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We have seen single color LED detection before, fjordcarver has built a DIY Color Detection using an RGB LED that can detect the actual color of the object placed in front of the home made sensor. “For this sensor you will need
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December 16th, 2011
Diodes are incredibly versatile!
Much to my amazement, I was able to use an unpowered crystal radio, which uses a standard 1N34a diode, to detect colours from a computer screen.
The radio discerns colours by receiving the high frequencies emitted by the screen, and through the diode converting them to audio signal. Then I modify the radio’s audio signal through real-time software called Audio Hijack Pro. Here’s a movie of that experiment: http://www.youtube.com/mrfixitrick#p/u/21/aPEJtXhGiI0
The 1N34a diode itself will also respond to direct light of various kinds.
Here is a great link that shows 40 different circuits for germanium diodes from an old-time 1952 Sylvania book, “More New Uses For Germanium Diodes” :
http://n4trb.com/AmateurRadio/SemiconductorHistory/Crystal%20Diode%20Circuit%20Kinks.pdf
December 17th, 2011
[...] ORIGINAL ARTICLE: http://hackedgadgets.com/2011/12/16/diy-color-detection-using-an-rgb-led/ [...]
December 19th, 2011
It’s a great idea and a surprisingly simple implementation! Before reading the instructable I thought colored glass filters would be involved but it’s even simpler than that. I guess, some sort of a lens to focus on the object you’re most interested in would help but even in the simplest version I think it should still be useful for, say, making a robot that follows a red line but not the blue. A great little gem of a circuit that can come handy one day!
January 1st, 2012
[...] Here is a fun idea that could be leveraged into several interesting projects. It uses an RGB LED and a CdS photocell to detect the color of any object. Here‘s another really cool version of the same project, where a ball changes color to match the surface you put it on. Leave a comment [...]