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Setting Potentiometer

Discussion in 'New users start here - FAQ' started by kimballfount, Jan 9, 2016.

  1. kimballfount

    kimballfount Member

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    My Motion Simulator:
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    I'm using the SMC3 Arduino sketch to drive one of those cheap 43a chinese hbridges. I manually set the potentiometer to what seems to be the middle position and I then attach it to the back of the drive shaft of the motors gearbox. I would think that the arduino sketch would automatically assume whatever position the drive shaft (pot position) is upon starting would be the middle starting position, but it rotates like 90 degrees upon loading..What's going here? can someone get me going in the right direction? Is there something I can do in simtools to fix this?
    kimballfount, Jan 9, 2016
    #1
  2. speedy

    speedy Well-Known Member

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    My Motion Simulator:
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    you have a feedback reversed direction situation ... It seems like you accidentally switched the wires of the 5V and the ground of the pot ... if not ... try to reverse the motor's wires ...

    Why ? ...
    The pot axle should rotate with the expected motor direction to correct the error to zero if there is a tiny value ... if not well synced ... the error accumulates and increases and the motor reach the cutoff limitation stop point before real damage happens .
    • Agree Agree x 2
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    Last edited: Jan 10, 2016
    speedy, Jan 10, 2016
    #2
  3. kimballfount

    kimballfount Member

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    I have the middle pot wire going to A0 on the arduino, and the 5v wired to the breadboard going into the arduino, the motor wires seem to be wired correctly as well, but it just occurred to me that maybe the gearbox I added to the motor is changing the direction of rotation. It is safe for the device to reverse the wires going to the motor to the hbridge?
    kimballfount, Jan 10, 2016
    #3
  4. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    No , just switch the 5v and ground wires of the pot ... leave the middle wire connected to A0
    Last edited: Jan 10, 2016
    speedy, Jan 10, 2016
    #4
  5. speedy

    speedy Well-Known Member

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    My Motion Simulator:
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    • Useful Useful x 3
    speedy, Jan 10, 2016
    #5