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???
05/05/09 07:51
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 		 #165058 - You missed the point!
Responding to: ???'s previous message
Jecksons Ben said:
>You are aware, aren't you, that chips are readily available to do this - and >with a direct digital output?

You didn't answer that question!

The colour rod semitransparant.

Pardon?

LDR (light different resistor)

Actually, it stands for Light-Dependant Resistor - that is, its resistance depends upon (ie, varies with) the intensity of light falling on it.

which very common used at road light.

Yes - but that's nothing to do with colour sensing, is it?

That's purely to detect if it's currently "dark" or "bright" - so that the lights are only switched ON when needed (ie, when it's "dark")

They are also commonly used in traffic signals; but, again, that's just for a simple dark/light detection - so that the signal intensity can be increased for daytime visibility, or decreased to prevent dazzle at night.

Nothing to do with spectral analysis!

List of 44 messages in thread
TopicAuthorDate
simple Colour sensor            01/01/70 00:00      
   LDR spectral response            01/01/70 00:00      
      the colours rod transparant....            01/01/70 00:00      
         Didn't answer the question            01/01/70 00:00      
            with common red 5mm led            01/01/70 00:00      
               Insufficient!            01/01/70 00:00      
               Does not sound like a solution, but please link            01/01/70 00:00      
                  with bulk lamp 1.5-VDC torch            01/01/70 00:00      
                     bulk lamp?            01/01/70 00:00      
                        Meant            01/01/70 00:00      
                     You haven't searched, have you?            01/01/70 00:00      
                        Had searched            01/01/70 00:00      
                           I'm only googling the cheap solution.            01/01/70 00:00      
                              for...            01/01/70 00:00      
                                 bulk lamp            01/01/70 00:00      
                                 Measuring color is way harder than you think!            01/01/70 00:00      
         You missed the point!            01/01/70 00:00      
            Calibrated is the problem            01/01/70 00:00      
               Test what?            01/01/70 00:00      
   There is a simple solution            01/01/70 00:00      
      Lots of work            01/01/70 00:00      
      Thank's            01/01/70 00:00      
         How?            01/01/70 00:00      
            something...            01/01/70 00:00      
               this colour            01/01/70 00:00      
                  Controllable? Repeatable?            01/01/70 00:00      
                     Fading a big problem            01/01/70 00:00      
                        why all the 'fiddle'            01/01/70 00:00      
                           I want cheap crap            01/01/70 00:00      
                              it's Christmas in June            01/01/70 00:00      
                                 fishing line            01/01/70 00:00      
                                    ooooohhh look what I found            01/01/70 00:00      
                                       Beat you to it!            01/01/70 00:00      
                                       I sticky            01/01/70 00:00      
                                          LED bulk lamp?            01/01/70 00:00      
                                             Bulk lamp - he means a torch (or "flashlight")            01/01/70 00:00      
                                                LED or bulk lamp            01/01/70 00:00      
                                                   Not color but changes in color            01/01/70 00:00      
                                                      Yes...Correct            01/01/70 00:00      
                        with black small tube            01/01/70 00:00      
                     Colour-ish            01/01/70 00:00      
   just thought of it            01/01/70 00:00      
      Glass filters good but normally expensive            01/01/70 00:00      
         Jacksons duality            01/01/70 00:00      

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