// Inspiration for the correct dividers: https://www.engineersgarage.com/knowledge_share/generating-variable-frequency-with-arduino/
// Engineers Garage

#define PWM_OUTPUT1 9
#define PWM_OUTPUT2 3
#define FREQ_DIV 10000

void setup()
{
  pinMode(PWM_OUTPUT1, OUTPUT);//Pwm pin as Output
  TCCR1A=_BV(COM1A1)|_BV(COM1B1);//Non-inverted Mode
  TCCR1B=_BV(WGM13)|_BV(CS11);//Prescalar 8
  ICR1 = FREQ_DIV;
  OCR1A = int (FREQ_DIV/2); // duty cycle
}

void loop(){
  // do nothing. 
  // Delay as long as the delay allows.
  // https://www.arduino.cc/reference/en/language/variables/data-types/unsignedlong/
  delay((2^32 - 1)); 
}