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Jerky Hall Effect Pot? (Arduino)

Discussion in 'Electronic and hardware generally' started by Pit, Apr 3, 2015.

  1. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    Hi
    Yesterday I got some new gadgets: the TT Electronics/BI 6127V1A180L.5FS.
    First of all installation is very simple as usual like the standard potentiometer (however no availability of switching polarity).
    While testing SMC3 newly I get sometimes (rarely) jerky impulses - not regular, only sometimes. Mostly directly after changing some parameters of SMC. At the moment I do not know if this is SMC3 (huhu @RufusDufus :) ) or pot related.
    The hall effect pots are new to me if someone knows any reason about that "issue" any help would be kindly appreciated.
    Unbenannt-1.jpg
    • Like Like x 1
    Pit, Apr 3, 2015
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  2. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    hmm Fpid = 1 and Fpwm = 25khz no issues since 1hour...
    @RufusDufus what "happens" with the target line? I am quite sure that this "feature" comes from the Ard and not from the hall effect pots (despite of that the issue has not been shown using the standard pots). NTL I can be wrong...
    Pit, Apr 3, 2015
    #2
  3. Nick Moxley

    Nick Moxley Well-Known Member

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    Not that I know ANYTHING about ARD code or how it works, But maybe the reason its seeing that tiny glitch is the fact halls are That much more sensitive and maybe the standard pot was "dumb" enough not to see it ? I duno, just a guess. Hope you get it figured out :cheers
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    Nick Moxley, Apr 4, 2015
    #3
  4. SeatTime

    SeatTime Well-Known Member

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    While monitoring the setup utility, place a Oscilloscope probe or volt meter (may catch it) on the pots feedback line to see if it is a problem with the pot, or an issue with the card/software. Also check the power to the pot as well, to ensure the supply voltage has no noise on it.
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    SeatTime, Apr 4, 2015
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  5. RufusDufus

    RufusDufus Well-Known Member

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    Hi @Pit, while this behaviour is undesirable it is actually not really a problem at all.

    As the SMC settings are stored in EEPROM on the arduino, I save them automatically I think about 20 seconds? after the last change has been made. Writing a block of data to EEPROM takes some time and "blocks" the normal PID loop temporarily.

    This will not occur during normal operation - only using Windows SMC3 Utility and only shortly after making changes to settings.
    • Informative Informative x 4
    Last edited: Apr 4, 2015
    RufusDufus, Apr 4, 2015
    #5
  6. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    @RufusDufus thank you, luckily no issue. I wonder why this behavior I never noticed before. I am quite sure it never happened :). NTL if this will not occur during normal operation I do not matter.
    Pit, Apr 4, 2015
    #6