Subject:
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Re: GBC at BrickFest 2006
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 6 Sep 2006 01:12:39 GMT
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Viewed:
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9122 times
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In lugnet.robotics, David Hurley wrote:
> we had a few ball counters going: Rafe's impressive
> digital [mechanical] counter, Greg's analog one, and
> Brian's optical one...
Actually, my counter was mechanical, in that each ball temporarily opened a
normally closed touch sensor, and the RCX was just counting touches. For an
optical one, you can use a ball breaking a lightbeam (two light sensors pointed
at each other, for instance), but detecting the ball itself via reflected light
is a tougher issue... because each of those dang soccer balls could read as
nearly all black, or nearly all white... or anything inbetween.
> is there agreement on what the final ball tally was?
Probably not to any high accuracy - too often, something broke down and balls
had to be moved by hand, sometimes bypassing counters... and at least on Rafe's,
I think smnall hands may have dropped some balls in inappropriate places. I can
tell you on the spur line (not penalty box - there is *always* a section that's
less error prone than another, trust me) we counted up to 6663 balls during the
event.
--
Brian Davis
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Message has 1 Reply:
 | | Re: GBC at BrickFest 2006
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| (...) I had success with a ball detector using only one light sensor in my little interactive get-the-ball-in-the-hole module. If the ball went into the hole, it rolled past a light sensor (old RCX version; is there a new nxt one?). Across from the (...) (20 years ago, 6-Sep-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: GBC at BrickFest 2006
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| (...) That got me thinking...we had a few ball counters going: Rafe's impressive digital counter, Greg's analog one, and Brian's optical one in the "penalty box" with all of my modules (heh heh). My question is this: is there agreement on what the (...) (20 years ago, 5-Sep-06, to lugnet.robotics)
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