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Finally starting 3DOF with integrated G-seat

Discussion in 'DIY Motion Simulator Projects' started by Flux967, May 27, 2023.

  1. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hey guys, particularly @noorbeast , I've finally started on my rig after many months of planning and sourcing components. I've run into some dramas with wiring up the motors (* see photos) . The arduino is communicating with smc3, however ;
    When in smc3 both pots ( 360°hall sensors) are giving feedback but when I add power and try to get some movement by slowly increasing Kp for motor 1 - nothing.
    When I click on motor 2 tab and start the same procedure, motor 1 starts moving but on screen it's showing motor 2( nothing moving )... hope you can see the hardware I'm using from the photos ( sorry for the confusion ) -
    Basically both pots are giving feedback but only 1 motor moving, and it's not the one the smc3 utility says it's moving...

    Attached Files:

    • Like Like x 1
    Last edited: Aug 31, 2023
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
  3. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Yes @noorbeast I used a multi-meter to centre the pots @ 2.5V when lever arm is in neutral position and 90° to tie rod. Both pots showing feedback when turned by hand. Have 180° pots ( the ones you linked) coming as well as a sabertooth 2x32. When I get to my computer I will send you screenshots of smc3 and close- up of wiring _ thanks for your time...
  4. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Also, yes Mode 2
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Please do post pictures of all of the SMC3 settings.

    If you swap the hardware side to side does the problem follow or remain?
  6. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hey guys, well I started this project with the idea of eventually incorporating a g-seat into my 2 ( eventually 3 DOF - spring assisted heave) and after burning a cheap IBT-2, twice, things have proceeded at full speed. Now am upgrading to sabertooth 2x32's x3 and 3 arduinos to control the 6 motors ( 200w, 180 rpm, worm drive, 25:1, 24v, motion dynamics). Question : the range of motion I have with the surge and heave flaps is very limited ( under 45°; ie 20 up and 20 down from centre) and SMC3 can't set max range beyond 255. I've gone from 360° hall sensors to 180° hall sensors as recommended by @noorbeast but still too much range to be able to limit it with smc3. If I get 45° sensors, will that enable me to set a low range of motion - and still get full resolution ? I just thought to use motors instead of rc servos but didn't consider the limited travel... thanks for any help guys...Respect. 20230719_012416.jpg 20230719_012254.jpg

    Attached Files:

  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The lower Hall sensor should give higher resolution, but I have never actually tried a 45 degree hall sensor.
  8. Flux967

    Flux967 New Member

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    My Motion Simulator:
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    Is there any other way to limit the range of motion at all ?
  9. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    I read that the JRK configuration utility enables you to limit range but I'm using 24v motors so think I have to use sabertooth, does that sound right to you ? And thanks for the fast reply @noorbeast !!
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    SMC3 can limit range and so can SimTools.
  11. Flux967

    Flux967 New Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    How can I set the motors up in SMC3 though if it keeps exceeding the limits ( set at 255 ) to then enable me to limit the axis in simtools ?
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Balance:
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    My Motion Simulator:
    3DOF, DC motor, JRK