Resonant Cantilever by [Pcflet01], CC BY-SA 3.0 MEMS have a wide range of applications including ink jet printers, accelerometers, gyroscopes, microphones ... is a rigid structure, often a ...

Deciding to go for a full digital design for the circuitry, the peripheral is based off of a MEMS microphone and an STM32 microcontroller doing the heavy lifting between it and a USB connection.