earthquake sensor

tim45z10May 2, 2014

I made a small earthquake sensor. It is a tripod, with a pinball hanging inside a copper wire. The schematic consists of a 9vdc battery, switch, led and speaker.
The amount of contact required between the ball and copper wire to activate, is more than I would like. Continuity between the ball and the pendulem wire is good.
Would reversing polarity make a difference in contact pressure required to complete the circuit?
Thank you
Tim

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toxcrusadr

No, it shouldn't make any difference. Interesting project though.

    Bookmark   May 27, 2014 at 3:54PM
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tim45z10

Any ideas to reduce the amount of contact required to complete the circiut.

    Bookmark   June 3, 2014 at 4:12PM
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tim45z10

Any ideas to reduce the amount of contact required to complete the circiut.

    Bookmark   June 3, 2014 at 4:15PM
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tim45z10

I am going to try and reduce the diameter of the copper wire that surrounds the swinging ball.

    Bookmark   June 21, 2014 at 4:45PM
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toxcrusadr

Seems the problem is in the resistance in the connection. Use a very clean, very smooth ball and wire. Also consider noncorrodable wire - stainless steel? Precious metals would be expensive. Silver wire is less than gold but it tarnishes.

Or, use something with larger surface area to make contact with, so more current can flow. A piece of copper foil instead of a wire.

    Bookmark   July 17, 2014 at 6:31PM
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tim45z10

Thanks for the metal change idea. I have what I was told is platinum wire from a genetic code sequencer. I hope I can find it.

    Bookmark   July 18, 2014 at 6:19PM
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