#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>
int main(void)
{
	uint16_t duty, TOP;	
  DDRB |= (1<<5);      // By default, PORTB.7 is OC0A
  TOP = 30000;  
  ICR1 = TOP;    
	                                                                                           // Prescalar = 1
	while (1) {
		for(duty=0; duty<TOP; duty++) {
				TCCR1A |= (1 << COM1A1) | (1 << COM1A0) | (1 << WGM11);
				TCCR1B |= (1<<WGM13) |  (1<<WGM12) | (1 << CS10) | (1 << CS12);
				OCR1A = duty;  /*increase the LED light intensity*/
      _delay_ms(5);
		}
   
		for(duty=TOP; duty>0; duty--) {
				TCCR1A |= (1 << COM1A1) | (1 << COM1A0) | (1 << WGM11);
				TCCR1B |= (1<<WGM13) |  (1<<WGM12) | (1 << CS10) | (1 << CS12);
				OCR1A = duty;  /*decrease the LED light intensity*/
      	_delay_ms(5);
		}
    
	}
	return 0;
}