Posted by Robotica May 08, 2014 RoboCamp MINDSTORMS and WeDo learning courses Share Get link Facebook Twitter Pinterest Email Other Apps 1 comment
Who is the author of the robot?
The only reliable way I've seen was originated by the SMART group in Washington state, and involves the brilliant idea of spinning the balls under the sensor, looking for changes in the readings - basketballs are fairly uniform, while soccer balls (*most* of the time) will have a non-uniform reflection (as black lines or white regions rotate under the sensor). I believe it was Dave Shilling and/or Gus Jansen who came up with this method, and it's the only one I've gotten to reliably work.
As to the gate, yes, that is nice. I'd guess the upstream side ends up being a "chamber" or "liftpad" that is only one gumball wide. If there are two (or more likely many more) in line, when that lift pad goes up it only pushes the first gumball in the chain upwards, like the ball release mechanism on my Digicomp II model.
It's a really well-done, elegant example of a robot. The other thing I find fascinating is how it's accumulated over *one million hits* in just a week on YouTube! That in itself is an unheard of hit rate for something with the tags "lego nxt"!!
Yes, though it's a nice robot, that's rather ... hm ... surprising.
Considering the usual hit rates even very spectacular LEGO robots get on YouTube (the topic is a somewhat particular part of the universe, after all), it's hard to imagine that in fact so many different people watched the video in such a short time.