Arduino Seismic Activity Monitor

Posted on Feb 6, 2014

So to reduce the resonant frequency and get some useful signals, I took some washers slapped them on a bolt and some nuts and experimented. I used aOscilloscopewith FFT and changed the weight on the tip of the film until frequencies of around 40Hz were the largest. If you don`t own anoscilloscope, just add a little weight and then hit the sensor. It

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should flop around for about half a second to a second before coming to rest. As you can see from the picture, I taped down the base of the sensor. This is because the leads on the piezo film is flat, and tends to be loose inside the breadboard, so any vibrations tend to get lost in the movement of the leads. A Charge Amp takes the chargeacrossa capacitor and translates it into a voltage. If you know your electronics you can see that it is essentially an integrator, which prevents the charge across the Piezo film, which acts like a capacitor, from discharging quickly.

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