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 19:02:11 GMT
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Viewed:
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2919 times
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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.
alex wetmore wrote:
> 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
>
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Message is in Reply To:
 | | Re: multi-device output controller
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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 (...) -- Did (...) (28 years ago, 26-Mar-99, to lugnet.robotics)
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