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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
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