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Question SMC3 Code Information and PIN Setup

Discussion in 'DIY Motion Simulator Projects' started by motiondynamics, Oct 9, 2025 at 00:28.

  1. motiondynamics

    motiondynamics Member Gold Contributor

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    Hi everyone, I have a few questions:

    1) I'm using an Arduino UNO R3 and two BLDC drivers to drive two motors, so I'm using SMC3.ino in "Mode 1." The driver only has one PWM input and one EN input. I read the SMC3.ino code and saw that for each motor I can connect either PWM and one ENA (one direction), or a PWM and ENA-ENB (two directions). I'm wondering, is there a difference in efficiency between the two options? That is, if I use a driver with one PWM and one EN, or if I use a driver with one PWM and two ENB, is there a difference in quality, efficiency, and dynamics?

    2) I'd like more details on the PWM provided by Arduino, and the Duty Cycle. Is it a true PWM? Or a signal that resembles PWM?
    I don't know if there's a difference, but I'd like to delve deeper into this because I'm trying to understand how my system will work.

    3) I read the SMC3.ino code and saw that there's a pin called A5 (Motion scaler pot input). I understand that a POT (I assume 10K) can be connected to this pin, but what is it used for? What is it for?

    I look forward to your replies.
    Thanks
    motiondynamics, Oct 9, 2025 at 00:28
    #1
  2. motiondynamics

    motiondynamics Member Gold Contributor

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    If you need more information or if something I've written isn't clear to you, please ask.
    I hope someone can provide the answers.
    motiondynamics, Oct 9, 2025 at 13:48
    #2
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    noorbeast, Oct 9, 2025 at 13:56
    #3
  4. motiondynamics

    motiondynamics Member Gold Contributor

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    I prefer Arduino because I know it very well now.
    I would need to know the three answers; it's very important to me and I don't know them.
    Thanks, Noorbeast, your answers will be invaluable.
    motiondynamics, Oct 9, 2025 at 14:43
    #4
  5. motiondynamics

    motiondynamics Member Gold Contributor

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    Can someone answer my question 3?
    What is pin A5 (scaler pot input) for?
    motiondynamics, Oct 11, 2025 at 00:27
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I appreciate you want to explore a new pathway for your own reasons. That said please be mindful of Community Etiquette: https://www.xsimulator.net/community/faq/community-etiquette.82/

    The first post in the SMC3 thread itself answers your question 3, under the 0.7 Update Notes: https://www.xsimulator.net/communit...3dof-motor-driver-and-windows-utilities.4957/

    Updates Version 0.7

    • Added a POT scaling input that can be used to scale the motion output based on the POT position
    • POT scaling can be setup as one of two modes - Linear or non-linear
    • DO NOT ENABLE POT SCALING UNLESS POT ATTACHED TO ARDUINO
    • AN5 used for POT scaling input
    • The non linear scaling is designed to try and reduce the overall motion but maintain the "smaller" movements as best possible - ie road noise and stuff, but scale back on the huge side to side motion you get in higher power cars.
    [​IMG]
    noorbeast, Oct 11, 2025 at 00:59
    #6
  7. Radioproffi

    Radioproffi Active Member Gold Contributor

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    if you will use 360 deg pot, you can scale work area of crank to 90 degrees.
    Radioproffi, Oct 11, 2025 at 10:35
    #7
  8. motiondynamics

    motiondynamics Member Gold Contributor

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    OK thanks
    motiondynamics, Oct 12, 2025 at 23:47
    #8