//                           +-\/-+
//  Ain0       (D  5)  PB5  1|    |8   VCC
//  Ain3       (D  3)  PB3  2|    |7   PB2  (D  2)  INT0  Ain1
//  Ain2       (D  4)  PB4  3|    |6   PB1  (D  1)        pwm1
//                     GND  4|    |5   PB0  (D  0)        pwm0
//      

#include<avr/io.h>
#define F_CPU 8000000UL
#include <avr/interrupt.h>
#include<util/delay.h>

int intr_count=0;

void comp_match()
{
 DDRB |= (1<<PB1); // set PB1 as output
 TCCR0A=0x00;
 TCCR0B=0x00;
 TCCR0B |= (1<<CS00)|(1<<CS02);   //prescaling with 1024
 TCCR0A|=(1<<WGM01);//toggle mode and compare match  mode
 //OCR0A= 161; //compare value
 OCR0A= 10; //compare value
 TCNT0=0;
 sei();   //enabling global interrupt
 TIMSK|=(1<<OCIE0A);
}

ISR (TIMER0_COMPA_vect)
{
  if (intr_count==90) //waiting for 100 count because to get 1 sec compare match should occur 100 times
  {
    PORTB^=(1<<PB1); //toggling the LED
    intr_count=0; //making intr_count=0 to continue the process
  }
  else  intr_count++; //incrementing intr_count 
}

void setup()
{
 comp_match();
 
}

void loop()
{}