#define F_CPU 8000000UL
#include <avr/io.h>
#include <util/delay.h>
int main(void)
{
	uint8_t duty;	
  DDRB |= (1<<7);                                                                                                                 // By default, PORTB.7 is OC0A
	OCR0A = 1;                                                             
	TCCR0A |= (1<<COM0A1) |(1<<COM0A0) |(1<<WGM01)| (1<<WGM00);            // Connect OC0A to PB7, Fast PWM
	TCCR0B |= (1<<CS00);                                                                                                       // Prescalar = 1
	while (1) {
		for(duty=1; duty<255; duty++) {
			OCR0A = duty;  /*increase the LED light intensity*/
			_delay_ms(10);
		}
		for(duty=255; duty>1; duty--) {
			OCR0A =duty;  /*decrease the LED light intensity*/
			_delay_ms(10);
		}
	}
	return 0;
}