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Originally Posted by Zee
Yes, it is. I'd also like to know how many encoder counts/time period for a given PWM value.
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You can only do this if the motor is unloaded (and even then it's shakey, at best). In general you can't directly correlate a PWM value to a rotational rate. As noted elsewhere, you are better off commanding a velocity and letting a control loop set the PWM value. There are likely to be motor control examples in the white paper and programming areas.
-Kevin