Using a piezo to find frequency

Hi, I'm thinking of getting a piezo sensor like this one http://www.meas-spec.com/product/t_product.aspx?id=2474 to measure the frequency of the vibrations of any surface I attach it to, using a micro like an arduino. However I haven't come up the circuitry to make this happen, any ideas?

Thanks

Maybe start here http://www.arduino.cc/en/Tutorial/Knock and here http://www.dtic.upf.edu/~jlozano/interfaces/blow_sensor.html

Frequency-to-voltage converter chip?

Riva:
Maybe start here http://www.arduino.cc/en/Tutorial/Knock and here http://www.dtic.upf.edu/~jlozano/interfaces/blow_sensor.html

Unfortunately, those applications are geared towards measuring vibration amplitude, not the frequency of the oscillations

Here a link, that doesn’t ask registration on data sheet request:

Measuring freq. looks pretty easy,

  1. pulseIn http://arduino.cc/en/Reference/PulseIn,
  2. library: http://interface.khm.de/index.php/lab/experiments/
    I would be cautious to connect sensor directly to arduino, as output voltage could jump up t0 90V !
    Use resistor in series, 100 k or more.

Joolz: Unfortunately, those applications are geared towards measuring vibration amplitude, not the frequency of the oscillations

Maybe use them as a guide to connecting a piezo transducer and then using an FFT library to derive the frequencies http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1286718155