Vibration frequency measurement with a piezo sensor
It is possible but not necessary.

The best way is to drive like a MEMS or Xtal resonator which uses EMF current sensing to drive at resonant frequency. TI's solution is the DRV2605. It comes with other features to reduce energy consumption, and  fast start stop etc.

http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sloa188&amp;fileType=pdf