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Subject: 
RE: Worm Drive Question
Newsgroups: 
lugnet.robotics
Date: 
Wed, 25 Nov 1998 21:38:04 GMT
Original-From: 
Tim McSweeney <TIM@ihatespamAMS.CO.NZ>
Viewed: 
2230 times
  
I take it all you merkins are on holiday?  go and eat some Turkey and let me
get some work done.


ObLego:

A Cleaner (and more expensive) way to do this is to mount the Sensors on the
shaft and have them all plugged into the RCX when the lift gets to a floor
the sensor triggers.  If you used the Cybermaster sensors with the resistors
you could detect three floors accurately via one input.  The advantage to
this is that you don't need a cable trailing up and down the lift shaft ==
tangles.

Tim



-----Original Message-----
From: Louis-Marius Gendreau [mailto:lmg@admin.clic.net]
Sent: Thursday, November 26, 1998 10:24 AM
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





Message is in Reply To:
  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 (...) (26 years ago, 25-Nov-98, to lugnet.robotics)

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