Re: Limit Switch Issues
Recommend going optical.
https://www.sparkfun.com/products/9299
https://www.sparkfun.com/products/9322
(Get the breakout board with the photo interrupter.)
Or maybe try this:
https://www.sparkfun.com/products/246
If nothing else, extend a small, opaque tab in a position such that the above products give you a return at an appropriate location.
We tested the photo interrupter out for a home made linear encoder this year. While we never used it, the concept worked quite well, with the interrupter/optical limit switch hooked to the digital input on the sidecar. The Optical Detector / Phototransistor could pointed across the path of your mechanism, but close enough to the path so that when the mechanism passed across the interrupter, you got a response. Should be very accurate. While we have not tried this, I plan to test out the concept this summer, to have another item in our bag of tricks.
__________________
Jim Grove, Mentor
firebirds1915.blogspot.com
(2007-2017) 1915, McKinley Tech HS, Washington, DC
(2009) 2932, Mid-Pac Institute, Honolulu, HI (Rookie Season)
(2011) 2425, Hillsborough HS, Tampa, FL
(2013-2015) 4464, College Park, MD, 2013 Rookie All Star Winner and 2014 Regional Champions, Washington, DC
FIRST is not rocket science. But it is like drinking from a fire hose.
Last edited by Pendulum^-1 : 09-05-2013 at 07:31.
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