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From: "Adrian M Jansen"
Subject: Re: Detecting colored objects
X-Newsreader: Microsoft Outlook Express 5.00.2919.6600
Date: Wed, 30 Oct 2002 08:53:37 +1000
NNTP-Posting-Date: Wed, 30 Oct 2002 09:53:09 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
Photocells are not inherently color sensitive. What you normally do is have
2 or 3 different color light sources, and read the photo response to each
incident color in turn. Then the 2/3 response values give you a way of
matching the color to a table of possible colors. Its still a difficult
problem, because you have to allow for variations in light level and surface
reflectivity, but it can be done.
Adrian Jansen email@example.com
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
"Harry Dellamano" wrote in message
> I would like to candle eggs that have 11 possible solid colors rolling
> an assembly line. Once the color is determined a microprocessor will drop
> them into the correct bin. I do not know the best way to detect color on
> fly. It would be nice if a photocell would put out different current
> that can be calibrated and detected by a threshold detector. Once I get by
> the light to electronic transducer I am home free. What is the best photo
> detector and light source for this job??
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