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HELP!!!!

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Richard Eaton, Nov 9, 2023.

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  1. Richard Eaton

    Richard Eaton Member

    Joined:
    Oct 4, 2023
    Messages:
    87
    Balance:
    235Coins
    Ratings:
    +11 / 1 / -0
    My Motion Simulator:
    2DOF
    Hi,

    I'm in the middle of trying to get the motors running correctly but seem to have an issue I just can't resolve. When connected to SMC3 the motors do not do what they are supposed to. No matter what simulation setting I use they just have a mind of there own...

    Just to add a bit more context, was hoping to add a video but doesn't let me, it is obviously communicating as the motors react in SMC3, they just don't react correctly. Triangle, Square, Since, all it does is go round in circles at the same speed, then stops, then goes again.

    Tested in Simtools and oddly enough the motor does respond when I simulate the axis movement, just very abrupt, so Comms is working.

    Attached Files:

    Last edited: Nov 9, 2023
    Richard Eaton, Nov 9, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,862
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    147,009Coins
    Ratings:
    +10,845 / 53 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    It does not look like PWMmax has been set. This is the setup steps to determine PWMmax, from 9:


    1. Disconnect the motor power supply
    2. Make sure Simtools is not running – we’re not ready for that yet!
    3. Wire up the Arduino (with SMC3 installed) to your H-Bridges and connect to your computer via USB
    4. Run the Windows SMC3 Utility software and make sure it communicates with the Arduino (There is no need to set baud rates, they are not configurable)
    5. Set the Kp, Ki, Kd, PWMmin, PWMmax, PWMrev to 0 for ALL motors (This will make sure the motors don’t move)
    6. Set Clip to 255 (you need to do this first) and Limit to 255 (This will give you plenty of margin if something goes wrong while setting up)
    7. Turn on the power to your motors – nothing should move at this stage!
    8. Set Kp to about 400
    9. Now slowly, increase PWMmax… at some point the motor should start to move. When it does check the “Green” feedback line is moving toward the “Blue” target position.
      • If it is then that motor and feedback is wired correctly - proceed to test other motors.
      • If it is moving away turn off motor power immediately (or quickly reduce PWMmax again). In this case you need to either reverse the wires to the motor being tested –OR– reverse the +5V and GND wires to your feedback pot for the motor being tested (do not do both). Restart the test from the beginning.
    10. Do the above for each motor
    noorbeast, Nov 9, 2023
    #2