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Thread: Ok so I made a Whegbot. Its pretty cool actually :)

  1. #1
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    Ok so I made a Whegbot. Updated with a brain and eyes!



    This thing is too cute! Unfortunately I can't the video off of my phone until tommorow, but here are some pictures. :0
    Made with 4 view loader revolution hopper servo thingies with the impeller left on, zip tied together, with a battery pack on top. This is a lot of fun actually so I'm going to see if I can hook up a controller and get it to follow some sort of path.



    Last edited by Electricity; 08-11-2008 at 03:19 PM.
    This ain't nothing but a summer jam
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    Summer jam alright
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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    Cool!

    In the design you have there, you'd want a 2 channel motor controller and run it differential. If you use one of your servos and split the bot front from back, you could use the servo for left-right turn and run all the motors from one channel of a motor controller. That's effectively what the original design is doing. That will also help time the legs out of phase so that it will scramble over things like a bug does.
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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    Thats a good idea. I managed to get a video uploaded, its not my favorite video, but its kind of funny.
    Clicky for video
    I picked up some of these guys Which will probably work better then the servos I have now.
    What if I split the bot left and right? That way it could turn kind of like a tank.
    This ain't nothing but a summer jam
    Brown skin and cinnamon tans, whoa!
    This ain't nothing but a summer jam
    We're gonna party as much as we can
    Hey-yeah, ooh, hey-yeah
    Summer jam alright
    Hey-yeah, ooh, hey-yeah

  4. #4
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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    You shouldn't need to do anything any different for differential (tank) steering - just hook-up a two channel motor controller.

    The motor you hold in your hand will likely need to be geared-down a BUNCH. It's probably running at least 3000 RPM, likely 9000-18000 rpm. Sounds cool, but getting the 'bot to "hook up" and find any traction would be nigh on impossible at those speeds.
    I Void Warranties�

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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    No load RPM is 16000, I got it for a different project, but i thought it might be cool for this one as well. I'll just stick with the original servos. I guess maybe I don't understand how a motor controller works. I'll have to look into it.
    Thanks Jodi!
    This ain't nothing but a summer jam
    Brown skin and cinnamon tans, whoa!
    This ain't nothing but a summer jam
    We're gonna party as much as we can
    Hey-yeah, ooh, hey-yeah
    Summer jam alright
    Hey-yeah, ooh, hey-yeah

  6. #6
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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    Yeah, there are a couple of simple ways to make your own h-bridge to drive the motors. It's pretty cheap, you only have to buy the components.

    They have some books in some lybrairies. Otherwise there are some websites that explains it fairly well.

    By the way, someone should do a tutorial to build a motor driver. Would be interesting to have in a thread.

  7. #7

    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    That came together quickly. Clever use of scavenged parts.

    I'll bring a surplus little single channel motor controller (stock 1/18 race car ESC) with me when I stop by the shop if you need one and want to try it.

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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    You are really getting in to building robots out of scrap! I can see the fun of doing that and they are good looking to! I cant wait to see what you strap on to your new motors!

    Keep on going!!

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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    Great work! Did you take any video of it driving/walking?

    I was also very fascinated of the simple but very effective principle of the Whegbots.
    Cool!

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    Re: Ok so I made a Whegbot. Its pretty cool actually :)

    Quote Originally Posted by sam View Post
    By the way, someone should do a tutorial to build a motor driver. Would be interesting to have in a thread.
    I'll see what I can come up with.
    Have to go to my cousin's wedding in half an hour though, but I'll see what I can come up with over the weekend.

    Any prefs on what to use?

    I'm thinking simple transistors, abusing buffers, FET's, and simple out-of-the-box motor driver IC's (L298 sort of thing)
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