can't seem to multiply by a float?

Projects Programming
17

Your code is throwing away the fractional part of every step.

     if (a2 != oldas)
     {
       b = oldas - a2;  // If the result is below 1 this will truncate it to 0
       stepper.rotate(b);
       oldas = a2;
     }

You should keep the fractional parts:

      b = oldas - a2;
     if (b != 0)  // Any full steps to be done?
     {
       stepper.rotate(b);
       oldas += b;  // Keep track of the fractional part not included in this movement.
     }