Let's Make Robots!

Cross the gap.

Winners as voted on by my family as follows below:


Game: Cross the gap.

Objective: Build an autonomous robot that starts completely within a 12 inch by 12 inch by 12 inch square box.

It must then cross a 12 inch gap and stop on the other side without any part of the robot touching the start side when done.

In order to win you must show a video of your robot completing this task, show the robot measurements and gap measurements in the video, and include the LMR logo on the video.

Fastest time to do so, and meet these constraints wins. Timing will start when the robot leaves the start box till its on the second table and not touching the start table. In the event of a tie, or controversy, public vote will decide a winner.


Prize for fastest completion goes to:   antonio.caciuc

  • Freescale 68HC11 microcontroller, 32KB Flash RAM, RS232 serial port programming interface, 2-line by 16-character LCD, Piezo buzzer for sound, 4x DC motor ports, 6x servo motor ports, 9x Digital inputs, 8x Digital outputs, 21x Analog inputs, w/ Interactive C software and code examples.
  • a pair of new metal gear motors
  • some assorted sensors - new unused.




Prize for the robot I find most interesting goes to: Kelpy (I was close to picking the NXT entry, but really liked the fabrication.)

  • A new Parallax Basic Stamp controller, product details can be found on their website, w/ software, cable, tiny breadboard.
  • 1 new unused servo, 1 used servo of same brand.
  • some assorted sensors - new unused.


Prize my family voted for most interesting:    sebathorus  (the first event entry)

What did you win? You will find out soon enough.



I am emailing the winners to send them their prizes. So winners check your inbox.


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Might have to give this a shot in sketchup with the sketchyphysics plugin just for the hell of it, wouldnt end up being counted but I dont have skill or parts to build a real one.

Hmmm, it only just dawned on me that a 12 inch cube could hold a 20 inch diagonal....

SQR(12 *3) = 20.78

Mind you, that's going to take some pretty accurate placement on the other side :(

The rules only require the bot to fit w/i a cubic foot on the originating side and nothing being left on the originating side once the traversal is complete.

As for rik's comment, I too was noticing that a bot that fit diagonally w/i the 1 cubic foot area would easily be able to cover the distance required.

can you have two robots? like one that throws the other?

To me, this fits within the confines of the task requirements but not very creative as you could make a very small  bot and complete the objective fairly easily. I'd go with a Ballista myself and just have a pillow on the other side. 

I think this actually defeats the objective.

The one robot that throws another would remain on the first table. Same goes for a ballista.

Surely, the whole of the mechanism should be transferred from one square to the other? Or am I wrong?

Mind you, I don't agree with this method due to it's bruteforce technique, but I would argue that if you use a ballista, you are triggering something that is not the robot nor is it part of the robot, it's just part of the interactive environment that you have. Similar to having a black line for a line follower. It's not part of the robot, but the robot interacts with it by means of sensors. A ballista could be interacted with by the bot triggering the launch mechanism.....

So you're trying to get a bot across the way, if it is independent of another object, then you should be able to successfully complete the task as your BOT is across the gap, it fits within the confines of a 12x12x12 box and nothing of the BOT is touching the other side.. I don't agree with this technique of launching the bot, but hey, its up to the person entering the contest. 

You could have the thrown robot reel the throwing robot over to the other side.

I would think that throwing a robot is ok,

as the point is for the robot to cross the gap by any means,

but leaving any parts of a robot behind (or another robot) would be a fail.

The point is to leave nothing touching the starting side.


However if you wanna throw a robot and try to land it on the other table,

please use junk parts and post a video,

because I think we will all get a laugh when it breaks into bits!!!