Subject:
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Re: Black
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 29 Jan 2000 01:06:24 GMT
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Viewed:
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2699 times
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In lugnet.robotics.rcx, Mike W. Burger writes:
> Since I am currently working on line following, I did some tests
> with the Lego active light sensor. I mounted one on a small
> test cart pointing down a bit more than 1/8 inch above the
> "ground".
>
> The 1.5 test pad reads
>
> white 57
> black 38
> green 46
>
> I went through a book of construction paper. The results were
> surprising. This sensor sees a lot of things as white; reds,
> yellows, oranges, greys, lavenders, browns all reading 55-56,
> even 57. The construction paper black was a disapointing 47.
Keep in mind that the light sensor generates a red light, so you're really
measuring the reflectivity of the target in the red part of the spectrum. Thus
red is as reflective as white (some of the other results, e.g lavendar, are
still pretty weird).
Regards,
Steve Hodge
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Message has 1 Reply:
 | | Re: Black
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| (...) True, I was shocked at all the colors that were "white". I think part of this is due to the poor quality of the construction paper. Close examination indicates a fair amount of unstained fiber, for instance the black read a lousy 47, compared (...) (25 years ago, 29-Jan-00, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Black
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| Since I am currently working on line following, I did some tests with the Lego active light sensor. I mounted one on a small test cart pointing down a bit more than 1/8 inch above the "ground". The 1.5 test pad reads white 57 black 38 green 46 I (...) (25 years ago, 28-Jan-00, to lugnet.robotics.rcx)
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