CDI tester project

Using Arduino Project Guidance
242

What I am stumbling on is the DC output. I just want to turn off the HV pulse generator and keep everything else running. When I remove pin 6 from ground the output on pin 5 gets strange, going in cycles.

// const byte setFallingSwitch = 5;
// char risefall = 'R'; // default rising mode
//pinMode (setFallingSwitch, INPUT_PULLUP);

You have removed the pinMode for pin5 and it will be floating. I'm somewhat unclear about what you are trying to do with the R/F setting, and you have a conflict here as you are setting the start time for both R and F modes.

ISR(TIMER1_COMPA_vect) {
  OCR1A = (timerTopValue); // value to set delay between pulses to trigger cdi
  digitalWrite(chargePin, LOW); // guarantee off charge pin at trigger
  digitalWrite(outputPin, HIGH); // turn on pin  trigger

// if (risefall == 'R') // switch not set; default Rising trigger
  {
    delayPeriodStart = micros(); // start looking for response as pulse rises
    trigger = true;
  }
// start Timer 2 for charge pulses
  if (chargePulse)
  {
    timeSliceCount = 0;
    TCNT2 = 0;
    OCR2A = timerTopValue/96; // set 12 periods
    TCCR2B |=  1 << CS22 | 1 << CS21; //prescaleer 256 16us/tick
  }
}

ISR(TIMER1_COMPB_vect) {
  digitalWrite(outputPin, LOW);

// if (risefall == 'F') // switch set for Falling trigger
  {
    delayPeriodStart = micros(); // start looking for response as pulse falls
    trigger = true;
  }
}

I also want to keep the reporting of degrees advance in the DC mode.

I see in the last bi-polar pulse code we had

degreesAdvance = pickupValue - delayDegrees;

I think you can just add it here, and display it as you do in the bipolar sketch.

delayDegrees = pickup - (360.0 * (copy_delayPeriod) / (timerTopValue * 4.0)); // for decimal place in deg display.
degreesAdvance = pickupValue - delayDegrees;