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What's the cheapest way to detect vibration with Arduino?

What's the vibration sensor that I need?

I want to detect PING PONG NET vibration and light on led if touched.

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Can you be more specific? Depending of what you wanna do, maybe it's not necessary to use a vibration sensor. – Daniel Grillo Mar 29 '11 at 12:30
@Daniel See edit. – elpsk Mar 29 '11 at 12:35

2 Answers

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Piezo sensors are cheap, reliable and designed for the purpose you suggest - arduino tutorial

In the uk, bitsbox has one for 75p. You can probably find others cheaper, or salvage from electronic toys.

EDIT following poster's clarification of use: Sound is vibration through the air, I see no reason why a piezo sensor cannot accomplish what you suggest, but the form factor may not be ideal for fixing to ping pong nets! I think a flex sensor would be more suitable, sewn into the top of the net.

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Can i use piezo to detect if the ball touch or not the pingpong net? Or it detect only vibration sound? – elpsk Mar 29 '11 at 12:40
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An optical or magnetic sensor mounted mid net, bottom edge might be a good way to acomplish this. Might also detect vibrations in the table, as might any sensor.

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