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Subject: Re: Detecting colored objects
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X-Original-Trace: 1 Nov 2002 13:23:57 +1000, 188.8.131.52
Date: Fri, 01 Nov 2002 02:24:01 GMT
NNTP-Posting-Date: Fri, 01 Nov 2002 13:24:01 EST
Organization: Comindico Australia - reports relating to abuse should be sent to firstname.lastname@example.org
On Tue, 29 Oct 2002 09:58:05 -0800, "Harry Dellamano"
> I would like to candle eggs that have 11 possible solid colors rolling down
>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 the
>fly. It would be nice if a photocell would put out different current levels
>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??
You say 'solid' colors - but not if they be 'gloss' or 'flat'. A 'gloss'
color will reflect light much better than a 'flat' color which will absorb
light more. I suggest you might consider the possibilities of modifying a
color hand scanner normally used to hand scan into a computer colored text /
images from paper etc. & set one up mechanically / electronically on the
assembly line. These 'hand' scanners already have the requisite photo
detection electronics built-in and suitably calibrated for detecting all the
specified colors in the color chart as well as black & white. It will be much
easier to adapt one of these to your needs than to design / build / test /
improve / retest / install a new device - also these scanners
usually come with a fairly basic but informative 'user manual' which in most
cases will have the name / address / contact info of the manufacturer in case
you need to get more relevant engineering / electronics information on the
scanner if you go this path.
Have a good day!
(Retired - sometimes electronics tinkerer from OZ)
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