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2DOF Arduino Monstermoto build

Discussion in 'DIY Motion Simulator Projects' started by Mitchell, Jun 2, 2015.

  1. Mitchell

    Mitchell Member

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    Hello Guys, My name is Mitchell and i am from the Netherlands.
    I am a production engineer at a company which sells meteo equipment and vision stuff, so i finally got my hands on 2 used wiper motors that where laying around over here. these are 24V 30 NM.. i tested them on 12 V and felt quite strong..

    After a lot of reading on this forum i started to make a prototype.
    I got everything working now with an Arduino Nano clone and a simple L298N motor driver i had laying around.

    The monster moto is on his way from china haha, so for now i can test without load because this motor controller can only handle 4A.

    Check the pictures!
  2. Ads Master

    Ads Master

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  3. Mitchell

    Mitchell Member

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    IMG_6597.JPG IMG_6599.JPG IMG_6595.JPG IMG_6596.JPG

    Also check out the video :
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    Last edited: Jun 2, 2015
  4. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Thanks for the description and photos @Mitchell.

    The setup does not have a pivot so I am interested in what load it is expected to carry. I would also like to understand how the the lever plates attach to the top board and motor shaft, I just can't tell from the angle in the photos.
  5. Mitchell

    Mitchell Member

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    That is correct haha.

    The prototype board and the seat are 2 different things, i still have to get a pivot from somewhere.

    Suggestions ?

    Here you can see the brackets for motor/board connection.

    Attached Files:

  6. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    That clarifies it then, a prototype is a useful thing to do and you gain experience with SimTools. And thanks for adding the video.

    A universal joint is much better than a CV joint for the pivot and you should plan to have it attach as close under the seat as possible. I like many others have used a uni joint from a car tailshaft, some have used the uni joint from a car steering column. Others have made a pivot joint from heim rod ends.

    I look forward to following your project as it develops.
  7. Mitchell

    Mitchell Member

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    Nice! Just came from the car scrap yard!
    I'm happy.

    [​IMG]
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  8. Mitchell

    Mitchell Member

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    [​IMG]

    I will pickup the 2 plates tomorrow so i can start welding :)
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  9. GTHQ_koop

    GTHQ_koop Active Member

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    And a Big mac on the way home :D
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  10. Mitchell

    Mitchell Member

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    Hahaha i was lucky i left that in the car from the day before.

    Funny to see so many dutch people over here by the way.. Where do you live ? i'm from Rotterdam
  11. GTHQ_koop

    GTHQ_koop Active Member

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    Hoofddorp :)

    Have fun building ;)
  12. bruce stephen

    bruce stephen Hammer doesnt fix it, must be electrical

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    very cool cant wait to get mine started
  13. Mitchell

    Mitchell Member

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    Ok, good new.. bad news.

    I put everything together except the monstermoto's, still on their way :(
    Welding went OK, did not do that for 5 years haha but looks solid.
    I tested the motors without a motor controller, just connected it to a 12V car battery and this was the moment i got sad..

    The motors are not strong enough, these are 24V motor which now are getting 12V..
    Please see : http://www.b-hepworth.com/assets/images/Manuals/30Nm.pdf

    So... problem.. i don't want to spend 200+ euro's on new motors, so i ordered 2 of these drivers : https://www.olimex.com/Products/RobotParts/MotorDrivers/BB-VNH3SP30/open-source-hardware

    These should be able to run on a higher voltage then the monstermoto's, just have to keep an eye on the current.
    I think i will fuse them with 20A

    So, the controllers from olimex should be coming in this week.. can't wait to test
    If this isn't enough it's becoming a seat mover probably haha




    IMG_6628.JPG IMG_6633.JPG IMG_6634.JPG IMG_6638.JPG
  14. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Just a thought, you could change the base board position and do a foot mount of the motors like @Archie's rig, that way you would have much more leverage for your full frame sim and a lot less strain on the motors compared to the current design.
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  15. Mitchell

    Mitchell Member

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    Yeah.. good one..

    Will do some tests when i got my motor controllers ;)
  16. Mitchell

    Mitchell Member

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    Nice, just got my controllers.
    Going to do some tests tonight.

    Also made a flexible coupling for my pot's
    I noticed the motors move a a little while operating so a flexible coupling should increase pot life.

    [​IMG]
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  17. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Having a flexible pot coupling will certainly aid pot life.

    I am looking forward to your tests to reduce the strain on the motors.
  18. Mitchell

    Mitchell Member

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    Yes, i will test tonight!
    Just mounted the controllers :)
    ( another productive day at work hahaha )

    Gotta keep em cool :p
    They are small btw!! 30A .. Really

    [​IMG]
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  19. Mitchell

    Mitchell Member

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    OK, after 1 hour of thinkering i finally got my motor controllers working, i had to feed 5V to pin 2 of the controller otherwise it doesn't work. Found it in the datasheet.

    Then i finally tested the full platform, i tested on 16V and 12V and found that 12V is more realistic. When i use the system at 16V the movement are alot more jerky. 12V feels nice but isn't very quick.

    The controllers don't even get hot! i really recommend you guys these MC's!
    Anyway, i already noticed i have alot of configuration/tuning to do.
    Any suggestions to get smooth movements ?

    @ Noorbeast, placing the motors at the foot end really helped alot!


    Will post a video tonight.
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  20. Mitchell

    Mitchell Member

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    After some tuning i like dirt3 best with my sim.
    I think its because there is alot of movement..

    I also play grid2 alot but in this game the movements are a little bit to jerkey i think to feel natural.. Somebody any suggestions ?

    I also tested the rollercoaster sim game, alot of fun! Feels good.



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    Last edited: Jun 14, 2015
  21. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    You would have to post all your settings so members can advise on trying to smooth it out.

    I suspect part of the issue is design, low linear speed plus trying to move a lot of mass, which includes the screen in a full frame design.