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Thread: some help please

  1. Question some help please

    Hey guys I'm trying to build a hexabot but I'm totally new in the field so I've been looking all other the internet for tutorials and guidelines to find out what to do.

    I know gotta have some essential components like: servos (for movement), a controller, a receiver, code, some batteries and a way to control it (I'm thinking maybe using a PS2 or PS3 controller).

    Can any of you point me in the right path to get this kind of knowledge?

    Thanks in advance.

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    Re: some help please

    Hey m1gu3!

    We carry CrustCrawler's HexCrawler HDATS Basic Kit Chassis:

    http://www.trossenrobotics.com/store...ler-HDATS.aspx

    It doesn't come with the controller, but it does come with all of the servos you'll need.

    Since you mentioned that you are totally new though, I'd recommend starting off with an entire kit complete with basic stamp and everything such as the one from Crustcrawler for $897:

    http://www.crustcrawler.com/products...ats.php?prod=4


    I don't believe they have any more of these left though, but call them up to be sure. They're changing their robots over to using the Dynamixel AX-12 servos, which we'll be carrying when they finish doing so. The Dynamixel AX-12 servos have far more potential than your standard hobby servo, so this is definitely a good move No word yet on when this will all happen though.


    However, you mentioned that you are new to robotics, but what sort of background do you have? If you're totally new to the field and all the areas of knowledge that are required to build robots, may I recommend starting much smaller than what you are looking at now? Unless you have experience with some of the areas that robotics involves, what you are trying to accomplish as a first time robotics project will have many, many obstacles, which will involve a tremendous amount of patience

    �In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed�
    - Charles Darwin

  3. Re: some help please

    hey thanks for the reply Alex, I have some background in programming so that wont be a problem at all. I just need for instance knowing what kind of components do I need. Im pretty sure to need a servo controller or receiver just checked this one that are my two main options:

    1) http://www.trossenrobotics.com/store...ontroller.aspx
    (takes up to 32 servos (believe so))

    and this one from lynxmotion.com

    2) http://www.lynxmotion.com/Category.aspx?CategoryID=66
    (this one has connectivity to a ps2 controller what I wanted to do from the beginning and have some king of expansible processing capabilities)

    - so which one of those 2 should I choose? (Am I asking to much?)

    - what are the main components on a robot?

    I alredy have 20 micro servos but project will one take 16 using 3 on each leg, having 6 legs. By the way Im using lego pieces to build the chassis so it would be lighter.

    so what else do I need? (receivers, controllers, software, anything...) I was thinking maybe controlling the hexapod from my cellphone, a 8125 using windows mobile although I want to use the ps2 controller too , that implies using Microsoft robotics studio I suppose.

    maybe some cameras in the future, a motion sensor and a sound sensor. just for know lets make it move first I'd be happy if that happens.

    thanks for the help.
    Last edited by m1gu3; 05-07-2008 at 09:23 AM.

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    Re: some help please

    Hi m1gu3,

    Some of these questions are tough to answer for you unfortunately. Questions like, "What are the main components of a robot?" are very broad and pretty much require a full lesson to teach. (Not to mention no two robots are alike and have the same parts.) I suggest picking up some books on robotics or just reading through a lot of websites and forums to learn how many people are putting their projects together. You can find a lot on the internet when it comes to robotics.

    The Lynxmotion controller is a very popular pick for controlling hexabots. The one we sell is a good choice if you are going to control your robot from a computer. It would stay tethered and your code would run on the computer.

    The Atom Bot Board looks like it has more choices for downloading your code to the controller and letting it run autonomously. Looks like they sell manuals at Lynxmotion to teach people how to do that.

    So for your project if you use one of those controllers you need your mechanical body, 18 servos, a power supply, your controller of choice, and your computer to write programs on.

    I can't answer about controlling a robot directly from a PS2 controller or a cell phone. That's over my head unfortunately

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    Re: some help please

    Quadcrawler posts moved to new thread:

    http://forums.trossenrobotics.com/showthread.php?t=1247

    �In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed�
    - Charles Darwin

  6. Re: some help please

    thx for the help guys, sorry haven't replied for months but been busy, very busy. got a manual from a company that does hexapods and offer their clients a complete manual on how to start assembling the robot.

    also got pretty much most of the components from lynxmotion including the chassis the other day, actually I was planning to build it from lego pieces but got it aluminum made couldn't fight but getting it.

    pretty much right now have:
    - main board plus a separate processor
    - servo controller, think it has up to 32 channels
    - the chassis of course

    still need:
    - 16 servos, metal geared ones that I'll get from ebay
    - servo brackets
    - battery pack
    - a way to control it

    possible adaptation after is putted together:
    - camera
    - motion sensing
    - sound sensing
    - pressure sensing

    appreciate any suggestions, still looking for a good programming language that helps me with this, that might be a problem because a use mac but there is dual boot.

    Thanks for your help guys.
    Last edited by m1gu3; 05-07-2008 at 09:42 AM.

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    Re: some help please

    The programming language you can use usually depends on what controller you picked up. If you purchased the Basic Atom and bot board, you're pretty much stuck using it's version of basic. The Basic Atom/Bot Board does allow for control via wireless PS2 controller, LM has tons of info on setting this up.

    Also just a note- be careful buying servos on ebay. Just because they're metal gear doesnt mean they're good. Specifically the Towerpro servos that are DIRT cheap on ebay, are dirt cheap for a reason. They are inaccurate, prone to failure, and have a lot of slop.

    With servos you pretty much get what you pay for, personally I wouldn't build any walker with anything less than HS-645s

  8. #8

    Re: some help please

    Quote Originally Posted by Tyberius View Post
    With servos you pretty much get what you pay for, personally I wouldn't build any walker with anything less than HS-645s
    I am even using three HS-645MG and three HS-475HB servos in the arm I have on W.A.L.T.E.R. now. It grew to 4DOF. I would never consider using anything less than an HS-475HB for any robotics application.

    8-Dale
    I can handle complexity. It's the simple things that confound me.
    Do everything in moderation, ESPECIALLY, moderation..
    Sometimes the only way to win, is not to play.. -- Stephen Falken

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    Re: some help please

    Personally, all future robotic endeavours for me will be using the AX-12s. The bang per buck plus easy usb connectivity is too great to pass up. Crustcrawlers is going in the right direction switching over to the Dynamixels.

  10. #10

    Re: some help please

    Quote Originally Posted by Tyberius View Post
    Personally, all future robotic endeavours for me will be using the AX-12s. The bang per buck plus easy usb connectivity is too great to pass up. Crustcrawlers is going in the right direction switching over to the Dynamixels.
    They do look interesting, for sure. I can imagine your J5 using AX-12's. I've been thinking about eventually getting two of them to tinker with and see if I can interface them to Hammer.

    8-Dale
    I can handle complexity. It's the simple things that confound me.
    Do everything in moderation, ESPECIALLY, moderation..
    Sometimes the only way to win, is not to play.. -- Stephen Falken

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