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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Fri, 17 Sep 1999 22:24:01 GMT
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Viewed:
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593 times
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One the raw note, my CdS cell (which measures about 20K ohms in the near dark, and about 500 ohms
pointed at the florescent light) returns raw values between 1000 (pointed into a dark blue coffee cup) to
48 (pointed directly at the light with a focusing mirror). I hope to use this large dynamic range to
differentiate between different objects in the room....
Jeff
Jeffrey.hazen@northmill.net
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Message has 2 Replies:
 | | 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)
| | | color sensor: was ( Light sensor values)
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| (...) It seems like you could get about 3-4 bits for each color if you were only using one input port. That's not very good resolution. Perhaps a better way would be to design a color sensor and use a pic chip for it's brain. It could sample all (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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