#include<reg51.h>
#define uchar unsigned char
#define	uint  unsigned int
sbit ir_set=P3^4;

void delayus(uint z)
{
	while(z--);
}

main()
{	
	uint i;
	while(1)
	{
		ir_set=0;
		ir_set=1;
		delayus(500);
		ir_set=0;
		delayus(500);
		for(i=0;i<4;i++)
		{
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(60);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(60);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(60);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(60);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(180);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(180);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(180);
			ir_set=1;
			delayus(60);
			ir_set=0;
			delayus(180);
		}
	}
}