Subject:
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Re: Has anyone figured out how to improve the NXT light sensor?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 18 Dec 2006 18:38:23 GMT
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Viewed:
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13499 times
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In lugnet.robotics.nxt, Philippe Hurbain wrote:
> What kind of application needed this precision? Line follower?
Yes. I didn't end up using it because speed ended up being more critical than
precision, but for narrow lines I may go back to it. I suspect I might be able
to use it to follow lines drawn by a black marker.
> Did you need to shield the fiber to avoid stray coupling of
> light to the phototransistor?
No. Well, kind of. I used a 1x2 Technic beam with a "stud pin" in the hole to
securely hold the fiber, and placed this right over the front face of the
olod-style light sensor. The first time I did this, it didn't work at all...
because there was almost no ambient illumination to get a reflected signal from.
When I tried it, I can't remember but I think I used a LEGO lamp as a light
sensor for surface illumination. You should be able to do this with the LED
light as well I'd guess.
--
Brian Davis
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Active threads in NXT programmable brick
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