I'd suggest you read the piezo film sensors technical manual from Measurement Specialties Inc. I'm guessing that is the kind of film you have. Great stuff. The technical manual shows how to both sense and excite the film, including examples of liquid measurement, hydrophones and speakers. It actually does not take much voltage to excite that Piezo Film Ltd •1990 Elf acquires Pennwalt Corp, and forms Elf Atochem North America. Piezo film group now Elf Atochem Sensors Inc •1993 AMP Inc acquires Piezo Film Sensors from Elf Atochem, renames as AMP Sensors. •1998 Measurement Specialties acquires Sensors division from AMP. Piezo Film History: >40 years Piezo Film DT Series Elements with Lead Attachment The DT series of piezo film sensors elements are rectangular elements of piezo film with silver ink screen printed electrodes. They are available in a variety of different sizes and thicknesses. Piezo film sensor elements are available with two lead attachment options. These include The Measurement Specialties LDT0-028K Piezo Film Vibra Tab sensor (also known as PZ-01) consists of a flexible piezoelectric film laminated to a polymer substrate. When the sensor is bent or displaced from its neutral axis, the strain within the piezo film generates voltage, up to 70V. A microcontroller can detect this voltage, making the Vibra Tab useful as an inexpensive switch or vibration LDT with Crimps Vibration Sensor/Switch LDT0-028K Piezo Vibration Rev 1 www.meas-spec.com 10/13/2008 1of 4 Piezo Film Sensors High Sensativity AC Coupled Laminated Robust The LDT 0-028K is a flexible component comprising a 28 µm thick piezoelectric PVDF polymer film with screen-printed Ag-ink electrodes, laminated to a 0.125 mm polyester Measurement Specialties Inc Piezo Film Sensors Technical Manual www.msiusa.com [6] Dargahi J, Parameswaran M and Payandeh S 2000 A micromachined piezoelectric tactile sensor for an endoscopic grasper-theory, fabrication and experiments J. Microelectromech.