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.

and higher durability. .Manufacturers are increasingly developing waterproof and dust-resistant MEMS microphones for rugged and outdoor applications. .North America – Strong presence of consumer ...

The sensing device is a MEMS microphone that outputs a pulse density modulated (PDM) signal. There are chips available to directly interface such a microphone to a USB port, but [Mahesh] found ...