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    Discussion Re: controlling dynamixel mx-64at

    If you want to use multiple batteries, then you need to create custom Dynamixel hub boards.
    The board would pass the serial signal/s and the ground signal through, but would disconnect the 12V...
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    Re: RoboGames cancelled?

    I hate Maker Faire because it's so crowded and noisy, but if there's a dedicated spot for Mech Warfare, it's a very convenient drive or train ride for me, so I could totally do that. Assuming I could...
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    Question(s) Re: controlling dynamixel mx-64at

    A pretty easy way to control these servos is to use the OpenCM 9.04 board, and the Robotis library that has built-in functions for sending commands to the servos.

    A single 11.1V LiPo battery will...
  4. Re: dc motor, monster moto shield VNH2SP30 ,arduino uno and matlab

    Are you running the correct firmware on the Arduino?
    Can you make a LED blink using the Matlab code? (The LED lives on pin 13 IIRC)
    If you hook up an oscilloscope on the serial RX/TX lines on the...
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    Re: First steps for Super Mega Microbot

    That is freakin' scary!
  6. Thread: New Member

    by jwatte
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    News/Announcement Re: New Member

    That looks awesome! And also somewhat dangerous if it suddenly hits you...



    As long as you run them on different wires and different serial ports for the host controller, that shouldn't be a...
  7. Question(s) Re: Hex M2 Nut Not fitting into Dynamixel AX-18A Servo

    The AX-12 and AX-18 use the same physical size/enclosure -- the point is that you can interchange them!

    The M2 nuts should require firm but not hammering pressure to go in. It should go in with a...
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    Project Re: More Mule then Rover?

    From what I've learned from hand-pulled snow scoops, you may want to support up to 20 degrees backwards tilt to keep the scooped snow on the bucket. It's annoying when you try to lift things, but...
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    Project Re: More Mule then Rover?

    Looks quite robust! Now all you need is another foot of snow ;-)
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    Re: dynamixel issue demagnetize/magnetize?

    Most VFDs these days have hook-ups for brake resistors, which end up taking the load of overvoltage.
    Many battery-driven motor controllers have a diode path back to the battery for "regenerative...
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    Re: dynamixel issue demagnetize/magnetize?

    Are you using the Robotis SMPS ?

    Various power supplies may be poorly regulated to spikes in load, and swing the output voltage wildly; especially when movement stops and the motor dumps load back...
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    Re: dynamixel issue demagnetize/magnetize?

    They don't like being stalled for long times. Or, if you use 4S, for any perceptible time ... 3S is safer.
    Also, they don't like reverse polarity power. Just sayin' :-)

    Finally, you can shear the...
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    Re: dynamixel issue demagnetize/magnetize?

    This happened to me too. The windings in the servo overheated, and the motor now has a bit of stickyness because of it. The only fix is to send it to Robotis for motor replacement. The overall cost...
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    Project Re: More Mule then Rover?

    That looks awesome!

    You probably should do both current limiting and safety limit switches.
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    Re: PhantomX + CM9.04 but no Xbee!

    Also, if you have two separate gaits stored as snapshots, you can still interpolate between them as long as you can index by "logical time" (as in, "how far into the full cycle are you?")

    That...
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    Re: PhantomX + CM9.04 but no Xbee!

    It's code. Anything CAN be done. How much work it it? I don't use Phoenix, so I have no idea.

    In my own system, I have a number of input variables (amount of turn, amount of forward speed, amount...
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    Re: PhantomX + CM9.04 but no Xbee!

    I use iBus, but other than that, yes, it's totally possible, assuming that you can live with the controls that can generate that format.
    (I e, sometimes custom controllers, or game controller...
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    Project Re: More Mule then Rover?

    seeing where you go is important :-)
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    Re: 2018 Robogames Mech Target Plates/Transponder

    Thanks for the info!
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    Re: First steps for Super Mega Microbot

    Do you find a big difference between the "Onyx" black nylon versus Shapeways "Strong Flexible" in black? They're both nylon ...

    Also, for SMMB I might be able to make some parts in aluminum for...
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    Re: First steps for Super Mega Microbot

    That's super awesome!

    (Do you have access to internal company machining resources for making parts?)
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    Project Re: More Mule then Rover?

    Free material is best material!
    (Or, as I prefer to think of it: Made of pure scrapbinium!)
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    Re: Giant Sized Humanoid robots!

    The method looks so awesome!
    What does it feel like when that cockpit sways back and forth?
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    Project Re: More Mule then Rover?

    "only"
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    Project Re: More Mule then Rover?

    Oh, yeah, some relays have a limited duty cycle -- for starter motors that aren't intended to run all the time.
    In the end, MOSFETs almost always win for longevity! And that's where the Sabretooths...
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    Project Re: More Mule then Rover?

    SoftwareSerial is always intermittent at speeds above 9600 bps :-(
    The interrupts used to drive functions such as millis() end up causing the conflict even if you don't do anything else.

    For what...
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    Project Re: More Mule then Rover?

    If the motor controller isn't running, then the current during close is negligible (unless it has really big/low-ESR capacitors.)
    You can also pre-charge with a 10 kOhm resistor in parallel, but...
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    Project Re: More Mule then Rover?

    Cost saving tip: You can drive the coils of the 80A relays with a simple MOSFET from the Arduino!

    The BS170 turns on at about 2V gate voltage, and is good up to 500 mA coil current depending on...
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    Re: 2018 Robogames Mech Target Plates/Transponder

    In the best of worlds, that pin wouldn't use the hundreds-of-milliseconds pulse protocol, but instead send a UART byte at 115,200 bps or something like that ... A value something like:


    (0x80 if...
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    Project Re: More Mule then Rover?

    Sounds like a simple way to get things going with what you have in the parts bin :-)

    Although I wonder if you couldn't just drive it all with relays, cheaper than the motor controller, if you...
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    Project Re: More Mule then Rover?

    Did you cut that circular pocket on a manual mill without a rotary table? Or are there stepper motors somwhere I'm not seeing them? :-D
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    Re: 2018 Robogames Mech Target Plates/Transponder

    Is there some kind of interactivity between the scoring system and the 'mech, such as telling the 'mech where it's hit and what the score is?
    Or, barring that, is the network protocol going to be...
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    Project Re: More Mule then Rover?

    Ah, yes, and you even said so in your post!
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    Project Re: More Mule then Rover?

    Are those Teensy 2 boards on the sides? Or some Arduino Leonardo clones, perhaps?
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    Project Re: More Mule then Rover?

    Ooh, those look like linear guides! That is, indeed, overkill ;-)
  36. Thread: Delta Robot

    by jwatte
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    Question(s) Re: Delta Robot

    If you're in the final year of a university education, you should be able to do sufficient Google searches to figure this out.

    Btw: I know of no industrial robot that does pick-and-place using a...
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    Re: Using Pincher with MatLab

    Install VMWare Fusion?
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    Project Re: More Mule then Rover?

    My neighbors don't worry about their lawn crews using weed trimmers at 6am, soo ....
    Buy a shotgun, ignore the neighbors? :-D
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    Re: Starting a quad build - A couple questions

    View M.2 more as a connector (from which you run wiring) than the full card ...

    Anyway, yeah, the Saleae logic analyzers, which I love, are made from the Cypress USB 3 FPGAs, so they seem legit.
    ...
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    Re: Starting a quad build - A couple questions

    The Cypress stuff is what Saleae uses for their logic analyzer product, so that ought to work.

    If not, make it PCI-Express and call it good :-)

    (You could perhaps squeeze it into a M.2 form...
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