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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 ;-)
  22. 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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    Project Re: More Mule then Rover?

    Also, could you bolt lifting arms to the side, to give you a longer lever? Put the pivot point at the back of the bot, lift somewhere in the middle, and put the bucket in front, for additional speed...
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    Re: Starting a quad build - A couple questions

    We have a cron job that updates all exeternal dependencies and force-commits them twice a week. Yes, sometimes shit breaks, but it's usually much easier to diagnose on a monday or wednesday morning...
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    Re: 2018 Tucson Mech Brawl

    That sounds awesome! Maybe even enough to make a push for getting a working 'mech back ...
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    Re: Starting a quad build - A couple questions

    That being said, how about a 0.2g carbon steel BB with a hollow-core solenoid accelerator? Can we get it up to 55 m/s?
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    Re: Starting a quad build - A couple questions

    There are only two kinds of systems: Dead systems, and Legacy systems.
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    Project Re: More Mule then Rover?

    Well, who's fault is that?



    Oh, right then.

    What fun would it be without overthinking? :-)

    Else you would just weld a 3/8" steel plate on front at a diagonal, that would plow just fine as...
  33. Re: What university should I choose to develop robotics?

    Most larger colleges have computer science and mechanical engineering departments, both of which would give you useful skills related to robotics. However, some chools have more obvious "robotics"...
  34. Re: Get phidgets data to read in the form of joystick

    It would help if you started with which operating system you're using, and what software is going to read this virtual joystick.

    A Teensy microcontroller can easily be made to "look like" a...
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    Re: need some help on remote PS2

    I assume that you're trying to use a PS/2 controller to control the robot from afar?

    First, the PS/2 controllers are no longer particularly good -- most people will use a Raspberry Pi and a PS/4...
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    Re: First steps for Super Mega Microbot

    You have cold winters in Boston, so that seems like a benefit :-)
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    RoboGames cancelled?

    Apparently, RoboGames is cancelled?

    https://www.reddit.com/r/battlebots/comments/9ogf6k/robogames_2019_canceled_confirmed_on_combat/
  38. Re: Turtlebot 3 parts? Where to get things like special screws?

    http://mcmaster.com/ has all the hardware bits you need.

    For example, 12mm M2.6 socket cap screws are available at $10.48 for 50, plus shipping.
    The main drawback with mcmaster is that they don't...
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    Re: First steps for Super Mega Microbot

    A fast high-powered brushless robot servo with built-in controller would probably be a nice product to sell as a niche market.
    Just sayin' :-)
    Also, without brushes, there's less that can go wrong,...
  40. Question(s) Re: Goal torque on MX28-T protocol 2.0 & benefits of protocol 2 over 1?

    I'm of the impression that the MX servos, with modern firmware, can speak both? The protocols are such that the servo can reliably tell whether you're trying to speak v1 or v2.
    Or do you need to...
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