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In lugnet.events.brickworld, David Schilling wrote:
> In lugnet.events.brickworld, Rafe Donahue wrote:
> > Ok, thinking out loud now: Well, what about a home run derby or the like? Maybe
> > a machine that pitches and a machine that hits... We could use those red and
> > blue spheres that come with the nxt... Would ultrasonic sensor work for
> > detecting the moving ball?
>
> Unfortunately the ultrasonic sensor can't even detect the red and blue balls
> when stationary. (Unless you're REAL close: within an inch or two.) Their
> surface doesn't reflect much sound (perhaps something to do with the index of
> refraction), and what it does reflect is so spread out (because of the geometry)
> that you don't get a reading.
>
> You'll either have to find another way of detecting the balls, or you can try
> wrapping your balls in tinfoil. The foil has high reflectivity of sound, and
> there are usually enough crinkles in the foil that you get a reading even from
> some distance.
>
> --
> David Schilling
Although a robot pitcher and robot hitter would be very very kewl, just a robot
pitcher and wireless remote control hitter would be very kewl. Like those old
baseball machines at the beach. One would have to anticipate the lag and the
speed of the pitch, etc. Now of course could have different designs of hitter--a
normal one and a Barry Bonds steroid enhanced one that has more bat speed
because of no-standard parts.
Also it seems like one could also embed an led light(s) into the balls and a
light sensor could then pick it up. Rob --I am quite sure--could provide the
ball with the proper wavelength of light to maximize the sensitivity of the
sensor. Then could play in the dark without lights and still see the path of the
ball. Then could still play in Wrigley-or did they finally add lights?
Tommy
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