Subject:
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Speed Computer?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 11 May 2001 14:58:41 GMT
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Original-From:
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John Barnes <barnes@NOMORESPAMsensors.com>
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Viewed:
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673 times
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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 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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