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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Thu, 15 Jul 2004 19:46:57 GMT
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Viewed:
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3934 times
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In lugnet.robotics.rcx, Sam Kabra wrote:
> I'm new to mindstorms so I have a simple question. At work, we're trying to
> measure the light tightness of rings. Basically this involves observing how much
> light passes through the outside edge of a ring. Is there any way a mindstorm
> light sensor or vision command can do this for us?
Sam,
By default programming when you configure a sensor input to be a light sensor,
it gives you back readings in the 0-100 range (i.e. percentage of the maximum
possible reading). To get better resolution (which I expect you might want),
you could consider setting up the sensor input as a raw input. Raw inputs have
a minimum reading of 0, and a maximum reading of 1023. Raw sensor readings can
give at most about 10 times the reading resolution as non-raw light sensor
readings.
I think that raw light sensor readings are smaller for more light, and larger
for less. I'd guess this is correct because of the way photo-ransistors work.
I'd also expect that you can get a reading of 1023 if the sensor is in complete
dark, but that you can never get a reading of zero.
Kevin
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Message is in Reply To:
 | | Light Sensor question
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| I'm new to mindstorms so I have a simple question. At work, we're trying to measure the light tightness of rings. Basically this involves observing how much light passes through the outside edge of a ring. Is there any way a mindstorm light sensor (...) (20 years ago, 8-Jul-04, to lugnet.robotics.rcx)
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