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Thread: Onyx Fire II DXL-bus actuator board

  1. #1

    Onyx Fire II DXL-bus actuator board

    The boards are back from the factory! Of course, I immediately found a firmware bug, so I now have to re-flash a hundred boards. I guess I can pay the kids a quarter per board... and pass the cost on to you all! Ha! :-)

    So, before these boards become available on Amazon (which is soon,) you might want to read the manual to figure out whether you really want one of these or not. Or two. If you want to do that, I'd love to hear your feedback on all my misspellings, poor phrasing, and general authorship ineptitude, all for the betterment of those who come after.

    http://onyxrobots.com/2014/04/29/onyx-fire-ii-manual/

  2. #2
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    Re: Onyx Fire II DXL-bus actuator board

    What you selling them for? And what's the rated amperage??

  3. Re: Onyx Fire II DXL-bus actuator board

    Quote Originally Posted by ArduTank View Post
    And what's the rated amperage??
    Have a look at the documentation

    @jwatte: First thing I noticed on your document: there's no page numbers :/
    It looks very thorough , but I'll read the thing before saying anything else.
    ---
    Personal blog: http://xevel.org
    USB2AX documentation: http://xevelabs.com

  4. #4

    Re: Onyx Fire II DXL-bus actuator board

    The manual (and, soon, Amazon product listing) says 8-18V, 20A peak draw, 5A average draw. The main limiting factor is heat dissipation from the copper on the board, which is in many ways an estimation crap-shoot, so they can quite likely be pushed harder than that in many cases, if you're okay with the warranty being void in case it doesn't work

    I've run the Double Eagle AEG on continuous action from a 3S LiPo with 50% PWM duty cycle, and I believe it can do this indefinitely.

    Amazon Prime price will be $39 including the connection cable. I will sell them at "show special" prices if there's ever another MW competition (ahem...)

  5. #5

    Re: Onyx Fire II DXL-bus actuator board

    Quote Originally Posted by Xevel View Post
    @jwatte: First thing I noticed on your document: there's no page numbers :/
    Oh, duh!
    Fixed :-)
    http://onyxrobots.com/2014/04/29/onyx-fire-ii-manual/

  6. #6

    Re: Onyx Fire II DXL-bus actuator board

    Looks very thorough, nice job!

    One thing you may wish to clarify: On page 4 (in the table) minimum input voltage is specified as 7V, but on page 6 (paragraph 1) it says:
    The Onyx Fire II board can plug right into an existing Dynamixel TTL based serial bus for power and
    communications, as long as the supplied power is between 8V and 18V...
    Since I intend to power my gun with a 7.4 Lipo, the minimum input voltage is somewhat important.

  7. #7

    Re: Onyx Fire II DXL-bus actuator board

    7V is the lower end of what will work. 2S LiPo will work fine as long as they're not discharged below 7V.

    The main problem I found with under-voltage when trying different levels is that the 7805 regulator I'm using has almost 2V drop-out, and when the AEG motor kicks in, it may draw enough current that it lowers the voltage provided to the board, at which point under-voltage protection on the MCU kicks in, and locks everything up. If your batteries are high-C and not depleted, it will likely work fine!

    I want to post a blog post on the onyxrobots.com site with actual measurements and videos about this if I can find the time.

  8. #8
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    Re: Onyx Fire II DXL-bus actuator board

    Looks great! Will the sensors be available as well?

  9. #9

    Re: Onyx Fire II DXL-bus actuator board

    I have a working board from OSH Park, and it conveniently fits into a groove I made in the Shapeways mounting parts. I will solder up a few myself, and make some cables for them using pre-crimped wiring, but I expect some cost-conscious hobbyists might roll their own :-)
    Amazon sales/shipping overhead really hurts. It adds like $10 to anything you want to sell. On the other hand, it then takes care of all ordering/shipping/customer service, so I guess that's worth something. And those who have Prime get free second-day shipping.

  10. #10
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    Re: Onyx Fire II DXL-bus actuator board

    Hmm, ok. Any switch that opens then closes again (or reverse) when fired would work?

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