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Unread 02-02-2012, 02:09
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VEX Robotics Engineer
AKA: Arthur Dutra IV; NERD #18
FRC #0148 (Robowranglers)
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Re: pic: Gasp!

Quote:
Originally Posted by compwiztobe View Post
This works? I know for a fact that VEX motors have built in speed controllers that operate off the same signal that the digital sidecar (with a jumper for power). I suppose this would still work just fine since you are giving it a 100% duty cycle signal and just varying the supplied voltage, in effect bypassing the built in speed controller. But what's the point?
This is incorrect.

The old 3-Wire VEX motors had an integrated motor controller and were controlled directly by "servo PWM" pulse and could not be controlled via a Victor or Jaguar speed controller.

The new 2-Wire VEX motors (both the smaller 269 and larger 393 motors, the latter of which were included in the 2012 KOP) are just simple DC motor gearboxes. The are controlled on VEX robots by either directly plugging these into the 2-wire motor ports on the VEX Cortex controller, or by using the Motor Controller 29 (which functions just like a miniature Victor) plugged into a PWM port.
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Art Dutra IV
Robotics Engineer, VEX Robotics, Inc., a subsidiary of Innovation First International (IFI)
Robowranglers Team 148 | GUS Robotics Team 228 (Alumni) | Rho Beta Epsilon (Alumni) | @arthurdutra

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