Stepper Motor Step Accuracy Issues

Other Hardware Motors, Mechanics, Power and CNC
42

Your code seems to be very confused.

In this function

void stepMotor(boolean dir, int nSteps, int dirPin, int stepPin)  // Input - Value for Direction Pin, Number of 
Steps to be moved pins, uC Pins for direction and step
{
  digitalWrite(dirPin, dir);    // HIGH - Towards the Motor || LOW - Away from the Motor
  delayMicroseconds(2);
  for (int i = 0; i < nSteps; i++)
  {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(pulsePeriod);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(pulsePeriod);
  }
}

you have a pulse width of 800 microsecs (when 10 is probably sufficient) AND you have also an interval after the pulse of 800 µsecs.

Then in this code

for (int i = 0; i < nMoveSteps; i++)
  {
    stepMotor(HIGH, 1, dPin, sPin);
    delay(delayTime); // For Delay between each step
  }

you add an extra interval of 2 millisecs.

I suggest you change your function to

void stepMotor(boolean dir, int nSteps, int dirPin, int stepPin)  
{
  digitalWrite(dirPin, dir);    // HIGH - Towards the Motor || LOW - Away from the Motor
  delayMicroseconds(2);
  for (int i = 0; i < nSteps; i++)
  {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(stepPin, LOW);
    delay(intervalBetweenSteps);
  }
}

and then remove the speed control from loop().

And start with a value of 20 millisecs for the intervalBetweenSteps as that will give a modest 50 steps per second - or even try a longer interval.

...R