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Originally Posted by Don Rotolo
Umm, what about a beam-break sensor? Super simple to build, just as easy to calibrate, portable, battery-powerable, and will work with any shooter.
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You've been reading people's minds/posts, haven't you?
Vince Wilczynski in
this post proposed the very same thing. Vince's setup uses 2 IR sensors (Emitter/Sensor combo, I recognized it as having been shipped in FRC kits sometime in the past 2 years), one at the start of a "tube" and the other at the end, and uses LabVIEW and a USB-DAQ device to measure the speed of the ball traveling through the tube (measures the time between the normally-low digital response from the sensors go "high"). It's not battery powered to my knowledge, but could be. And it's very effective, Vince said his tests worked out fairly well at a "mini-meet" he tried it out at.
-Danny