Subject:
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Lght Sensor & Three colors?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 16 Jan 2001 04:31:09 GMT
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Viewed:
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1449 times
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Can the light sensor accurately distinguish between THREE colors? All the
designs I've seen work with two; e.g. a brick sorter, green & red.
And if so, what colors are recommended: Red, Green, Blue? Black, White,
Grey?
Thanks.
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Message has 5 Replies:
 | | Re: Lght Sensor & Three colors?
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| Matthew Fisher <matthew.fisher@bigfoot.com> wrote in message news:G78nAy.D0A@lugnet.com... (...) The LEGO light sensor is based on a silicon photo transistor. It really doesn't "see" the colors we do. It is sensitive to the near IR. That said, I'd (...) (23 years ago, 16-Jan-01, to lugnet.robotics.rcx)
| | | Re: Lght Sensor & Three colors?
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| I saw a 6th grade girl with a lego robot arm that could sort about 10 different lego colors using the light sensor. It was amazing. It wasn't the RCX, but the light sensor was the same. She actually brought in her pink and purple LEGOs from home (...) (23 years ago, 6-Feb-01, to lugnet.robotics.rcx)
| | | Re: Lght Sensor & Three colors?
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| (...) My card reader 2 reliably reads cards built with yellow, grey and black plates ((URL) problem in brick sorters is that slight modifications of brick positions can cause more variation in reflected light than color. Take care too of specular (...) (23 years ago, 7-Feb-01, to lugnet.robotics.rcx)
| | | Re: Lght Sensor & Three colors?
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| (...) The light sensor doesn't actually "see" colors, it only distiguishes between dark and light. Therefore I have found that using different grey scales is a good way to make distinguishable "colors". Different grey scales can be made by printing (...) (23 years ago, 7-Feb-01, to lugnet.robotics.rcx)
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