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You have this large water reservoir, for example, a bathtub. How can you detect when an object is thrown (rock, etc) into a big water reservoir? Vibrating sensor, ultrasonic etc?

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    \$\begingroup\$ Microphone listening for a splash? \$\endgroup\$
    – W5VO
    Apr 21 '15 at 18:40
  • \$\begingroup\$ yeah a microphone seems a good idea to me, plus it's very cheap. this question isn't much about electronics design though... \$\endgroup\$ Apr 21 '15 at 18:56
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    \$\begingroup\$ microphone or hydrophone should work \$\endgroup\$
    – mkeith
    Apr 21 '15 at 19:10
  • \$\begingroup\$ How big is the reservoir? When you say large and reservoir, I think 'pond' as a minimum, not bathtub. Acoustics would work in the bathtub, but probably not the pond. Perhaps a pressure sensor, or an array of them for larger containments. \$\endgroup\$
    – R Drast
    Apr 22 '15 at 13:20
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The easiest way would be to use a simple accelerometer, since there may be background noise like wind,etc. Just put it on a floating little buoy of sorts.

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  • \$\begingroup\$ I had the same idea. I think you don't necessarily need a accelerometer though. \$\endgroup\$
    – Password
    Apr 23 '15 at 6:42
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The easiest way on my opinion would be to catch the waves on the surface of the liquid(water). Could b easily done even with a mechanic switch anchored to the side at the surface level and a piece of Styrofoam, which following the waves will move up and down and turn the switch on and off, or at the bottom and via a string and a piece of styrofoam floating on the surface and pulling and loosening the string/cord while waves are present .

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