One further data note: using the circuit from post #22 with the piezo sensor I mentioned above, with the Serial port set to 115200 baud and printing the value each time—which causes a 1.1ms delay between samples—the data looks far cleaner. The onset of the hit is far more obvious and should be easier to detect crisply.
@Phrogz, thanks for your thoughtful posts.
As an Arduino beginner, I found it was harder than I expected to make a safe schematic for this kind of vibration sensor. And unlike many other Arduino projects, this doesn't lend itself to tinkering if you don't understand the basics. If I mis-wire my LED project, it doesn't light, and I can try again. If I mis-wire an input sensor and damage my unit, trying again might require another Arduino.
So I was glad to see the results of your safe experiments, above. Thanks.
And this is clever:
I didn't see the need for that when I did my project, but now that I have your data, it seems sensible, and it doesn't sound hard to code.
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