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Thread: Cheap humanoid

  1. #1
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    Cheap humanoid

    Hello,
    I've been trying to make a cheap humanoid (kind of impossible if I'm trying to make a nice one) but I'm going to try anyway.
    So, I bought 8 of some cheap chinese servos with .16 sec speed and 14kg torque(I half-believe them) for 8 bucks each. If these work out it would be $64 well spent but if not... oh well. My fault that I even tried them.
    Now I have to wait for that to come and school starts in roughly bout a month so I thought that I needed to test if the robot's future leg orientation would work well. So I made a miniature scaled leg with 4 servos with micro servos. (btw the robot's gonna have 4 dof in each leg)
    The parts for the mini scale was made using a bandsaw and drill press. No brakes pr anything like that...

    Attachment 1433

    Attachment 1434

    Attachment 1435

    Attachment 1436

    Attachment 1437
    these servos were attached together with scrap metal and servo tape (very effective)

    Attachment 1438

  2. #2
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    Re: Cheap humanoid

    Hey,

    Good Luck with this project...(not sarcastic...I actually mean it...good luck.) I gave this one a try about a year ago. What I ran into was two things...the cheap servos tend to burn out quickly, and while the torque ratings may be true, they come at the cost of accuracy. The cheap servos I've tried tend to "jitter".

    Keep us posted, and let us know how it goes.

    DB

  3. #3
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    Re: Cheap humanoid

    Please Note: You get what you pay for. The best humanoids are uber expensive. A BRAT is cheap. Compare them as "humanoids". Good luck and keep us posted.

  4. #4

    Re: Cheap humanoid

    Interesting topic, can't wait to see more
    Where did you buy these chinese servos ? Ebay ? Hobbyking ? Other ?

  5. #5
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    Re: Cheap humanoid

    here's a link.
    http://www.hobbycity.com/hobbycity/s..._10kg_/_.16sec
    P.S.- try at your own risk. hehe

  6. #6
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    Re: Cheap humanoid

    OK
    So I need a microcontroller to control this thing when it is built.
    I was looking at the SSC-32 from lynxmotion to control the servos and make movements but it has to be tethered to the computer. Any suggestions of controllers that can control up to 12 servos and have sensor inputs? Also I have like no programming experience. a cheap one would be great as I have a tight budget.

  7. #7
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    Re: Cheap humanoid

    Look at the Roboduino or Arduino family of microcontroller boards. If you pair one with and SSC32 then you wil have more than enough outputs and inputs to control this thing.
    "If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut."
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    Einstein

    Don't be a HelpVampire

  8. #8
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    Re: Cheap humanoid

    Are they hard to program? Or at leat learn?

  9. #9
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    Re: Cheap humanoid

    Yes. No. Maybe.

    [BEGIN: Philosophical Statement]
    "Hard to program" is an impossible to answer question unfortunately. How much programming experience do you have? If you don't know how to program, then you have to learn how to program before you can program. Then the question becomes not "how hard is it" but rather "how hard is it for you?"
    [END: Philosophical Statement]
    I Void Warranties´┐Ż

  10. #10
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    Re: Cheap humanoid

    The Arduino has great online documentation, I'd suggest reading through some of the tutorials on http://www.arduino.cc , if it seems completely foreign and crazy to understand your answer is "yes", if it seems fairly manageable, then no.

    Of course, beyond just the learning of a programming language, the other question would be how much do you have to learn about humanoids, walking, and the construction of a pose-based gait engine (or whatever gait engine it is you choose to use).

    -Fergs

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