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Earthquake Alarm Using Recycled Materials [Project]
posted November 2 2013 13:51.02 by spic0m

Based on a 555 timer, a small DC 12 V relay and sounder from a faulty car alarm here is a functional seismic activity detector. It was hooked up to the UPS 12 V battery. The alarm is triggered by an earthquake and sounds for 5 minutes and then goes back to standby. Trigger mechanism is a pendulum that weighs 500 grams from a 2 meter line.

[Link: eeweb]

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