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DIY 2 DOF on a budget

Discussion in 'DIY Motion Simulator Projects' started by Denis Mowberry, Aug 21, 2023.

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  1. Denis Mowberry

    Denis Mowberry Member

    Joined:
    Jun 6, 2023
    Messages:
    116
    Occupation:
    Retired
    Location:
    New Zealand
    Balance:
    63Coins
    Ratings:
    +19 / 0 / -0
    My Motion Simulator:
    3DOF, Arduino, Motion platform
    Help please I have replaced my 12v wiper motors and power supply with 250watt 24v gear motors and new 24v power supply . When I go to SMC3 I have no control over the motors . If I select motor 1 it just runs continuously at full speed motor 2 at half speed. Selecting sine makes the motors turn back and forward but not at all matching the sine wave 3 or 4 full turns in either direction .Just don't know where to start .
    Denis Mowberry, Dec 4, 2023
    #61
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    21,142
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    148,547Coins
    Ratings:
    +10,902 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Are the pots connected and functioning correctly?

    Did you redo the SMC3 setting from scratch:
    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, Dec 4, 2023
    #62
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