Subject:
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Re: Lightsensor
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sun, 4 Jan 2004 20:07:57 GMT
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Viewed:
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3827 times
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Matthias Spinnler wrote:
> > The lightsensor shows only a range of 37/47 in view-mode
> > between black and white.
Keep in mind a "dynamics range" of 10 units is just fine, if the variation is
normally only a couple units. In other words, you can reliably determine when
you are seeing a light or dark surface. Making sure that the sensor is close (5
mm or closer is nice) to the surface of interest and always the same distance,
and always the same ambient light level (how? by shielding the area from any
light not emitted by the sensor itself).
> ...this is not satisfying at all because the sensors dynamic
> range is to low for reasonable applications.
One possibility (at least with other programming enviroments) is to read the
raw value from the sensor, which is roughly 10 times higher resolution. I'm not
sure how to do this with the RIS language (anybody?). But it has it's own
problems as well; specificly, higher resolution doesn't mean better,
particularly in noisy signals (without processing).
--
Brian Davis
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Message is in Reply To:
 | | Re: Lightsensor
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| (...) Hi Thomas facing the same problem since very few days (I'm also a nebie) it seems that this behaviour is 'normal'. However this is not satisfying at all because the sensors dynamic range is to low for reasonable applications. Is there someone (...) (20 years ago, 4-Jan-04, to lugnet.robotics.rcx)
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