Subject:
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Re: RCX motor voltage
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Mon, 8 Nov 1999 23:34:48 GMT
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Viewed:
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1426 times
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Mario Ferrari wrote:
>
> Wes Matchett <wes@augustschell.com> wrote:
> > I've completed a syncro drive model to be RCX controlled and have • encountered an
> > unexpected barrier. The model's drivetrain was tested using a battery box • (6
> > AAs) and works fine. But when I try to drive it with the RCX it doesn't • have
> > enough power to move. The batteries in the RCX are new - in fact, I moved • them
> > from the RCX to the battery box to verify they could do the job, and they • did.
> >
> > Any ideas on getting more power from the RCX?
>
> Yes, using a direct connection to a battery box your motors get more power.
> I don't know if this idea is applicable to your model, but you could use one
> motor attached to the RCX to drive the switch of the battery box, or even
> better an external Lego switch (5120).
These solutions bring up problems of their own: using a motor to operate a
switch (battery box or Lego switch) requires monitoring the switch state to
determine on/off status. Also, there will be a time delay while the motor moves
from one state to another.
I guess the best solution is to drive a relay with the output port. By using
two relays I _think_ they can wired to connect a battery pack in a fwd/rev
manner. I need to give this some more thought.
-Wes
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Message has 2 Replies:
 | | Re: RCX motor voltage
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| (...) I can think of two other possibilities: The best approach is probably to add more gears so that the motors don't have to work as hard to move the platform. The platform will move more slowly, but at least it will move at all. (Hmm... That (...) (25 years ago, 8-Nov-99, to lugnet.robotics.rcx)
| | | Re: RCX motor voltage
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| Wes, relays would work pretty well. (Still, how much current do your motors draw???) The LEGO motors draw about .35 Amps (350 Milliamperes) You could connect two 5V coil relays , each with a diode in series with the coil, connected oppositely to (...) (25 years ago, 9-Nov-99, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: RCX motor voltage
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| (...) encountered an (...) (6 (...) have (...) them (...) did. (...) Yes, using a direct connection to a battery box your motors get more power. I don't know if this idea is applicable to your model, but you could use one motor attached to the RCX (...) (25 years ago, 8-Nov-99, to lugnet.robotics.rcx)
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