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Alex Wetmore wrote:
> From: Clay Aucoin <caucoin@cruiseshoppes.com>
> > Another was to put a plastic bag at the bottom of the plates. This got me
> > thinking that maybe there could be a way to create a sort of "tube" and • blow up
> > a small balloon inside of it?????
>
> If you are willing to use non-lego pieces then just use a couple of 20oz
> soda bottles filled with air and sealed. They are essentially free.
> I think bottles r the beginning of a workable idea. Perhaps u could
> use an empty l bottle that have the neck displaced to one side (like a motor
> oil bottle). Insert in the cap a tire plug or similar chunk of rubber.
> secure the rubber cork w/silicon glue, & puncture a needle sized hole in the
> center of it. It needs to be small so that it will grip tight on a pump
> needle like is used to inflate a ball. Then u could simply unscrew the cap to
> feel it up halfway w/water. Put the cap back on, & use a regular hand pump
> to pressurize the bottle vis the hole in the rubber cork. This would
> hopefully give u enough power to move, while at the same time, lasting long
> enough to let your robot play around for a while. Just remember to set the
> bottle w/ neck side low, so that u dont lose your air w/out expelling water.
Some complications i would see w/this is that #1, u would have to
use it immediately after pumping because there is no way to stop the air-flow
(unless u could cork it w/a needle or something).
#2, it will probably not propell the boat evenly. Depending on the
angle of the exhaust hole, & the stability of the bottle, its not going to want
to move in a straight line.
This may be correctible to an extent by using a pre-fabricated spout (such as
in the neck of those squeeze bottles of pure lime juice, or detergent) instead
of the rubber plug mentioned earlier. Even w/this the spout will need to be
set perfectly straight in the cap of the tank. The bottle will also need to be
secured to the boat w/great care.
One way or another, w/a little luck, this might propel your boat. : )
Goblintrain
>
> alex
>
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Ok, I don't think this is too far off-topic.
At the JavaOne keynote presentation this morning in S.F., James Gosling and
Kay Neuenhofen of Sun Microsystems demonstrated Mindstorm tanks controlled
from Palm V's running KJava aka MicroJava.
They also said that the Mindstorms and the Palms were proxied into Jini
devices by a Sparcstation server.
You can watch a webcast of the presentation at
www.graham.com/broadcasts/sun/JavaOne-99/keynote1/keynote1.html
The Mindstorms segment runs from 1:30:18 thru 1:35:00 (that's 90 minutes
from the start), so you might want to fast-forward a bit.
---------------------------------------------
Here's an excerpt (at 1:32:40):
Neuenhofen: The tanks come up first and they implement a controllable
interface and the Palms are then looking for something that implements a
controllable interface and they then start controlling the tanks. So it's a
spontaneous creation of a Jini federation.
Gosling: The tanks themselves are actually not running Java, they're being
proxied.
Kay: The tanks are too small at the moment to run Java so they run their own
proprietary Lego operating system, and ...
(crowd laughs)
They are.
---------------------------------------------
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Did you check the web site first?: http://www.crynwr.com/lego-robotics
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For those who want to see how this kind of thing is done,
independently I wrote a Jini/MindStorms driver as part of my Jini
tutorial. It is at
http://pandonia.canberra.edu.au/java/jini/tutorial/Jini.xml
Jan
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On Tue, 15 Jun 1999, David Kadansky wrote:
>
> Ok, I don't think this is too far off-topic.
>
> At the JavaOne keynote presentation this morning in S.F., James Gosling and
> Kay Neuenhofen of Sun Microsystems demonstrated Mindstorm tanks controlled
> from Palm V's running KJava aka MicroJava.
>
> They also said that the Mindstorms and the Palms were proxied into Jini
> devices by a Sparcstation server.
>
> You can watch a webcast of the presentation at
> www.graham.com/broadcasts/sun/JavaOne-99/keynote1/keynote1.html
>
> The Mindstorms segment runs from 1:30:18 thru 1:35:00 (that's 90 minutes
> from the start), so you might want to fast-forward a bit.
>
> ---------------------------------------------
>
> Here's an excerpt (at 1:32:40):
>
> Neuenhofen: The tanks come up first and they implement a controllable
> interface and the Palms are then looking for something that implements a
> controllable interface and they then start controlling the tanks. So it's a
> spontaneous creation of a Jini federation.
>
> Gosling: The tanks themselves are actually not running Java, they're being
> proxied.
>
> Kay: The tanks are too small at the moment to run Java so they run their own
> proprietary Lego operating system, and ...
>
> (crowd laughs)
>
> They are.
>
> ---------------------------------------------
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
Jan Newmarch, Information Science and Engineering,
University of Canberra, PO Box 1, Belconnen, Act 2616
Australia. Tel: (61) 2-62012422. Fax: (61) 2-62015041
AARNet: jan@ise.canberra.edu.au
WWW: http://pandonia.canberra.edu.au
"Microsoft gives you Windows. Linux gives you the whole house."
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Since I wrote this, I've seen the setup in person.
The Palm V's are connected serially to a Sun PC which broadcasts IR from a
standard Lego IR tower to the tanks' combat arena.
The messages sent to the tanks use 3 bits for the tank id and 5 bits for
encoding commands. The PC broadcasts to each RCX in turn. I imagine that the
RCX responds with its status when polled.
Each tank has two motors driving treads. Two rotation sensors report back to
the PC to track the tank's movements.
A third motor turns a cam that fires the weapon, a finger-sized laser
pointer. A light sensor detects laser hits from enemy tanks.
I counted four Palms and four tanks. Unfortunately, I won't be returning
Friday when the conference attendees get to play.
David Kadansky wrote:
>
> Ok, I don't think this is too far off-topic.
>
> At the JavaOne keynote presentation this morning in S.F., James Gosling and
> Kay Neuenhofen of Sun Microsystems demonstrated Mindstorm tanks controlled
> from Palm V's running KJava aka MicroJava.
>
> They also said that the Mindstorms and the Palms were proxied into Jini
> devices by a Sparcstation server.
>
> You can watch a webcast of the presentation at
> www.graham.com/broadcasts/sun/JavaOne-99/keynote1/keynote1.html
>
> The Mindstorms segment runs from 1:30:18 thru 1:35:00 (that's 90 minutes
> from the start), so you might want to fast-forward a bit.
>
> ---------------------------------------------
>
> Here's an excerpt (at 1:32:40):
>
> Neuenhofen: The tanks come up first and they implement a controllable
> interface and the Palms are then looking for something that implements a
> controllable interface and they then start controlling the tanks. So it's a
> spontaneous creation of a Jini federation.
>
> Gosling: The tanks themselves are actually not running Java, they're being
> proxied.
>
> Kay: The tanks are too small at the moment to run Java so they run their own
> proprietary Lego operating system, and ...
>
> (crowd laughs)
>
> They are.
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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