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Posted by jim dorey on July 21, 2005, 11:24 pm
> Hi,
> I need a simple color sensor for my robotic arm, which can basically
> discern between basic colors. I would like to build one, I'm guess it
> should be pretty simple using a photo cell, I just don't know how
> exactly.
> I found this schematic at
> http://www.lynxmotion.com/images/jpg/color.jpg
> But I don't understand what the circuit on the right (with the LED's is
> for). I understand that the circuit on the left with the CdS sends the
> voltage on I/O 12 depending on the color and intensity of the light,
> but will my robot know which color it is?
> Thanks
three ldr's in a tube each, adc the light level for each and ther ya go.
multichannel adc would work well enough, but a single with a 2-4 decoder
would work as well.
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> I need a simple color sensor for my robotic arm, which can basically
> discern between basic colors. I would like to build one, I'm guess it
> should be pretty simple using a photo cell, I just don't know how
> exactly.
> I found this schematic at
> http://www.lynxmotion.com/images/jpg/color.jpg
> But I don't understand what the circuit on the right (with the LED's is
> for). I understand that the circuit on the left with the CdS sends the
> voltage on I/O 12 depending on the color and intensity of the light,
> but will my robot know which color it is?
> Thanks