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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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  • \$\begingroup\$ Can you be more specific? Depending of what you wanna do, maybe it's not necessary to use a vibration sensor. \$\endgroup\$ – Daniel Grillo Mar 29 '11 at 12:30
  • \$\begingroup\$ @Daniel See edit. \$\endgroup\$ – elp Mar 29 '11 at 12:35
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    \$\begingroup\$ Final result here: albertopasca.it/whiletrue/arduino-ping-pong-net-sensor-part-1 \$\endgroup\$ – elp Oct 6 '18 at 21:07
  • \$\begingroup\$ Great work!!! @elp \$\endgroup\$ – Daniel Grillo Oct 8 '18 at 20:42
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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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  • \$\begingroup\$ Can i use piezo to detect if the ball touch or not the pingpong net? Or it detect only vibration sound? \$\endgroup\$ – elp Mar 29 '11 at 12:40
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A cheap vibration sensor such as SW-18010P consisting of a fine spring wire coiled around a rigid wire in a sealed package may well be sensitive enough. They act as a momentary switch contact when jolted, and cost a few pennies.

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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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You may be interested in how to create a simple circuit using a piezo element and Arduino Uno that can detect vibration with high sensitivity http://davidhoulding.blogspot.com/2014/11/advanced-high-sensitivity-vibration.html Have fun.

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