Subject:
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Re: Speed Computer?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 7 Jun 2001 16:50:20 GMT
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Viewed:
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1727 times
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Hi,
I took my speed computer appart a while ago, but I finaly got around to
posting the pictures on my website at:
http://www.wegmuller.org/lego
Greetings,
David
In lugnet.robotics, John Barnes writes:
> It is not seperable. The wire comes out of the little sensor and
> goes straight into the display part.
>
> I had wondered the same thing. But I have not taken it apart yet!
>
> I ended up making my own rotation sensors using mouse parts.
> You get about 4 times the resolution with a mouse encoder wheel.
>
> I have not encountered the missing count problem with either device,
> the Lego rotation sensor or the mouse wheel version. But I have a
> touch sensor which I use as a home position sensor for initial
> cal. which I always use to trigger a clear command everytime it
> gets pressed. (I am using the rotation sensor to aim another
> sensor.)
>
> What I do use the speed computer for is calibrating motors. I use
> a 40:8 gear up to the speed computer as a "standard load" on the
> motor. I run the motor from a bench supply set to 9.00 volts.
> The rpm readings from the speed computer are divided by 5 and written
> on the bottom of the motors with fine point permanent marker.
>
> Then, when I build skid steer type platforms, especially ones with
> two or more motors per side, I simply choose a "matched set"
> of motors. I get good straight line performance and the motors
> don't fight each other.
>
> JB
>
>
> > Has anyone out there played with the Lego "Speed Computer" [5206] ?
> > It appears to contain some kind of rotation sensor - I wonder if it
> > could be made to work with the RCX - and perhaps avoid the missing
> > count problems of the RCX's rotation sensor ?
> > The photo on the ShopAtHome site doesn't show how the sensor is
> > hooked up to the computer unit - so it's not obvious whether it's
> > connected with a standard Lego connector or just hard-wired.
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Message is in Reply To:
 | | Speed Computer?
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| It is not seperable. The wire comes out of the little sensor and goes straight into the display part. I had wondered the same thing. But I have not taken it apart yet! I ended up making my own rotation sensors using mouse parts. You get about 4 (...) (25 years ago, 11-May-01, to lugnet.robotics)
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