Subject:
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Re: light sensor question
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Wed, 23 Jul 2003 18:17:03 GMT
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Viewed:
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3159 times
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In lugnet.robotics.rcx, Aaron Goodman wrote:
> In lugnet.robotics.rcx, Katie Panciera wrote:
> > I am writing a research paper about work I have done with Mindstorms this
> > summer. One thing that I used a lot was the light sensor, but I am having a hard
> > time finding what exactly the sensor measures. I was wondering if anyone could
> > give me any direction as to the units of the light sensor.
> > Thanks,
> > Katie
>
> Is this what your looking for?
> http://www.plazaearth.com/usr/gasperi/light.htm
>
> in terms of what units it mesures it in I don't think it really has any. it is
> just a relative reading from 0-100.
What I'm looking for is really the latter of the topics. It seems to me that it
must have some sort of units, because I've never seen it hit zero even with
alterations (as Ralph Hempel has described on his site). It seems like it should
be measuring some aspect of the light. I thought that I'd read somewhere that
the light sensor with the original firmware (I'm using brickOS) uses a scale
from 0-1000 but rounds that off and gives you 0-100. Any other thoughts out
there?
K
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Message has 1 Reply:
 | | Re: light sensor question
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| (...) The Analog to Digital converter of the h8/300 (the brains of the lego mindstorms) is 10 bits, so it has a range of 0-1023. I'm not sure how it converts that to the 0-100, it may do it by just dividing by 10 and rounding. If you want to see (...) (21 years ago, 24-Jul-03, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: light sensor question
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| (...) Is this what your looking for? (URL) terms of what units it mesures it in I don't think it really has any. it is just a relative reading from 0-100. (21 years ago, 23-Jul-03, to lugnet.robotics.rcx)
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