Search:

Type: Posts; User: metaform3d; Keyword(s):

Page 1 of 10 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    97
    Views
    65,419

    Just For Fun Re: The ultimate robot video collection

    Sure it isn't Chucky? It was clearly built originally with skin, and on a pretty high budget...
  2. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #1, Fold-bot

    Building robots is hard. Not just because of the inherent challenges of dealing with technology at the limit of what's possible, but also because it requires meshing so many different disciplines....
  3. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #2, Hylozoic Soil

    At some level all robots take their cues from life. Some are utilitarian designs that allow machines to perform some task that had previously been the province of humans. Some mimic natural forms in...
  4. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #3, You!

    Now that we've disposed of the frivolous matters we're starting to get to the real meat of robotics -- robot slaves! For any Dr Who fan the idea of turning humans into robots who obey remote control...
  5. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #4, Anthropomorphization

    Anyone who studies biology learns about anthropomorphism. This is the mental category error that assumes that anything with complex behaviors can be treated as if it is human. If you are studying the...
  6. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #5, Emotive Plant

    Anyone who thinks that houseplants are emotive beings and yet has to deal with the embarrassing reality that they simply don't care what you say or do -- they need this device. It's an artificial...
  7. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #6, Pea Spotting

    This thing has "hobby robotics" written all over it. Another art installation, the Growth Rendering Device is basically a machine that transcribes the shape of a growing pea shoot over a course of...
  8. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #7, Breathing Sweater

    I think the freakiest thing about this robot is that you wear it. It's a sweater. Woven with galvanic-skin-response sensors and shape-memory alloy threads (muscle wire), it responds to the wearer's...
  9. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #8, Funbrella

    If Alexander Graham Bell had any sense of whimsy he would have given up on this whole idea of transmitting sound by electricity. Inventions with practical applications, let alone something that would...
  10. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #9 Third-Person Interface

    As our entertainment systems, fixtures and appliances become more networked and laden with features the challenge becomes how to control them all. First-person control involves walking up to the...
  11. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009: #10 "YOTARO"

    Not sure what it is about Japanese robot researchers, but they always want to make the robot be your friend. Sometimes they do manage to make robots cute or engaging and you want to have them around....
  12. Replies
    12
    Views
    5,945

    Robots of SIGGRAPH 2009

    I've just gotten back from SIGGRAPH 2009 in New Orleans, and as usual the most interesting part of the show for me were the robots. There's a strange area of overlap between computer graphics and...
  13. Discussion Re: A good Sci-Fi / Robot book to read on the plane?

    For robots I'd go for Philip K. Dick. A book of short stories makes a nice sampler.
  14. Replies
    3
    Views
    12,484

    Re: Talk to Arduino with Visual Studio in C++

    Not finding "_main" sounds like a problem with project settings. Have you been able to build a "Hello World" test app?
  15. Replies
    14
    Views
    28,759

    Sticky: Re: Calculate Motor and Wheel Size

    I've completed an introductory tutorial based on insights from this analysis. Still using T instead of tau though.
  16. Question(s) Re: How do I cause a dc motor to hold itself at its current position?

    Don't know what the application is so this may not be helpful, but for simple two-position lever the load itself can be made to do the work. You rotate the arm from 0 to 90 and trip a switch at the...
  17. News/Announcement Re: Want to win a Bioloid? Announcing the TRC Tutorial Contest!

    Wow - I so want to win a Bioloid. Is there any sort of clearing house so that I know I'm doing something unique and not competing head-to-head with someone doing the same topic?
  18. Replies
    6
    Views
    3,966

    Re: Axon hardware interrupts, help!

    You could try:

    rprintf("Left:%d Right:%d\n", (int)left_clicks, (int)right_clicks);
  19. Replies
    6
    Views
    3,966

    Re: Axon hardware interrupts, help!

    Might be the size of the data type. printf() has to infer the size of the data pushed on the stack from the format string, so if you use the wrong formats it'll look at the wrong part of the stack....
  20. Question(s) Re: Advise needed for simple DC motor control project

    Well it's a funny old world. I haven't had much time for robotics lately, but for my daughter's 11th birthday -- which had a kind of retro 80's theme -- I did build a variable-speed disco ball to go...
  21. Replies
    3
    Views
    6,570

    Question(s) Re: Pressure sensitive dance floor

    I think any physical deflection is bad for this project. I'd suggest force sensing resistor films like this (or similar) at one or two corners of each square:
    ...
  22. Replies
    8
    Views
    10,705

    Re: My RoboBuilder mod

    Why? Was "Robot Hitler" already taken?
  23. Replies
    259
    Views
    80,286

    Re: Wireless Video

    Too bad. Exposure control is a big issue with my indoor/outdoor day/night application. Can't do any reasonable image processing if it's washed out or too dark to start with. Any way to make/buy an...
  24. Replies
    259
    Views
    80,286

    Re: Wireless Video

    Do none of these cameras have adjustable aperture or shutter time?
  25. Replies
    259
    Views
    80,286

    Re: Wireless Video

    Don't want to crash your thread since I'm not building a mech, but I've been lurking because do have need of a wireless webcam. I'm looking for at least 640x480 at 30fps, so the AIC250W is not...
  26. Replies
    9
    Views
    6,603

    Question(s) Re: Roomba 5xx sensor reading problems

    If there's one thing I've learned doing this crazy hobby it's: when in doubt, check your grounding! Even the professionals apparently get tripped up by faulty grounding.
  27. Replies
    24
    Views
    12,867

    Re: The cost to compete.

    Ya think? I've spent more that I should have and come up with crap. Patience, experience and skill are pretty much everything in this hobby/craft.
  28. Replies
    3
    Views
    3,415

    Just For Fun Re: Random Tools

    I like your angle iron. My solution was not nearly as hi-tech but works OK. It's basically a piece of string between a couple of nails on the bottom of a shelf. I clip the alligator leads to it.
  29. Replies
    7
    Views
    13,040

    Sticky: Re: Symbols for expressing equations.

    Cool! I guess the Web has solved all those thorny code-page issues. You mean we don't have to be limited to 7-bit ASCII anymore?

    Now can you get subscript and superscript in the text editor?
  30. Replies
    14
    Views
    28,759

    Sticky: Re: Calculate Motor and Wheel Size

    Let me put these last formulas to practical use. Suppose you're working on your heavyweight combat robot to end all combat robots. It weighs 220 lbs, has 10-inch tires, and you want it to have a max...
  31. Replies
    14
    Views
    28,759

    Sticky: Re: Calculate Motor and Wheel Size

    I thought I would take a crack at the question of acceleration -- how long does it take a wheeled bot to get to its maximum speed? For the idealized bot it turns out the answer is: never. On a level...
  32. Replies
    14
    Views
    28,759

    Sticky: Re: Calculate Motor and Wheel Size

    As I suspected a combination of logic, transcription and arithmetic errors made my examples give bad results. The mathematics are completely sound.

    The most basic error is in post #6. In fact a...
  33. Replies
    14
    Views
    28,759

    Sticky: Re: Calculate Motor and Wheel Size

    I believe the mathematics are essentially correct. I sprinkled some specific numeric examples through the text, however, and when I go back to verify those I get inconsistent results. I need to run...
  34. Replies
    14
    Views
    28,759

    Sticky: Re: Max wheel diameter on Servos.

    EDIT: There's something wrong with these numbers -- not sure what. Any thoughts on where I went wrong would be welcome.
  35. Replies
    14
    Views
    28,759

    Sticky: Re: Max wheel diameter on Servos.

    The optimal solution is when D is zero. I'm just going to stipulate this, but intuitively it means that we don't have so much torque or speed that we need to make the wheels extra large or extra...
  36. Replies
    14
    Views
    28,759

    Sticky: Re: Max wheel diameter on Servos.

    Motor speed is linearly proportional to load. Under no load the motor spins at its max RPM p0, while at stall torque it runs at zero RPM. So the RPM p of a motor under a torque load of L is:
    p = p0...
  37. Replies
    14
    Views
    28,759

    Sticky: Re: Max wheel diameter on Servos.

    What this computes is the maximum wheel size, which is the size at which the robot stalls going uphill. If the force that we're trying to counter from gravity is f, and the stall torque of the motor...
  38. Replies
    14
    Views
    28,759

    Sticky: Calculate Motor and Wheel Size

    It helps to draw a picture.

    http://forums.trossenrobotics.com/attachment.php?attachmentid=1123&stc=1&d=1233910760

    When you do this type of analysis it also helps to pick a unit system. I like...
  39. Replies
    23
    Views
    12,083

    Re: Cornell Minesweeper Pictures!

    I've seen this design on a number of bots. So the question is: what's the optimal angle for a given weight? If the bot is very light then angling the wheels like that increases the wheelbase, but if...
  40. Replies
    18
    Views
    10,239

    Re: Analog Output Controller

    F'ing-A. I suppose some kind of super-genius could get directly from A to C, but for my money if I know how to get from A to B and from B to C a little more legwork never hurt me.

    Unless I had a...
Results 1 to 40 of 378
Page 1 of 10 1 2 3 4