Search:

Type: Posts; User: jwatte; Keyword(s):

Page 1 of 13 1 2 3 4

Search: Search took 0.02 seconds.

  1. Thread: Temi

    by jwatte
    Replies
    2
    Views
    103

    Re: Temi

    What do you mean by "personnel teleportation device" ? With two 50W motors, I don't think a human being is supposed to ride on it?
    Maybe this is a competitor to telepresence robots like "double"...
  2. Question(s) Re: DYNAMIXEL MX-28 Velocity Mode is Not Working Properly

    How long does it keep moving slowly? Forever?

    Which value do you write to the goal velocity register to write a "zero" target? If you bump it up or down by one, does it stop the motor?
  3. Re: Question about a particular omnidirectional robot design

    I've heard it called "omnidirectional steering" but I don't know if there's a more accepted name in practice.
    Given that these aren't particularly common in industry, I wouldn't be surprised if...
  4. Question(s) Re: Can't connect to Dynamixel MX-106T servo on dynamanager

    Do you have a USB2Dynamixel or perhaps a U2D2?
    Then you might be able to use the Dynamixel Wizard to see if you can scan to find the servo.
    You can also attempt to update the firmware of the servo....
  5. Thread: mjbots quad A0

    by jwatte
    Replies
    3
    Views
    524

    Re: mjbots quad A0

    When you crank up the speed, it looks quite scary!
    Very nice video, too -- you're having so much fun.
  6. Replies
    4
    Views
    1,206

    Question(s) Re: 4 Dof Hexapod Torque calculations

    The link posted the first time, but all I see is a unit converter, nothing that analyzes the weight distribution of a supported legged robot.
  7. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Now to start the engine only when battery voltage falls below X, and then stop it when voltage reaches full charge again :-)
  8. Replies
    27
    Views
    4,909

    Re: Maker Faire 2019 Mech Warfare

    Nice!
  9. Re: with problem on Arduino IDE

    I think the problem is in ROS code, not Dynamixel code. USBSerial is not (necessarily) a HardwareSerial.
    They might, for example, want to use Stream instead?
    This is the same in Teensy 3/4, btw:...
  10. Re: with problem on Arduino IDE

    It looks like the ROS library is hard-coded to expect a "real" serial port, which is reasonable on old-school Arduinos, but not later ones like the Leonardo (or the Teensy 3, or the OpenCM 9.04)
    The...
  11. Replies
    27
    Views
    4,909

    Re: Maker Faire 2019 Mech Warfare

    "The BBs go in here" :-)

    The one extra thing I'd wish for these movies is a quick show of which mech has what name somewhere in the beginning. Would make it easier to remember for those of us who...
  12. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Yeah, I've noticed that grass is a motor killer.
  13. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    I'd love to see that steering setup built :-)
  14. Question(s) Re: Dynamixel XM430-W210-T bricked after firmware update

    Yeah, I think the USB2Dynamixel doens't even work anymore with the new software. I had servos that would not update correctly, but when I sent them in, they claimed they updated fine.
  15. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    I imagine you could use a diode and a 12V DC converter to keep the 12V battery topped off while the motors aren't stalling out? Or do you think you'll just have < 15V on the 24V rail most of the...
  16. Replies
    3
    Views
    1,065

    Question(s) Re: OpenCM sketch upload problems on virtualbox

    Virtual machines and USB devices are a right pain, because of the way that the hardware and host and guest OS have to cooperate to route the USB device to the virtual machine. VMWare has a custom...
  17. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    I would look into a DC/DC converter that outputs 12V 10A from the 24V rail instead. A little bit of electronics is generally lighter and more robust than anything mechanical ...
  18. Question(s) Re: Dynamixel XM430-W210-T bricked after firmware update

    Flipping the switch to cut power may not work right if it also disconnects the board from the PC.
    I would recommend literally un-plugging and re-plugging the wire into the servo when the wizards...
  19. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Nice!

    Also, looks like just the right size to run that 2.4 kW generator. And at $100, it sounds like you got a good deal!
  20. Replies
    4
    Views
    1,195

    Question(s) Re: Using Dynamixel AX-12 A

    After the servos fail, can you move them by manually moving the arm? Does the red LED blink?
    It's quite possible the servos detect overheating and shut down.
    You should be able to read back the...
  21. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Love it :-)
  22. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Better watch out! If you're not careful, you'll end up with a robotic farm to sustain you through the coming climate apocalypse, and then where would you be?
  23. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Good thing this is not your lawn mower robot :-)
  24. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Using a bigger controller is not a problem in itself -- it just gives you more margin for error. The only reason to use a smaller controller is if space or dollars are a constraint. FWIW, I've...
  25. Replies
    278
    Views
    99,369

    Project Re: More Mule then Rover?

    Very nice!

    But will it have four-wheel independent steering? :-D
  26. Replies
    4
    Views
    1,195

    Question(s) Re: Using Dynamixel AX-12 A

    Yes, you need to configure their ID so they match the ID of the current servos in the arm.

    Btw: You should be able to use Dynamixel Wizard and hook up just one servo at a time. Scan the bus to...
  27. Replies
    3
    Views
    1,068

    Re: 2 USB Connections on Teensy 3.5 or LC

    Yeah, just add one of those cheap Chinese USB serial dongles, and wire it to one of the serial ports on the Teensy.
    Beware that, for that setup, making sure the baud rate matches up is actually...
  28. Replies
    81
    Views
    38,185

    Re: First steps for Super Mega Microbot

    Nice!

    Don't show it to my wife; she's afraid of big jumpy crawly things ...
  29. Replies
    6
    Views
    1,831

    Question(s) Re: Walking Sequence for MK-III Hexapod?

    Ah! The button testing doesn't return values "greater than five" like the stick does.
    Instead, you should test for "is not zero" because the buttons field is a bit mask:


    if ((command.buttons &...
  30. Replies
    6
    Views
    1,831

    Question(s) Re: Walking Sequence for MK-III Hexapod?

    If it's OK to use existing software, how about downloading the code for the Phantom Hex?
    Then you can adjust it to read from the "button" input to decode where to walk, instead of the "stick" input....
  31. Replies
    4
    Views
    1,206

    Question(s) Re: 4 Dof Hexapod Torque calculations

    Each joint can be individually calculated as if all the other joints are stiff, so I get pretty close by measuring the distance to the base points and the center of mass / weight of the body between...
  32. Question(s) Re: New Member - Interested in retrofitting an industrial robot for hobby

    The ROS platform uses the ODE library I think (Open Dynamics Engine) which is open source.



    The bastards!
  33. Replies
    3
    Views
    1,196

    Re: double eagle AEGs out of stock?

    I think the gun that the double eagle is based on is pretty old in the airsoft scene by now. Like most consumer markets, that market seems to work on trends and new products ...

    Many gearboxes...
  34. Question(s) Re: New Member - Interested in retrofitting an industrial robot for hobby

    No, I mean run the calculations on the fly! You can use the simulation software to come up with a solution, and then back-calculate what the actual angles of actuation are by reading out the state of...
  35. Question(s) Re: New Member - Interested in retrofitting an industrial robot for hobby

    This guy is building his own 6DOF arm, mainly using 3D printing: https://www.youtube.com/watch?v=oFCUw1pXlnA
    He's using steppers in this series, but he has a newer series where he uses the ODrive...
  36. Question(s) Re: Absolute zero position for Dynamixel XM430-W350-R: How to change it?

    The documentation for Dynamixel protocol 2 (used by the XM430) talks about this. There is, for example, a "multi turn" mode. Or you can turn on "wheel mode," move forward, and then turn back on...
  37. Replies
    64
    Views
    14,100

    Re: The task (lawn mower topic)

    ... radars, railguns, electric arc based armor, ...

    :-D
  38. Replies
    11
    Views
    2,728

    Re: Hexapod for a beginner

    The OpenCM 9.04-C needs an adapter cable, or the board, because it doesn't have the right connector.
    The 9.04-A lets you solder in the connectors yourself, so you can buy the right connectors from...
  39. Replies
    11
    Views
    2,728

    Re: Hexapod for a beginner

    Looks like a good list!

    If you use the "-T" servos, you don't need the 485 expansion board. You can get the "A" variant of the OpenCM and solder in the right headers yourself, I think. At least,...
  40. Replies
    0
    Views
    678

    Kodomoroid from up close

    I had the opportunity to see the Kodomoroid up close in person today.
    It's creepy, as almost all human-emulation faces are. But they're getting closer!


    https://youtu.be/X3FOLFj0nHE
Results 1 to 40 of 500
Page 1 of 13 1 2 3 4