crol_(k,1);
k=j;
P1=j;
}
}
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