Subject:
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Re: mindstorms NXT
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 6 Jan 2006 20:33:46 GMT
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Viewed:
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7566 times
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In lugnet.robotics, Yann Vernier wrote:
> In lugnet.robotics, Matthew Ruschmann wrote:
> > Actually, the RCX outputs 0's and 1's to power the motors as it is right now.
> > So all all you have to do is crimp your lego wires into a RJ11 and connect it to
> > the NXT and send it a digital PWM signal. Voila! Your old motor works again.
>
> I doubt that will do what you want. The RCX motor ports are equipped with motor
> drivers - ICs that can provide rather a lot of current, switch direction, and
> even short circuit the port. The digital wires would be I/O, not meant for
> noticeable current, and only 1 or 0. So you'd wind up with an NXT shutting
> itself off as the signal lines draw too much current.
> No, what will be needed in the adapter will be such a motor driver, speaking the
> appropriate serial protocol. Probably that means the device will contain a PIC
> or PLC along with one or more motor drivers, and will be inefficient to build
> for less than two motors per port. Personally I'm hoping for such a device with
> separate power input.
I see no other wires into the motors, which means all the current is coming from
that one connection. Whether or not there is separate supply and control lines
in that connector is debatable until we get our hands on one - I would prefer
not, because that may make it harder to use the motor for non-NXT applications.
ROSCO
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Message has 1 Reply:
 | | Re: mindstorms NXT
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| (...) From the LEGO NXT FAQ... "An electric motor whose speed or position is controlled by a closed loop feedback circuit that can sense its position. The speed of the motor is measured by a tachometer. The tachometer produces a voltage that is (...) (18 years ago, 8-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: mindstorms NXT
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| (...) I doubt that will do what you want. The RCX motor ports are equipped with motor drivers - ICs that can provide rather a lot of current, switch direction, and even short circuit the port. The digital wires would be I/O, not meant for noticeable (...) (18 years ago, 6-Jan-06, to lugnet.robotics)
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