The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Subject: Re: Detecting colored objects
X-Newsreader: Forte Free Agent 1.21/32.243
X-Original-Trace: 1 Nov 2002 13:23:57 +1000, 220.127.116.11
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)
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup