Subject:
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RE: Worm Drive Question
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 26 Nov 1998 00:20:13 GMT
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Original-From:
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Eric Hodges <ERIC.HODGES@spamcakePLATINUM.COM>
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Viewed:
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2284 times
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I don't think you'll be able to mimic a real elevator with an RCX. There
just aren't enough inputs. You'll need some sort of sensor on the car to
tell it when it is lined up with a floor. You'll need a pair of sensors on
each floor to request an up or down trip. You'll need n sensors inside the
elevator to indicate a destination floor. Not to mention the motors used
The real problem is telling the elevator where to go once you've got it
stopped. And who is going to get on an elevator run by a Lego robot,
anyway? :)
-----Original Message-----
From: Louis-Marius Gendreau [SMTP:lmg@admin.clic.net]
Sent: Wednesday, November 25, 1998 1:24 PM
To: 'lego-robotics@crynwr.com'
Subject: RE: Worm Drive Question
But what I propose is initialize on ground floor Floor = 1 and then just go
Floor=Floor+1 or Floor=Floor-1 each time you "feel" a bump. So you don't
need "bits". It is less elegant, but it allows for more floors. I wonder
if real elevators work like that? Probably not!
Now that does not solve the problem of knowing where the elevator was
called
either...
-----Original Message-----
From: CERRINA, Benoit [mailto:Benoit.Cerrina@rp-rorer.com]
Sent: Wednesday, November 25, 1998 4:10 PM
To: 'lego-robotics@crynwr.com'; 'Louis-Marius Gendreau'
Subject: RE: Worm Drive Question
This is exactly what he was proposing without the bottom floor sensor, his
problem however was how to tell the elevator where to go, with only two
sensor slot left he can only input a 2bit number ie from 0 to 3 hence four
floors.
However here is another way to do the floor number you could use the light
sensor and a paper band with shades of grey you slide it in front of the
sensor and push a button when its at the right place
IIIII
IIII
III
[===] II
I
III = shades of grey on the Paper
[===] light sensor
Benoit Cerrina
(610) 454 8347
Benoit.cerrina@writeme.com
http://www.geocities.com/SiliconValley/Peaks/2404/
> ----------
> From: Louis-Marius Gendreau
> Sent: Wednesday, November 25, 1998 3:54 PM
> To: 'lego-robotics@crynwr.com'
> Subject: RE: Worm Drive Question
>
> If you do not want to be limited to four floors you could have one long
> rod
> with "bumps" at every floor. With something sticking out of the elevator
> car, you know you have reached a floor everytime the rod is lifted from
> the
> ground. If you want to be able to set ground 0 to know where to start
> counting you can put a sensor under the elevator car so it knows it is on
> the ground. You then you need a kind of initialize routine.
>
> |
> |
> |
> ->
> |
> |
> |
> ->
> | _
> | <-| |
> | -
> ->
> |
> etc...
> |
> |
> S
>
> S = sensor
> | = rod
> -> = spokes sticking out of rod
> <- = spoke stiking out of elevator to lift the rod
>
>
> The other way is to put a sensor on the elevator car that detects the • bump
> on every floor. That's much simpler but the brick and motor get to be on
> the
> car and hence it gets to be pretty big.
>
> --
> Louis-Marius Gendreau
> Prisident, ClicNet Tilicommunications, Inc
> Qui: 418-686-2542 Fax: 682-6247
> Mtl: 514-875-8830 Fax: 875-0571
> lmgendreau@clic.net
>
>
> -----Original Message-----
> From: John Scott Kjellman [mailto:jkjellman@ameritech.net]
> Sent: Wednesday, November 25, 1998 12:07 PM
> To: LEGO Robotics List
> Subject: Re: Worm Drive Question
>
>
> Just to toss in my three cents (inflation adjusted to 1998 rates ;-)
>
> It seems there are two more options that might be a little easier:
>
> 1) My kids have gotten a couple of Lego sets that contain a long square
> shaft that has teeth on it. It mates to a large brick that contains a
> small gear attached to a shaft. If you insert the rod into the brick
> and turn the shaft the rod moves in/out (or up/down, depending on its
> orientation). This has a travel of about 8 inches.
> [SNIP]
>
>
> I was thinking about building the same thing (my 4 year old loves Legos
> and elevators). I had planned on approach 2) coupled with a long rod
> connected to a touch sensor. The rod would have wedge shaped bumps at
> every floor so that as the elevator passed it would trigger the touch
> sensor. that way you would know what floor you were on. You could then
> use the other inputs for the floor buttons (four floors would be the
> maximum without an extremely clever mechanism to allow the reuse of the
> third input).
>
> Oh well, enough rambling...
>
> Take care,
> KJohn
>
> stephen p spackman wrote:
> >
> > Matt Sailors wrote:
> >
> > > > Sorry I Lost you there, what do you mean by cut Lego?
> > > >
> > > > Tim
> > >
> > > I mean cut threads (like on a screw) into the axel using a thread
> > > cutting tool (part of a tap and die set available at most good • hardware
> > > stores). Check out http://www.net-info.com/~dcarlson/ near the • bottom
> > > of the page.
> >
> > Sure, you can do this with puppies, too! Ick, shudder!
> >
> > ("Arthur, Arthur, come quick! Someone's knurled the cat!"
> > - hypothetical Monty Python skit)
> >
> > stephen
>
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