Detect fast movement using photodiode


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  1. #1
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    Along the same lines, the data sheet for the part Alain points out has on page 11 another nice way of doing it.
    http://www.google.com/url?sa=t&sourc...SILdHEv5RRcHYQ
    Dave
    Always wear safety glasses while programming.

  2. #2
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    Quote Originally Posted by mackrackit View Post
    Along the same lines, the data sheet for the part Alain points out has on page 11 another nice way of doing it.
    http://www.google.com/url?sa=t&sourc...SILdHEv5RRcHYQ
    Hi, Dave

    Not so nice ...

    as the goal, here, is to take care the detectors are not saturated by light ...

    Alain
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    IF there is the word "Problem" in your question ...
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  3. #3
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    Quote Originally Posted by Acetronics View Post
    Hi, Dave

    Not so nice ...

    as the goal, here, is to take care the detectors are not saturated by light ...

    Alain
    Maybe... but if the OPs part was to pass the two detectors causing the differential ?? then saturation may not be a problem ??

    I am going to try it some day. Just an idea.
    Dave
    Always wear safety glasses while programming.

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    Lightbulb

    Quote Originally Posted by mackrackit View Post
    then saturation may not be a problem ??

    I am going to try it some day. Just an idea.
    Halas !!!

    when saturated ... your detectors won't "see" anything ... both of them !!!

    no differential signal nor ...

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  5. #5
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    Quote Originally Posted by Acetronics View Post
    Halas !!!

    when saturated ... your detectors won't "see" anything ... both of them !!!

    no differential signal nor ...

    Alain
    I am thinking along the lines of both detectors being saturated but spaced maybe a centimeter or so apart. When the piece being detected cast a shadow on one and not the other then the differential. I guess it would only work if the light source was coming from one direction only........Darn, now I am back to square one
    Dave
    Always wear safety glasses while programming.

  6. #6
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    Quote Originally Posted by Acetronics View Post
    Halas !!!

    when saturated ... your detectors won't "see" anything ... both of them !!!

    no differential signal nor ...

    Alain
    From that datesheet, it said that the circuit will not be sensitive to changes in light as the source ages, this means saturate right?

    That means I can't connect IR TX continously?

  7. #7
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    Quote Originally Posted by Pic2008 View Post
    From that datesheet, it said that the circuit will not be sensitive to changes in light as the source ages, this means saturate right?

    That means I can't connect IR TX continously?
    Hi,

    That means aging will modify BOTH sources ... but "saturate" means the sensors ( not the source ...) cannot make any difference in light changes.

    just as if you look straight at the sun ... you can't distinguish anything more in the sky , even in front of you !!! ( the model plane you should fly is a "good" example here ... lol : little chanche for you to keep it in the air ... )

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

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