Subject:
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Re: Light sensor values
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 18 Sep 1999 02:24:46 GMT
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Viewed:
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520 times
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Richard <richard@mailstart.com> wrote in message
news:FI88pu.4Js@lugnet.com...
> The light sensor I built takes over 5 seconds to change values completely • when
> going from a bright room to darkness, or vice versa. My infrared detector
> (which is based on a phototransistor) has no noticable response time (much
> like the official Lego sensor). Has anyone done better with various CdS
cells?
CdS sensors are pretty slow, but I don't think the ones I'm using take 5
seconds. I have used the Radio Shack 276-1657 and the Mouser 338-54C348
with good luck. CdS sensors have a nice wide spectral response and should
work well with Red, Green, and Blue filters to sense color. I never got
around to it, but I thought about making a plant seeking robot with this
combination.
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Message is in Reply To:
 | | Re: Light sensor values
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| (...) dark, and about 500 ohms (...) into a dark blue coffee cup) to (...) this large dynamic range to (...) I have a CdS based light sensor but do not use it often because of the slow response to changing light conditions. I know CdS cells can vary (...) (25 years ago, 17-Sep-99, to lugnet.robotics)
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