1. Do not share user accounts! Any account that is shared by another person will be blocked and closed. This means: we will close not only the account that is shared, but also the main account of the user who uses another person's account. We have the ability to detect account sharing, so please do not try to cheat the system. This action will take place on 04/18/2023. Read all forum rules.
    Dismiss Notice
  2. For downloading SimTools plugins you need a Download Package. Get it with virtual coins that you receive for forum activity or Buy Download Package - We have a zero Spam tolerance so read our forum rules first.

    Buy Now a Download Plan!
  3. Do not try to cheat our system and do not post an unnecessary amount of useless posts only to earn credits here. We have a zero spam tolerance policy and this will cause a ban of your user account. Otherwise we wish you a pleasant stay here! Read the forum rules
  4. We have a few rules which you need to read and accept before posting anything here! Following these rules will keep the forum clean and your stay pleasant. Do not follow these rules can lead to permanent exclusion from this website: Read the forum rules.
    Are you a company? Read our company rules
Shared accounts will be removed Plugin Downloads Zero spam policy Forum Rules

SMC3 noise ? New computer ?

Discussion in 'DIY Motion Simulator Projects' started by Gadget999, Mar 25, 2021.

  1. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    I have just swapped my sim over to a new computer

    the actuators seem to be a bit lively and dont sit still

    opening up the SMC3 util program shows a noisy potentiometer trace

    the pots are hall effect multi turn

    the problem can be shown in the attached image


    so the only new thing is the computer - Am I right to assume this noise is from the PC power supply going into the usb ?

    has anyone had a similar problem and how did you cure it ?

    (I have tried an isoltated USB hub and the problem still seems to be there)

    Attached Files:

    Gadget999, Mar 25, 2021
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,539
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    145,052Coins
    Ratings:
    +10,776 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    While possible I am more inclined to think some cables got moved and may be the source of interference.

    So check cable management and pot connections and consider clip on ferrite magnets, if you are not already using them, and see if any of that makes a difference.
    noorbeast, Mar 25, 2021
    #2
  3. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    Hi Noorbeast - you were right

    the computer was plugged in to the same power cable as before, but I was using an extension lead with a usb hard drive caddy, the power supply was not earthed and was giving off a lot of noise - unplugged the coiled up extension and the usb/drive/power supply -- problem gone :)

    motion back to being silky smooth
    • Winner Winner x 1
    Gadget999, Mar 25, 2021
    #3
  4. Dezixi

    Dezixi New Member

    Joined:
    Apr 24, 2022
    Messages:
    1
    Balance:
    16Coins
    Ratings:
    +0 / 0 / -0
    My Motion Simulator:
    Motion platform
    When the actuators seem a little lively , it's already bad, try to avoid it
    Dezixi, Apr 24, 2022
    #4
  5. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    What other devices are using usb ?
    Gadget999, Apr 24, 2022
    #5
  6. Kernauti

    Kernauti New Member

    Joined:
    Apr 25, 2022
    Messages:
    1
    Balance:
    23Coins
    Ratings:
    +2 / 0 / -0
    My Motion Simulator:
    2DOF
    Thank you! I didn't immediately understand that it was just a cable and began to listen to the power supply.
    • Winner Winner x 1
    Kernauti, Apr 25, 2022
    #6
  7. absyfadhel1

    absyfadhel1 Member

    Joined:
    Oct 19, 2017
    Messages:
    324
    Location:
    bahrain
    Balance:
    422Coins
    Ratings:
    +30 / 0 / -0
    My Motion Simulator:
    2DOF, Arduino
    How exactly you solve it? i have the same problem but i dont have usb hub so what you suggest?
    absyfadhel1, Jul 13, 2022
    #7
  8. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    what usb devices are plugged into the pc - unplug them one at a time and use usb 2.0

    are you using a power supply or batteries to power your motors ?
    Gadget999, Jul 13, 2022
    #8
  9. absyfadhel1

    absyfadhel1 Member

    Joined:
    Oct 19, 2017
    Messages:
    324
    Location:
    bahrain
    Balance:
    422Coins
    Ratings:
    +30 / 0 / -0
    My Motion Simulator:
    2DOF, Arduino
    power supply, when i try to connect my rig to laptop its smooth but in my gaming pc there is alot of stutter in the green line , i tried to remove all usb from the computer and use the motor usb only but still same, i'm thinking now in grounding the pc case (cable from powersupply screw to wall), you think its good sulotion or i should buy Pci to usb like this one

    XM-UB3204-v3.jpg
    absyfadhel1, Jul 13, 2022
    #9
  10. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    unplug everything usb except the smc3 - are you in a usb 2.0 port ?

    try a different usb cable
    Gadget999, Jul 13, 2022
    #10
  11. absyfadhel1

    absyfadhel1 Member

    Joined:
    Oct 19, 2017
    Messages:
    324
    Location:
    bahrain
    Balance:
    422Coins
    Ratings:
    +30 / 0 / -0
    My Motion Simulator:
    2DOF, Arduino
    Thanks for help,
    but i tried everything nothing fix, i will try to ground pc and see what happend if not helped also i will but Pci to usb
    absyfadhel1, Jul 13, 2022
    #11