detect the entry of a person in the prohibited or secured area by detecting the footsteps. For that purpose the three piezo sensors should be placed in side the floor on three directions.

The circuit is simple to build and using few common components. The three peizo sensors detects or senses the seismic waves that is amplified by the CA3140 operational amplifier IC, a 2N3904 transistor connected at the output of CA3140 IC triggers the 555 timer for a preset time period that depends on the 100uF capacitor. When the timer IC is triggered its output goes high and activate the UM66 alarm circuit. The project can be operated with any voltage from 9V to 12V DC.

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Here is a project of a multidirectional seismic sensor circuit. The circuit is very sensitive and can detect seismic waves generated by any mean for example volcanic eruptions, earthquakes and other sources that produces large or small seismic waves. The project can also be used to
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Multidirectional Seismic Sensor Circuit Diagram