Arduino PWM output

[sand500]

Originally Posted by slijin

I'm not too familiar with the VEX system, so take what I say with a grain of salt, but here's what I see happening:

The VEX motor module has built-in deadbands at 1) the neutral, which allows a user to feed a noisy joystick signal straight to the motor and 2) the ends, which either acts as a safety, to facilitate interfacing with the VEX system (due to hardware/programming constraints etc), or it was a design decision.

Hooking up this signal to a regular DC motor produces exactly that kind of behavior, not because it's how your signal "should" behave, but because it's how motors are expected to behave in response to such signals.

Why does the higher end of the pwm, have a smaller range, 200-255, while the lower end of the pwm has a bigger range, 40-170. When I was running the motor, I could see the motor hit a higher speed in the 40-170 range than in the 200-255. So why would a motor rotate faster in one direction than in another direction?