#define F_CPU 8000000
#include <avr/io.h>
#include <util/delay.h>
      
cli();
	  void _delayus(unsigned char k){
	  while(k--) _delay_us(1);
	  }
sei();




 
int main(void) 
{
  DDRB =(1<<PINB2); 
  float i, j;

while(1){

for (i=1;i<150;i++){

	j = 1000000/(i*2);
	PORTB = (1<<PIN2);
	
	_delayus(j);
	
	PORTB = (0<<PIN2);
	_delayus(j);

	}


  }
return 0;
}