ggillcrist:
And I have Vss on the L293d to my varying voltage. i realize that realistically this only varies between about 5 -10v, so as i change that voltage I wan the motor to adjust and maintain and rpm that i tell it to.
Do you mean that the voltage that is being used to power the motor varies from 5v to 10v and you want the motor to maintain a constant RPM?
That is a very strange requirement. Why is the voltage changing?
...R