Subject:
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color sensor: was ( 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 00:10:59 GMT
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Original-From:
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Joel Shafer <joel@connect.+saynotospam+net>
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Viewed:
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627 times
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At 11:17 PM 9/17/99 +0000, you wrote:
> On a (somewhat) related note: How would it be possible to use three light
> sensor, with some sort of colored filter setup to differentiate color? Most
> importantly is there any way to combine thier input into one sensor port? I
> can image some ways using two ports, but if there was some way to use the raw
> value to tell predominant color (say 0 - 300 for red, 400-700 for blue,
> etc..)
> from one port, that would be interesting.
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 three sensors, save the results then send the
them to the port one color at a time. It could alternate the top bit so
that the software could determine which color reading was coming
in. Pretty far fetched I'm sure...
Joel Shafer joel@connect.net
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Message has 1 Reply:
 | | Re: color sensor: was ( Light sensor values)
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| Pure-Lego (but more than one input/output unless a motor can be driven off of the output to a light sensor and the input from a light sensor and rotation sensor can be multiplexed): 1) 1 light sensor 2) 1 (micro)motor to drive the rotation of the (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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Message is in Reply To:
| | RE: Light sensor values
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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 (...) (25 years ago, 17-Sep-99, to lugnet.robotics)
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