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Green does not go to the center of SMC3

Discussion in 'Ready, set, go - Start your engines' started by Ruslan667, Mar 25, 2026 at 16:47.

  1. Ruslan667

    Ruslan667 New Member

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    My Motion Simulator:
    2DOF, Arduino, Motion platform
    Good afternoon, 2DOF platform on ARDUINO UNO, the green line does not come to the center, I turn the centiometers, it jumps either up or down, I’ve already tried a lot. The drivers work because the platform worked previously, I changed the driver to a new one and stopped working, both sides
    Last edited by a moderator: Mar 25, 2026 at 23:05
    Ruslan667, Mar 25, 2026 at 16:47
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    My guess would be that the pot is not properly centered or there is something fundamentally wrong with the hardware.

    Please detail the drivers used and post pictures of your SMC3 settings.
    noorbeast, Mar 25, 2026 at 23:09
    #2
  3. Ruslan667

    Ruslan667 New Member

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    My Motion Simulator:
    2DOF, Arduino, Motion platform
    The first photo, with the graph, it goes in waves when you don’t touch it, but when you start to center it, it jumps to the blue one either, in the second photo there is the platform itself, and the driver

    Attached Files:

    Last edited by a moderator: Mar 26, 2026 at 09:43
    Ruslan667, Mar 26, 2026 at 07:49
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    In SMC3 it does not look like the pot is centered when the rig is level.

    Try disconnecting power to the motor while the rig is level, disconnect the pot from the motor and while watching SMC3 rotate the pot until it is centered, while the rig is level, then carefully reconnect the pot to the moor shaft while centered.

    As an aside be aware the IBT2s need cooling and if using 24v others members have reported quality issues, even with brand new units, with dropping the voltage a bit being reported to help longevity.
    noorbeast, Mar 26, 2026 at 09:48
    #4
  5. Ruslan667

    Ruslan667 New Member

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    My Motion Simulator:
    2DOF, Arduino, Motion platform
    Hello everyone,
    I'm having a problem setting up a 2DOF platform. The feedback signals (green lines) in the SMC3 utilities are mirrored on each other.
    When I rotate only one potentiometer, the green lines on both graphs (motor 1 and motor 2) move at the same time.
    Here's what I checked/observed:

    Mechanical isolation: The connections are loose, so the potentiometers are disconnected from the motors and can be freely rotated by hand.
    Signal duplication: Even if I completely disconnect one potentiometer from the Arduino board, the software will still show the green line for that channel moving and mirroring the signal from the connected potentiometer.
    Hardware: I am using an Arduino Due controller.
    Calibration: Even with the potentiometer disabled, I can't get the green line to stay centered; it simply follows another channel.

    Is this a known issue with floating inputs on the Arduino Due, is it related to ground (GND) or is it a feature of the SMC3 sketch configuration? I would greatly appreciate any advice on signal localization.
    Last edited by a moderator: Mar 26, 2026 at 12:51
    Ruslan667, Mar 26, 2026 at 11:27
    #5