Subject:
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Re: Competitive MINDSTORMS: try again...
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 21 Aug 2004 14:20:40 GMT
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Viewed:
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1670 times
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In lugnet.robotics, Steve Hassenplug wrote:
> In lugnet.robotics, David Perdue wrote:
> > It might come as a
> > surprise, but your hand is a very good emulator of a sumo-bot when it comes to
> > calibrating the light sensor. You simply put your hand in front of the searching
> > light sensor,
>
>
> Again, this sounds really good, but it just won't work.
>
> Just to prove it to myself, I did a little test. I connected a light sensor to
> an RCX, and set it so I could read the values. As it turns out, I have four
> sumo robots sitting around, so I was able to test each of the robots in front of
> the sensor. I tested all the robots, and my hand, and then I rotated the light
> sensor 180 degrees, to minimize the effect of ambiant light in the room, and
> repeated the test.
>
> First, the light sensor read 53, with nothing in front of it. When I put my
> hand in fron (about 3-4 inches away) the reading dropped to 46. I tried all
> four robots, and the average reading was 50.75, just a bit above "hand" reading.
>
> Next, I turned the sensor 180 degrees, and the normal reading dropped to 45.
> Putting a hand in front of the sensor actually raised the reading to 50, and the
> average reading for a robot was 45.5
Here's a quote from the chapter:
"TIP It is a great deal of fun to try out different levels of sensitivity for
the searching light sensor.Hold out your hand farther when calibrating, and ZR1
will be very sensitive. Put your hand very close when calibrating, and ZR1 is
not nearly as sensitive."
So if you're having trouble recognizing the other sumo-bots with the searching
light sensor, just make it more sensitive by holding your hand out farther.
> What sort of test did you use to show that this method would actually work?
It sounds like what you're doing is about what I did, but here's another quote
from the chapter:
"NOTE The entire arena should be well lit when using ZR1. Although this should
be the case anyway, for ZR1, it is especially important. If one section of the
arena is darker than another section, ZR1 might actually think it is seeing the
opponent and switch to slow speed when it gets to that area. The entire arena
must be uniformly and brightly lit."
So make sure also that everything is brightly and uniformly lit in your testing
area.
Thanks,
David J. Perdue
www.davidjperdue.com
www.davidjperdue.com/competitivemindstorms
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Message has 1 Reply:
 | | Re: Competitive MINDSTORMS: try again...
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| (...) I suspect this is where theory departs from reality. That would be clear, if you had been to a LEGO sumo event. You seldom have control over the room lighting, much less the other robots. I've seen events where sunlight was shining directly on (...) (20 years ago, 21-Aug-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: Competitive MINDSTORMS: try again...
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| (...) Again, this sounds really good, but it just won't work. Just to prove it to myself, I did a little test. I connected a light sensor to an RCX, and set it so I could read the values. As it turns out, I have four sumo robots sitting around, so I (...) (20 years ago, 21-Aug-04, to lugnet.robotics)
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