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PWM noise when changing from PC-Laptop-arduino to PC-arduino

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Peter_the _machinist, Oct 18, 2022.

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  1. Peter_the _machinist

    Peter_the _machinist Member

    Joined:
    Nov 16, 2020
    Messages:
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    Occupation:
    Mechanical Engineer (CAD,CAE)
    Location:
    Poland, Gdańsk
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    358Coins
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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hi, at the beginning of building my 2DOF sim(thread here: https://www.xsimulator.net/communit...wiper-motor-from-mb-actros.15914/#post-228242) I've encountered a problem with too much PWM noise from my PC. At first it was not a problem as I was connecting arduino via my laptop (PC-Laptop - UDP port connection) but now I would like to simplify my setup but noise of the signal between straight PC and arduino is not acceptable:
    upload_2022-10-18_20-26-50.png



    I've cut wires as shown here: https://www.xsimulator.net/community/faq/wiper-motor-mandatory-ground-isolation.25/ but I still have connection between -24V and enclosure of each motor. I don't really understand that and don't know if it's matters for PWM noise or not but I didn't have any problems during using the simulator.

    Things that I've checked:

    - I've powered up arduino with external 12V power supply. Did not change anything,

    - USB shield on my motherboard is connected to ground

    -I've tried various grounding methods:

    -Unshielded USB B to A cable

    -Grounding Shield of arduino USB B connector straight to ground(not VIA PC).

    -My idea was also to power arduino from external source and connect only D+ and D- of USB cable to the PC but it not work as there is no handshake between PC and arduino if there is not Vcc and GND connection.

    My hardware is:
    - Motherboard: MAG Z390 TOMAHAWK (MS-7B18)
    - H-Bridges: BTS7960B
    - Arduino UNO



    Now I run out of ideas of what causing the problem. With my laptop PWM noise i acceptable. Maybe you guys have some advise what to do.
    Last edited: Oct 19, 2022
    Peter_the _machinist, Oct 18, 2022
    #1