Quote:
Originally Posted by billbo911
I have an Arduino Sketch that you are free to use to create a Chronometer. All you need is a couple of sensors to attach that can sense when the disk passes. You may have to change the Interrupt type from "RISING" to "FALLING" depending on the sensors you use.
Just edit the distance value in the code to match the separation distance between the sensors and it will spit out the velocity in ft/sec whenever the two sensors are triggered by a passing object.
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I built a limit-switch triggered arduino timer tonight, I'll do some testing with the team tomorrow and report my results here. We will be shooting at a fridge around 24' 9" away using two different types of wheels. The first an 8" AM Pneumatic wheel and the second an 8" plaction wheel.
You can see a video of our shooter here;
http://www.youtube.com/watch?v=ThZCOtjVJmw