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In lugnet.robotics, Brian Davis wrote:
> In lugnet.robotics, Martijn Boogaarts wrote:
>
> > During LEGOWORLD 2005, we (Gerrit Bronsveld and Martijn
> > Boogaarts) have shown a -real-live-size- Pinball machine.
>
> And it is really impressive! Wonderful job, and a very nice write-up. A few
> questions:
>
> > - If you look close in the communication chamber we used the part
> > http://www.peeron.com/inv/parts/30208 30208 Cylinder 4 x 4 Hemisphere
> > Multifaceted to reflect the IR light to all the RCX units.
>
> Neat solution. I was wondering how you networked between the two IR
> communication chambers (the article is a little vague, refering to a "direct
> feedback loop" which could be anything). Also, as the point collector
> communicated with five other RCXs, how did you keep from loosing message in this
> chamber?
not sure what you mean:
but - we have 2 chambers, therfore 2 main listners, this made sure the point
collector (PC) was able to recieve all the points, and this RCX uses a
motor-rotation sensor-rotation sensor construction to transmit the points to the
newball RCX. thisone also has a Motor-rotoation-rotation construction to
feedback the counted points.
the newball RCX uses IR to send the points to the 2 RCX's used for the main
display.
>
> Also, the article mentioned that "So it was a real challenge to come up with
> a system to guarantee that the display and the 'internal' points are equal." How
> did you end up doing that?
mechanical (see above)
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1461377
>
> Again, your creation is a very wonderful application - I'm sure it was
> wonderful seeing the faces of all (kids & adults) as they saw this.
sure it was ! we enjoyed showing it to them.
(I plan to create a little movie so you can see it as well :)
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In lugnet.robotics, Martijn Boogaarts wrote:
> > I was wondering how you networked between the
> > two IR communication chambers (the article is
> > a little vague, refering to a "direct feedback
> > loop" which could be anything).
>
> not sure what you mean... this RCX uses a
> motor-rotation sensor-rotation sensor construction
> to transmit the points to the newball RCX. this
> one also has a Motor-rotoation-rotation construction
> to feedback the counted points.
You answered my question very clearly, thank you. This sounds like a nice
feedback system using the rotation sensors, and could be used to signal a lot of
things. Do you use a single axle connecting two rotation sensors where the axle
can be turned by either RCX (this would require two motors and two rotation
sensors), or does each RCX have a dedicated output system and a seperate
dedicated input system (this would seem to require two motors and four rotation
sensors).
I assume the RCX collecting the points would not have trouble with
simultaneous IR messages because only one "scoring event" would happen at any
one time (the ball could only hit at most one target or scoring device at a
time). Did the point collecting RCX need to identify where (which RCX) the
points were coming from?
> (I plan to create a little movie so you can see it as well :)
Fantastic - I look forward to seeing it!
--
Brian Davis
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In lugnet.robotics, Brian Davis wrote:
> In lugnet.robotics, Martijn Boogaarts wrote:
>
> > > I was wondering how you networked between the
> > > two IR communication chambers (the article is
> > > a little vague, refering to a "direct feedback
> > > loop" which could be anything).
> >
> > not sure what you mean... this RCX uses a
> > motor-rotation sensor-rotation sensor construction
> > to transmit the points to the newball RCX. this
> > one also has a Motor-rotoation-rotation construction
> > to feedback the counted points.
>
> You answered my question very clearly, thank you. This sounds like a nice
> feedback system using the rotation sensors, and could be used to signal a lot of
> things. Do you use a single axle connecting two rotation sensors where the axle
> can be turned by either RCX (this would require two motors and two rotation
> sensors), or does each RCX have a dedicated output system and a seperate
> dedicated input system (this would seem to require two motors and four rotation
> sensors).
have a look at the following deep link;
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1490167
We used 2 motors 2 axles and 4 rotation sensors:
one set for signals towards the newball RCX and one back towards the Points
Collector RCX.
> I assume the RCX collecting the points would not have trouble with
> simultaneous IR messages because only one "scoring event" would happen at any
> one time (the ball could only hit at most one target or scoring device at a
> time). Did the point collecting RCX need to identify where (which RCX) the
> points were coming from?
Right only one IR message at a time.
there is no indication where the points came from, since this is not nessary
information.
>
> > (I plan to create a little movie so you can see it as well :)
>
> Fantastic - I look forward to seeing it!
I did not have the time yet to make a nice movie please have some more pacient.
in the mean time look at this:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1490235
and the main, pinball link (maybe not yet working)
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=154358
Martyn
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