Subject:
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RE: slightly off topic: two questions (one of them for EE types)
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 25 Jan 1999 20:56:47 GMT
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Original-From:
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Roland Kippenhan <rkippenhan@transactor.ANTISPAMnet>
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Viewed:
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2803 times
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Speaking of which, I saw the train in the store the other day. I was
wondering, can the RCX control the train if I hook up an output to the
tracks?
> -----Original Message-----
> From: jasper@janssen.dynip.com [SMTP:jasper@janssen.dynip.com]
> Sent: Monday, January 25, 1999 3:46 AM
> To: lego-robotics@crynwr.com
> Subject: Re: slightly off topic: two questions (one of them for EE types)
>
> On Mon, 25 Jan 1999 05:03:00 GMT, Ben Erwin <berwin@tufts.edu> wrote:
> >
> > 1) Does lego sell the train controller separately, and for how much?
>
> Yep. Some sets (like 4558 - I got mine from a second hand 4558 I
> bought with the controller, and traded for a Mindstorms without :) )
> come without the controller, and you have to buy it separately. I
> believe MSRP is arounf $50 or $40, but you can often find them for $20
> or less in clearance season, i'm told.
>
> > 2) Is something wrong? When I look at the voltage it looks like a
> > pretty linear decrease for the full rotation, and I was under the
> > impression that the standard lego speeds (1-8) corresponded to equal
> > decrements of voltage out of 9 volts. I guess not(?)
>
> This is a pretty standard behavior for motors: they need a certain
> voltage to work at all. I justr read 5 messages ago, that the RCX uses
> Pulse Width Modulation for their motors (PWM), so that for speed 7,
> it'll be on for 7 ms, off for 1, etc. If you use the train controller
> to drive a Technic Motor (i have a really large helicopter as display
> model, the rotor-blades alone are 70 studs long), it scales pretty
> well from 0 to completely running, in an easy to adjust box. One
> caveat: I've opened up the train controller, it decreases the speed in
> steps, not stepless like with a pot. (It has the knob and the surface
> under it basically like most cheap multimeters, if you've ever opened
> one of those) --- Well, i have to go, so I can't finish this right
> now. Reply if you have any questions :)
>
> Jasper
> --
> 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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