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feed back servo — Parallax Forums

feed back servo

pilot0315pilot0315 Posts: 976
edited 2026-02-24 02:20 in Propeller 1

Howdy,
I am finally trying to work with the feedback servo. Looking for some simple code.
I am attempting to use one like a standard servo with limited rotation for say 45 degrees both
directions. I think I saw a few years ago someone who was playing with them but cannot find it.
Just plain simple code hopefully with some documentation comments so I can understand what is being
done.
I have several and would like to use them.
Thank you in advance.
Martin

Comments

  • Christof Eb.Christof Eb. Posts: 1,519

    Hi
    I think there are several "Feedback Sevos". Which exact type do you have?
    One type can just be used as a normal servo but the additional line will give a voltage for the angle that you can measure using adc.

  • pilot0315pilot0315 Posts: 976

    @"Christof Eb."
    All are labeled: feedback servo 360 high speed
    Thanks

  • Christof Eb.Christof Eb. Posts: 1,519

    @pilot0315 said:
    @"Christof Eb."
    All are labeled: feedback servo 360 high speed
    Thanks

    Ok, so these are continuous rotation servos.
    For the application as a standard servo I would buy a standard servo. I don't see the advantage to build a control loop for the angle via P1.

  • JonnyMacJonnyMac Posts: 9,693
    edited 2026-02-26 21:32

    @"Christof Eb." said:
    Ok, so these are continuous rotation servos.

    They are servos set for CR with an extra wire (yellow); on that wire is a pulse that [roughly] provides the position value of the device. I tried. Don't like them. I prefer robotic actuators like Lewan Soul (inexpensive) or Dynamixels. They all run on a single wire bus (open collector, half-duplex serial), and provide a lot more information.

    https://www.amazon.com/dp/B073XY5NT1

    If memory serves me, the LX-1x cannot provide angle when in continuous rotation mode (because it's being used as a motor).

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