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???
08/28/07 04:42
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#143680 - 3 sensors for one color
Responding to: ???'s previous message
Hello Stefan,

I have tried my best to explain you my application but I think you are still not clear on that.
I will try again.
Actually I am developing a sorting system which will sort objects on its colors.
My objects are very small,average size is 5mm-6mm.
This objects are in motion on a black conveyor(speed approx 420mm/sec)
My sensors(TAOS's TCS230)are mounted in travel path of the objects.sensor1 for R,sensor2 for G,sensor3 for B
Distace betwn them is 24mm.Time taken to read each object correctly by each sensor is 8msec by increasing illumination the value goes to 6msec.
Currently I am using trigger to read the objects.
I have achieved great results ie I am able differentiate objects with slight variations also.
But the problem is these objects have to passed through all the sensors before the next object arrives.
So I decided to read this objects simulataneously using RTOS.
Which I then thought will be very complex and I have not worked on it before.
Also I cannot poll to eliminate trigger because I have to poll for atleast 8msec to diffentiate between conveyor and my objects.
So I have to read the object when it is exactly in the centre of the sensor.
My question is that is there anyway out or I have to change my approach.
I have also have Avago's Digital color sensor with response time of 15usec.
But I have to start from the scratch and I am worried about its accuracy as TCS230 is tried & tested & is fairly accurate.

Please provide some suggestion which can help me out from this situation.





Thanks
D

List of 31 messages in thread
TopicAuthorDate
Microcontroller for simutaneous processing.            01/01/70 00:00      
   Analog or digital sensors?            01/01/70 00:00      
   A moments thought            01/01/70 00:00      
      Oh no, that old chestnut again...            01/01/70 00:00      
   what is the problem????            01/01/70 00:00      
      My thought exactly            01/01/70 00:00      
         re microcrocontroller simul. processing            01/01/70 00:00      
            Simple 3 ADCs are nedded            01/01/70 00:00      
               Light to freq-converters            01/01/70 00:00      
      Seems simple enough!            01/01/70 00:00      
         depends            01/01/70 00:00      
   Why simultaneously?            01/01/70 00:00      
      explaination            01/01/70 00:00      
         explain again            01/01/70 00:00      
         Pipeline            01/01/70 00:00      
            addition            01/01/70 00:00      
               Need of Trigger            01/01/70 00:00      
                  black screen            01/01/70 00:00      
                     Response time            01/01/70 00:00      
                        What frequencies?            01/01/70 00:00      
                           once again - one multicolor sensor            01/01/70 00:00      
                           sensor characteristics            01/01/70 00:00      
                              3 sensors or one?            01/01/70 00:00      
                                 3 sensors for one color            01/01/70 00:00      
                                    my preffereces            01/01/70 00:00      
                                       About analog color sensor            01/01/70 00:00      
                                          re:About analog color sensor            01/01/70 00:00      
                                             Digtal sensor            01/01/70 00:00      
                                                re:digital sensor            01/01/70 00:00      
                                          AT89S52            01/01/70 00:00      
                                    some thoughts            01/01/70 00:00      

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