Subject:
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Re: multi-device output controller
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Mar 1999 18:47:36 GMT
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Original-From:
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alex wetmore <alex@phredSPAMLESS.org>
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Viewed:
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955 times
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In my example the RCX output was just used to tell this mythical board
which output to drive. Power for the output came from a battery box,
always set to on. The RCX can't set direction on the battery box
(at least not trivially).
alex
On Fri, 26 Mar 1999, Lou Sortman wrote:
> There is no need to waste PWM levels on reverse. You can set the RCX motor output to
> reverse speeds as well, giving you 7 outputs (fwd and rvs) instead of 3 1/2. You need
> a bridge rectifier anyway; you might as well exploit it to indicate direction.
>
>
> alex wetmore wrote:
>
> > With a seperate battery box (from 8735 for instance) you could power the
> > output full time. In this case you'd probably want to map it to something
> > like this:
> > off - off
> > 1 - output 1 fwd
> > 2 - output 1 rev
> > 3 - output 2 fwd
> > 4 - output 2 rev
> > 5 - output 3 fwd
> > 6 - output 3 rev
> > full - output 4 fwd
> >
> > (if there is a 7 then you could get 4 outputs in fwd and reverse).
> > You would get a max of 9 (or 12) outputs, but I think that would
> > be plenty for most RCX-type robots (I still really haven't had to
> > go beyond 3 outputs, but I've mostly built vehicles).
> >
> > alex
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: multi-device output controller
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| Right. That is why you cannot use all 8 power levels. The polarity reversal that I am talking about is on the controlling (and only) output. I am already assuming, at this point, that drive power is stuck on as with your external battery box. (...) (25 years ago, 26-Mar-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: multi-device output controller
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| There is no need to waste PWM levels on reverse. You can set the RCX motor output to reverse speeds as well, giving you 7 outputs (fwd and rvs) instead of 3 1/2. You need a bridge rectifier anyway; you might as well exploit it to indicate direction. (...) (25 years ago, 26-Mar-99, to lugnet.robotics)
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