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Colour sensor?

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Arislan:
http://www.lynxmotion.com/images/html/proj050.htm

I'm a bit confused by the above robot. Can someone explain how it can see colours? I don't see a camera attached to the robot.

JesseWelling:
I see that he has 3 trim pots and I'm guessing that's to tune the input from a wavelength specific photoresistor of some sort. maybe you could use celophane covered photoresistors....never really heard of it but.....

JesseWelling:
http://www.taosinc.com/
Just found this here : http://www.societyofrobots.com/robot_parts_list_sensors.shtml

dunk:
if you have a look here: http://www.lynxmotion.com/images/jpg/color.jpg you will get the idea.
it is illuminating the m&m with different colours of light.
switch on the different colours of led, one at a time and
a red m&m will reflect back more red light,
a blue one will reflect back more blue light,
etc.

dunk.

Arislan:
Thanks! I hadn't realised the meaning of "cds" on the schematic. This explains the meaning:
http://www.robotroom.com/ColorSensor.html

It looks like that researcher got a lot of good photoresistors for a bargain :S Unfortunately I moved to Brazil recently and nothing here is cheap.

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