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An upgraded version of MRA2000.
About this creation


  • 2 RCX

  • 6 Motors

  • 1 Light Sensor

  • 5 Touch Sensor

  • Downloads:

  • Movie(663kb)

  • Movie(690kb)

  • Info:

    MRA-U is an upgraded version of MRA2000. I wanted to build a robotic arm that was as big as possible but also as compact as possible. So I decided to build a six degree of freedom arm with six sensors. MRA-U is the result, one thing to note is that there is not a
    single 1x16 technic beam used in this robot, the largest are 1x12s but there is only a few of them. Anyways it is capable of folding up, and fully extending the arm. The arm can be fully extended and folded up by the motors them selfs, no human assistance is requred. MRA-U is designed to drive around like a rover untill it hits an object. MRA-U will then back up and turn a little to line up with the object, it will then open the grabber, unfold the arm and check to see if the light sensor reads an object in the grabber. If it does then it will pick the object up, however, if it does not see a object, MRA-U will assume that the object is to big to pick up. It will then fold up the arm and go a different direction.
    As far as the body of the robot goes, it uses the same basic module as Bugger, but with an arm attached to it. MRA-U
    is the second project that I made to showcase this module, which can be found here: TT Module Three out of the five touch sensors are used to tell the RCXes when each section of the arm is folded up. The other two are on the front and make up the
    bumpers. The light sensor is in the grabber and is used to detect obsticles. Finally, as the RCXes go, if you are looking towards
    MRA-U from the front, the left RCX controls the grabber and the treads, and the right RCX controls the arm. Well I hope that explains how MRA-U works.

    I have allways liked robotic arms, especially ones that are mobile. My first good one MRA2000 was a lot of fun, however, I wanted a better one that had more degrees of freedom. MRA-U is the result. I made a couple programs to test the different functions, however, I never got around to making one program to do everything. If you go here: MRA-U you can view larger pictures of this invention, just click on the sliding pictures on the page.

    More pics


     I like it 
      November 15, 2005
    Man, I see its just mini fig builders why r voting. But i see this is real cool thing :). But can it raise its arm?
    By Daron Williams
    Add to my favorite builders

    people like this. See who.

    2,968 visitors
    1 comment
    Added April 2, 2004

    LEGO models my own creation MOCpages toys shop MRA-URobotics

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