/*void setup() {
DDRD |=(1<<PD7);
cli();
  TCCR2A=0;
  TCCR2B=0;
  TCCR2B |=(1<<CS22) + (1<<CS21) +(1<<CS20);
  TIMSK2 |=(1<<TOIE1);
sei();
Serial.begin(9600);
}

ISR(TIMER2_OVF_vect){
  static unsigned long stevec =0;
  stevec++;
  PORTD ^=(1<<PD7);
  Serial.println(stevec);
}
*/

void setup() {
DDRD |=(1<<PD7);
cli();
  TCCR2A=0;
  TCCR2B=0;
  TCCR2B |=(1<<CS22) + (1<<CS21) +(1<<CS20);
  TIMSK2 |=(1<<TOIE1);
  TCNT2=131;
sei();
Serial.begin(9600);
}

ISR(TIMER2_OVF_vect){
  TCNT2=131;
  static unsigned long stevec =0;
  stevec++;
  if(stevec>=500){
    PORTD ^=(1<<PD7);
    stevec = 0;
  }
}