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Scoring 2013, I can do better than that!
A Frisbee has a a defined weight, so weighing them is one strategy for counting how many in a goal. A strain sensor with +/- 300 grams is a great choice, settlement time may be an issue.
But scoring does seem to be a problem. And since HindSight (tm) is always 100% there may be better ways.
So how would you have scored?
As a VEX and Arduino guy, I would done an pair of Sonar Senors. Mounted on each side of the top opening pointing down and across to cover the opening. Two sensors triggered = score.
But since the Sonar needs a pulse (so there is a read/write cycle), I would go with a short distance IR sensor, then I can get a constant read.
What would have been your plan?
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Foster - VEX Delaware - 17 teams -- Chief Roboteer STEMRobotics.org
2010 - Mentor of the Year - VEX Clean Sweep World Championship
2006-2016, a decade of doing VEX, time really flies while having fun
Downingtown Area Robotics Web site and VEXMen Team Site come see what we can do for you.
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I wonder if the GDC had his extraordinary achievements in mind for the 2012 game. - MagiChau [more] 
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