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 03:36:19 GMT
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Viewed:
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1631 times
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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
As far as I can tell, there's no real pattern to the readings.
What sort of test did you use to show that this method would actually work?
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Message has 1 Reply:
 | | Re: Competitive MINDSTORMS: try again...
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| (...) 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 (...) (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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| (...) Yes, that's correct. (...) There is one piece of missing information you've missed that is causing the confusion: When the program starts, the program doesn't put the normal light value of the room into the variable thresh - read this from the (...) (20 years ago, 20-Aug-04, to lugnet.robotics)
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