>I would like to compare the two, but the immediate push was
>to get something, anything, ready this week. Now that there's
>a prototype working, which fortunately took surprisingly
>little time, the pressure's off a little and I can now shop
>around and experiment with other devices, maybe sort out a
>Plan A and a Plan B

I think the accelerometer is the "commercial" way to go to get something
rugged. But the ping pong ball is ideal for the nature of the experiment.

However, Jinx, to do a "production" version, think about using the "egg"
that Kinder Surprise toys come in. The two halves open up, slip the ball
bearing in, and clip back together. Don't know how you opened the ping pong
ball, but I see potential problems sealing it again so you do not loose the
ball bearing. These may help that scenario.

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