ISR(TIMER1_COMPA_vect)
{ 
  digitalWrite(4,HIGH);
OCR1A+=100000;
digitalWrite(4,LOW);


}

void setup() {
    pinMode(4, OUTPUT);
  // put your setup code here, to run once:
  TCCR1B=0;
    TCCR1A=0;
    TCCR1B|=B00000100;
    OCR1A=62500;
    TIMSK1|=B00000010;

    // digitalWrite(4,HIGH);
    //OCR1A+=62500;
    TCCR1B=0;
    TCCR1A=0;
    TCCR1B|=B00000100;
    OCR1A=62500;
    TIMSK1|=B00000010;
  
    



}

void loop() {
  // put your main code here, to run repeatedly:

}
// ISR(TIMER1_COMPA_vect)
// {
//   digitalWrite(8, HIGH);
// OCR1A+=62500;
//  digitalWrite(8, LOW);
// }
 

// void setup() {
//   // put your setup code here, to run once:
// pinMode(8, OUTPUT);
// //pinMode(9,OUTPUT);
// TCCR1A=0;
// TCCR1B=0;
// TCCR1B|=B00000100;
// OCR1A=62500;
// OCR1B=6250;
// TIMSK1|=B00000110;
// }
// void loop() {
// //   put your main code here, to run repeatedly:

//  }