Subject:
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Re: New Lego challenge !
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 16 Sep 1999 08:29:37 GMT
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Original-From:
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S. Crawshaw <{sc10003@eng.cam.ac.}nospam{uk}>
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Viewed:
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784 times
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On Wed, 15 Sep 1999, Paul Speed wrote:
<snip>
> > or y direction (because of friction, a bot cannot make severall precise
> > 90 degree turns). We need a compass to do that.
>
> Actually, a synchro-bot is pretty good at this. In case you
> missed previous threads, this 'bot is one that the direction of all
> of its wheels are synchronized. The robot can drive in any direction
> but its orientation never changes. • <snip>
> One downside of this design is that it is impossible to
> make with stock Mindstorms parts. The most compact designs all
> use the turntable piece (mine is only one brick width wider than
> two turntables.) and still aren't very compact.
Depending on how you define "stock Mindstorms parts", you _can_ make a
synchro-bot. You can use a differential instead of the turntable, hence
you need one RIS for each wheel! This method can be an even more compact
design (in the horizontal direction), although it is quite tall. (Sorry,
no pictures. No digital camera - yet)
[silly idea follows:]
How about building 3 (or 4) stand-alone 2-wheeled 'bots (ie which can turn
on the spot and/or drive), and using each of these instead of a
turntable/wheel assembly. A "master" RCX mounted on the main body of the
'bot could send IR commands to the 3/4 RCXs on the little 'bots to tell
them what to do. Hey presto - a synchro-bot made with stock Mindstorms
parts ... of course, you need 4/5 RISs to do this design, but that's no
problem - everyone has at least half a dozen RISs don't they?!
[back to reality!]
Anyway, for a maze follower which only needs to move in the 4 "compass"
directions, why do this at all? Surely you could achieve this with two
sets of wheels fixed at 90 degrees to each other ... in fact, I might try
this to see if it can work.
Stuart
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Message is in Reply To:
 | | Re: New Lego challenge !
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| (...) Actually, a synchro-bot is pretty good at this. In case you missed previous threads, this 'bot is one that the direction of all of its wheels are synchronized. The robot can drive in any direction but its orientation never changes. With a (...) (25 years ago, 15-Sep-99, to lugnet.robotics)
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