Subject:
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Re: turtle coding kit (Re: How would we (the rest of us) communicate ideas to the MDP?)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 22 Feb 2006 19:48:40 GMT
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Viewed:
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2492 times
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In lugnet.robotics, David Koudys wrote:
> In lugnet.robotics, Justin Fisher wrote:
>
> <snip>
>
> > I'd go further than that - I may be wrong here, but AFAIK professional
> > roboticists largely consider dead reckoning to be a losing game, an amateur
> > red-herring that you can waste all the time and money you want on and it will
> > still never work reliably - traction differs as the robot travels various
> > surfaces, wheels slip, a pet or collision or other interaction moves the robot
> > without it being aware, a gear slips, etc etc. Watching a motor counter instead
> > of the world seems to be the one way to guarentee that a robot never knows where
> > it is, where to go, or how to navigate the obstacles around it.
> >
> > I don't know anything about the FLL competitions, but it sounds like they're
> > designed to offer highly consistant conditions in order to make dead-reckoning a
> > plausible design approach. I wonder if this might work slightly against learning
> > about making real-world useful robots? Motor counters are incredibly useful in
> > all sorts of ways for robots and other Mindstorms things, but if people are
> > excited over their potential applications for navigation, that seems like
> > something isn't right.
> >
> > But like I said, I'm not familiar with how the FLL comps work.
>
> When I was a mentor for a local FLL team, I was so hard pressed to convince the
> kids that 'dead reconing' wasn't the way to go.
>
> THey had the entire program coded like 'go straight for 10 seconds, then turn
> left for 2', thinking that this would get them trhu the maze.
>
> THe problem was, as I kept trying to show them, is that if you start your 'bot
> even at the slightest different position or angle, your 'bot will be so far out
> of position by the time it should have reached the finish line in the maze.
>
> But they persisted in the timing solution. didn't do so well...
>
> Eh, it was a valiant effort.
>
> Dave K
This sounds like a good demo that someone within the MDP program can create
(hint, hint, wink wink, nudge, nudge).
Show the difference between navigating through a maze using (1) the 'dead
reconing' method, (2) the ultrasound sensor and the ????? method, (3) the bump
into wall and turn left method, (4) ??? (and some other methods)... and
describes the advantages and disadvantages of each method.
Ed
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