Parallax has a new high-speed, continuous rotation servo with feedback!

Product link https://www.parallax.com/product/900-00360

Video of the servo in action:



Ken Gracey

Comments

  • 26 Comments sorted by Date Added Votes
  • Great product Ken! Been waiting for the announcement.
    Infernal Machine
  • Wow, Ken! That's really neat! Finally, a solution to encoder/wheel alignment and calibration issues. This will be a godsend to school robotics classes! Will those servos be standard on the ActivityBot going forward?

    -Phil
    “Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery
  • @Phil. Yes, sir. I suppose we've now created a countdown timer that obsoletes our current ActivityBot inventory.
    @Publison. I'll send some of these to you guys in the coming days, so you can check them out.

    Ken Gracey
  • Looking good, Ken!

    Maybe you could do a second version of this with your narration. Some folks might not see the benefit of this type of servo without more explanation. Obviously, as a closed-loop servo this will be very handy in robotics, but it's application goes way beyond that in science class. Game changer, I'd say, especially at $19.95.
  • This is awesome! Perfect for small robots. Maybe it could shave some off your build cost on the Activitybot kits if you used these instead of the regular high speed servos and encoder kit.
  • Do you plan any Spin/PASM support?
    Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.
    Cool, CA, USA 95614
  • DrPop wrote: »
    This is awesome! Perfect for small robots. Maybe it could shave some off your build cost on the Activitybot kits if you used these instead of the regular high speed servos and encoder kit.

    The difference in BOM costs for an ActivityBot with these servos will be [drum roll please. . . . . . .] $0.01 per kit.

    But the real costs are in over a year of R&D, library support, kit revisions, and so on. The businessman inside of me wants to amortize these across our annual ActivityBot sales, which could double the cost of the ActivityBot. :)

    Ken Gracey

  • No @Ken,

    the business men in you should say - let this season run the existing ones, redo the documentation/Example PROPERLY, and have a bright next year with upgrading.

    And it is also positive for all the schools, after upgrading they have nice servos left for gripper-kits, moving Pings, whatever!

    This is a cool product. Right on the point and with a good price.

    Enjoy!

    Mike
    I am just another Code Monkey.

    A determined coder can write COBOL programs in any language. -- Author unknown.

    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this post are to be interpreted as described in RFC 2119.
  • This servo looks really great! I expected a higher price, but $19.99 seems very good to me.

    I always wanted to put a Prop chip inside a servo to give it better control, but maybe this is better...
    Prop Info and Apps: http://www.rayslogic.com/
  • This is pretty cool.

    If you add torque feedback, you could get into the micro market of torque controlled assembly screw drivers.
  • Do you plan any Spin/PASM support?

    We will release a C library and Blockly support. From that, I'm hoping that our forum members can help us out with the Spin/PASM code examples. The most volume usage of this product will come in the ActivityBot, which uses the C library.

    Ken Gracey

  • While we're creating massive work for you :smile: , if there is any way you would ever consider replacing the standard servos in the Arduino bot kit with these, it would fix the only thing I didn't care for about that purchase. Compared to the Activitybot kits I have, the standard servo and lack of encoders makes the Arduino bot kit inferior in practice.
    These servos would make that kit just about perfect. I do realize it would raise the price somewhat.
  • Very cool!

    Position/velocity/torque feedback education is absolutely essential for understanding how real-world robots and machine-tools (CNC) work.
    PropBASIC ROCKS!
  • Very nice! I'm not working on a robot project at this time but these look to solve several issues I've had in the past with my feeble attempts at positional encoding.

    (Dreaming) it would be nice if someone came out with a CRS where you could specify a specific rotational speed and direction (6 rpm, forward).

    BTW, the page for the product guide currently links to a zip file with C source code instead.
    Tulsa, OK

    My OBEX objects:
    AGEL: Another Google Earth Logger
    DHT11 Sensor

    I didn't do it... and I promise not to do it again!
  • wmosscrop wrote: »
    BTW, the page for the product guide currently links to a zip file with C source code instead.

    I seen that too, didn't unzip to see the content.

    Fantastic product idea, have to build a new robot around them.
  • DrPop wrote: »
    While we're creating massive work for you :smile: , if there is any way you would ever consider replacing the standard servos in the Arduino bot kit with these, it would fix the only thing I didn't care for about that purchase. Compared to the Activitybot kits I have, the standard servo and lack of encoders makes the Arduino bot kit inferior in practice.
    These servos would make that kit just about perfect. I do realize it would raise the price somewhat.

    Couldn't you just add encoders to the bot?

    https://www.parallax.com/product/32501


    Infernal Machine
  • DrPopDrPop Posts: 69
    edited September 7 Vote Up0Vote Down
    Publison wrote: »

    Couldn't you just add encoders to the bot?

    https://www.parallax.com/product/32501


    Yes, that's one solution. However, the point was more about what comes in the $179 kit - because everything else about the kit is great.
    EDIT: I didn't mean to throw this thread off track, just wanted to mention these servos would be a perfect upgrade for the Arduino Bot kit.
  • wmosscrop wrote: »

    BTW, the page for the product guide currently links to a zip file with C source code instead.

    Both downloads point to the same file. I unzipped then to check.

    Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.
    Cool, CA, USA 95614
  • The Product Guide download page has been updated to point to the correct file.
  • The downloads will be fixed this morning.

    As for the Shield-Bot for Arduino, we'd like to achieve the goal DrPop suggested. As you all know, it's not a matter of putting the servos in the box. We need to write the libraries, test them out, revise the documentation, etc. These products go into courses where teachers are often very new to the subject, timid about their knowledge, etc. Everything must work entirely correctly, without any problems. Getting there takes time.

    In the meantime, we can all watch a bunch of one-hit-wonder "STEM learning toys" pop up on KickStarter, delivering promises with an educational hook that some teachers will take. But if they wait and get Parallax they'll always be happy in the long run.

    Ken Gracey
  • This is an awesome product and priced to sell...
  • Wish it was at Mouser already... Just happen to be doing order...
    Prop Info and Apps: http://www.rayslogic.com/
  • That is good news.
    Larry

    If the grass is greener on the other side...it's time to water your lawn.
  • In the product guide, there are a couple of references to 259 degrees:

    "Reason being, if the high and low pulses are sampled before and after a moving servo crosses the 259 to
    0 degree boundary"

    "This calculation returns 0 to 259 depending on the measured duty cycle."

    Shouldn't these be 359 (0 to 359 degrees)?
    Tulsa, OK

    My OBEX objects:
    AGEL: Another Google Earth Logger
    DHT11 Sensor

    I didn't do it... and I promise not to do it again!
  • wmosscrop wrote: »
    In the product guide, there are a couple of references to 259 degrees:

    "Reason being, if the high and low pulses are sampled before and after a moving servo crosses the 259 to
    0 degree boundary"

    "This calculation returns 0 to 259 depending on the measured duty cycle."

    Shouldn't these be 359 (0 to 359 degrees)?

    Fixed! Thanks!

    We will be frequently updating the guide and adding more resources over the next month - there is so much one can do with this servo that it will take a while to document all the possibilities. If you find any more typos or have other questions, just email editor@parallax.com directly so I don't miss it.

  • wmosscrop wrote: »
    (Dreaming) it would be nice if someone came out with a CRS where you could specify a specific rotational speed and direction (6 rpm, forward).

    Pure coincidence that the minimum RPM I can get is ~6 RPM, but that stalls occasionally.

    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
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