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Potentiometers and limit switches would solve this problem.
We chose to use hard stops with timeouts. This is a more robust solution (less parts to break.. limit switches are very cheap & weak, especially in a hardcore compeition like this year) and could be implemented quickly. It's pretty much foolproof.. you don't have to worry about overextending your motor because a limit switch fails.
It works great, and anyone going to the New Haven, CT regional can stop by and visit team 562 for a demo!
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SPARK 562: Students Pursuing Applied Robotics Knowledge
2006 BAE Granite State Regional: Finalists with 319 and 176
2006 BAE Granite State Regional: Winners of Motorola Quality Award
2004 BAE Granite State Regional: 7th Seed
2004 Mayhem on the Merrimack Champions! Thanks, 61 and 1289!
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