Gravity Piezo Film Vibration Sensor for Arduino - 

Simple sensor that uses piezo film to detect vibration, impact and touch. The film comprises a 28µm thick piezoelectric PVDF polymer with screen-printed Ag-ink electrodes, laminated and fitted with two crimped contacts. As the piezo film is displaced from the mechanical neutral axis and bending creates very high strain within the piezo polymer, high voltages (about ±90V) are generated. When the assembly is deflected by direct contact, the device acts as a flexible switch, and the generated output is sufficient to trigger MOSFET or CMOS stages directly.