Coming to the basics, colors are just
functions of frequency and wavelength. For all the multi colored gadgets we see
around us: televisions, mobile phones, tablets, handheld gaming consoles etc
etc all have their screens working on this game of frequency and wavelength
only. When one can make a gadget emit waves of a particular frequency, it is
particularly difficult to make a device which is able to recognize a color. In
electronics, the frequency-wavelength extends to voltage supply to the light
sources to get various shades of a color. On this principal is what the LCD, LED and
other high definition screens are based.
Shown here is an Arduino based color detector circuit which uses photodiodes and is able to
detect the color which is dominating in the given picture/scene. Adding open source hardware like Arduino
makes such systems to be developed by any curious mind who intends to do it.
Moreover, this circuit can even be tested on the breadboard meaning that no
specialized PCB is needed.
The outputs can be taken in quite varied form, for
instance, one can make a color sensitive gadget, show the output on a computer
monitor or program Arduino to show color on the LCD.
Want to make this circuit? Click here to
find out some exclusive images, codes and content detailing with the basics and
DIY’n of this circuit.
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