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earthquake sensor

Posted by tim45z10 (My Page) on
Fri, May 2, 14 at 18:32

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


Follow-Up Postings:

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RE: earthquake sensor

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


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RE: earthquake sensor

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


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RE: earthquake sensor

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


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RE: earthquake sensor

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


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RE: earthquake sensor

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.


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RE: earthquake sensor

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.


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