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    Luis Chaman
    Jun 06, 2020

    After calibrating it, the degrees advance on the screen, without the arm moving.

    in Questions

    Hello, Thank you very much for everything Chris, I find it an amazing project.

    I am connecting the AR3 in an aluminum version, I carried out the calibration tests and it ends successfully, after a while of manipulating the arm, on the screen the position of J5 begins to advance until it exceeds the maximum values, without the arm physically move, after that I can no longer control the arm as it thinks it is out of calibration. What could be happening?

    before this happens the motors work well in both directions and as I wrote earlier it calibrates well.

    I'll go over the diagram again.

    Thank you very much for reading and any comments are welcome.

    6 comments
    Chris Annin
    Jun 06, 2020

    That is very interesting I have not seen that issue before. I think it could be an issue with the J5 encoder, possibly a grounding or signal issue. I would have a look at the wiring on that but I would suspect mostly a grounding issue.

    Felix
    Jun 07, 2020

    Hi Luis,


    I had a similar issue with some of my AR3 encoders at first and for me it was some kind of EMC interference that triggered the values. I grounded all the shielding of the encoder cables and since then the values from the encoders are perfectly stable.

    Luis Chaman
    Jun 13, 2020

    Thank you all very much, I was reviewing the wiring, and corrected a couple of encoder cables, between j2 and j3, probe and it was the same, pass the shield to ground and it was the same. I have to recalibrate automatically for it to update, but every time I update one or a couple of encoders the value starts to rise, the encoder itself is not constant, it varies. if I disconnect it to increase the numerical value. previously I removed a noise in motor 5 since the cables were interchanged, it was removed; Although the 4 motor is still making a little noise, I already checked the wiring and it's fine. although I believe it does not affect the main problem discussed here, since even if you disconnect it, the increase in values continues. I'll keep checking. Any comment is welcome. If I find something, feedback. Thank you.

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    xtblue
    Apr 27, 2021

    I finished my AR3 just a few weeks ago and I am battling this same issue.

    Does anyone know yet what causes this?

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    Brian Seal
    Dec 08, 2021

    I too, am facing this issue... Its really frustrating. I grounded the braided encoder wires from the start but am still seeing this issue. Does anyone have any updates or ideas to this issue?

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    joop.flack@gmx.de
    Jan 05

    I had the same problem with j4/j5/j6 which are all on the same rj45 connector and in the end it was a faulty rj45 cable

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    6 comments