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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

    Joined:
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    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SimAxe, Arduino, Motion platform, 6DOF
    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