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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But I was thinking of a thousand ways to hack this challenge. Strictly within the rules, but blatantly disregarding the spirit of the challenge.

Did anyone say the table tops had to be at the exact same height? Or was that implied?

I think they are the same height, else you could just gun it :)

This will of course depend on the suspension of the bot that you have as the firm kind can case you to bounce right off the table!! I guess the next question would be, does it have to be in once piece on the other table.....(thinking of a lego mindstorm bot gunning it and landing on the other side....)  :)

It doesn't have to break in pieces on the other side, there are Lego shock absorbers, you know... All you need is a Speed Racer... and break hard! But the second table can be longer, no? I saw no dimensions for the tables...  And you can cover the second table in pillows...

But I would like to see a device that inflates a balloon with helium, then releases it for propelling the device over the gap and land on the other side!

Maybe they've upgraded the spring/cylinder shock absorber from a while back(I haven't kept up on the latest lego tech), but they seemed pretty springy to me which would cause bounce(or bottom out) and possible unintentional deviation from it's original path.

I guess you could also just launch the thing with a catapult(or mini trebuchet as they are far more accurate) as well and just have something to catch it on the other side. Brute force is not what I would call elegant....not that it has to be as long as it's within the rules of the challenge...

The balloon idea would work(in theory). though just fill it enough so that a slight upward push by fan motors could get it going. They've had rc units like this for a while. Just add a brain and go.

I thought of this weakness in my rules the next day......DOH!!!

(I was hoping to see creative robots/solutions to this problem)


But that's ok, I'm not changing the rules. As people are already building entries so we will go with what we have.

However a friend of mine did this a better way than that.

But you will have to wait till after wards for me to post a pictures of how he did this.

Me and another friend built folding bridge robots to solve this problem, which was a lot harder than one would immediately think.



Actually, the folding bridge was my initial thought...similar to the bridge crossing military vehicles....but that be tricky to put down and pick up among other issues. With some creativity, it could be done though. Thats not the direction I'm going in though. I would almost say, for bonus points("awesome award", you could post the other rules to see if it would affect the challenge, sort of an extra challenge that if you want to see if you could do it, but not necessarily have to) I'm curious about the rules you considered in the afterthought...


I'm sorry I can't answer that, as I don't want to influence what people build.


But think about this comp from a different perspective:

Your entries will inspire others to build something.

They will see moving parts, machine's thinking, and want to build one for themselves.

That's the real prize.

The spirit of the challenge is to be creative....if that is something simple and obvious, but gets the job done and done well(with a bit of flair for the cool factor), is that not part of the challenge?  :)

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