void setup() {
  sei();
  TCCR1A = (1 << COM1A1) | (1 << WGM11);
  TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS11) | (1 << CS10);

  ICR1 = 4999; //50Hz frequency (16MHz / (64 * 50) - 1)
  TCNT1 = 0;

  OCR1A = 1500;

  DDRB |= (1 << PB1);

  TIMSK1 |= (1 << TOIE1);
  Serial.begin(9600);
}

void loop() {

}

// Timer1 overflow ISR
ISR(TIMER1_OVF_vect) {

}