Hi Randy,

the problem on your question is,
that the steps are equal to a distance,
but the motor voltage equal to the speed.

So it sounds to convert apples to bananas.

Solution:
You count a value up or down (depending
from the direction signal) with the step signal
and compare these value with another given from
a position sensor.
Then switch on the motor until both are equal.

There is no need to vary the motor voltage.


Peter