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ISSUE: noise coming from the VNH5019 on the M1/M2PWM line

Discussion in 'Motor actuators and drivers' started by Pit, Aug 25, 2015.

  1. Pit

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

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    Hello

    EDIT, c/p the text from a posting on pololu forum

    Hello

    I am using a Dual VNH5019 motor driver shield with an Arduino UNO R3 where the Arduino is powered separately by the Notebook (jumper is off)

    The issue: I get some big noise on the pot feedback line ONLY coming from the M1/M2PWM lines (VNH5019) to the Arduino and ONLY if the PSUs (24V) are on.

    Second there is something which makes me stunning: the mouse pad of my notebook does not respond respectively there is a big lag on it, ONLY if the PWM line is shared to the Ard and the PSUs are powered on.

    To be clear: no 5V line is connected from the VNH to the Ard, ONLY the PWM line is shared.

    Electronic gurus, any help is much appreciated :)
    Last edited: Aug 25, 2015
    Pit, Aug 25, 2015
    #1
  2. BlazinH

    BlazinH Well-Known Member

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    The Ard and the VNH need to share a common ground also. Connect a wire between the Ard's gnd or its power supply's gnd and the VNH's gnd on the control side of the board, not the motor side gnd.
    BlazinH, Aug 25, 2015
    #2
  3. Pit

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

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    Sorry for the lack of information, I forgot to say connecting the GND from whatever side to the Ard does not change anything. Anyway thank you.
    Pit, Aug 25, 2015
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  4. Pit

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

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    :mad: - nothing of that all - the notebook is the source of the noise!! There have been never any issues, this is new and has nothing to do with the VNH, it is a coincidence that I meant that the VNHs have some issues. Shit...

    PS: it has something to do with the power saving mode of the notebook. Using the charger the noise is significantly lower but not eliminated. But now I know where to looking for.
    • Informative Informative x 1
    Last edited: Aug 25, 2015
    Pit, Aug 25, 2015
    #4
  5. RufusDufus

    RufusDufus Well-Known Member

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    Hi Pit, I know you have tracked the problem to the laptop PSU but can I ask what you have done with the VNH5019 M1EN/DIAG and M2EN/DIAG pins? Are they connected or not?

    The datasheet for the chip says they need to be connected to an external pullup. There is an external pullup on the pololu board schematic but if you don't have the 5V connected from the Arduino I don't see how it is actually pulled up to anything?

    Also I note your pots have long wires on them. Make sure in the final build they are twisted together. What value pots are you using? I would suggest using something around 5K with those long wires.
    RufusDufus, Aug 26, 2015
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  6. Pit

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

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    Hi Rufusdufus they are not connected but all other needed pins are - should I connect them?
    The 5V line was off because of testing purposes only.
    10k - the table seems to be reactive when testing the smc3 motion output meanwhile the feedback line was lagging behind.
    Pit, Aug 26, 2015
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  7. BlazinH

    BlazinH Well-Known Member

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    I don’t know if this the cause of your problem but according to Pololu the minimum connections require Vdd on the driver be connected to the Ard’s 5v for the pull up resistors and also the control source and the motor driver must share a common ground. https://www.pololu.com/product/1451
    BlazinH, Aug 26, 2015
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  8. Pit

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

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    There is some misunderstanding about my explanations...

    I connected the Ard and the VNH this way:
    0J3755.600.jpg

    Then I noticed when the PSUs have been powered on the noise on the feedback line.

    At least I localized the noise coming from the PWM lines only, that said even if only the PWM line is connected, the noise persists. This was my conclusion that the PWM is the source of the noise, but it was not due the notebook issue.

    Definitely it works now.
    Pit, Aug 26, 2015
    #8
  9. SeatTime

    SeatTime Well-Known Member

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    Fi, I wired mine basically the same as a MM and it works perfectly. As explained in another thread used a capacitor on the feedback line to remove noise.
    SeatTime, Aug 26, 2015
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  10. Pit

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

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    I dimly remember it, on the pot you wired + and - together? Which capacitor did you use?
    Pit, Aug 26, 2015
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  11. SeatTime

    SeatTime Well-Known Member

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    Tantalum - positive on the feedback line, negative to feedback ground, size? It was from my junk box. I'm OS cannot check.
    • Informative Informative x 1
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    SeatTime, Aug 26, 2015
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  12. Pit

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

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    no probs I can test various capacitors...thank you for the hint.
    Pit, Aug 26, 2015
    #12