4 layers73.3 × 74.4 mm

Piezo sensing
Markvsid/Piezo_sensing
Exploratory project using piezoelectric contact sensor to attempt to extract footstep count, breathing, and heartbeat. 4 layer stm32H7 PCB with analog charge amplifier front end.
105 parts
Open-source boards designed in KiCad by Markvsid on GitHub, from 1 repository. A board’s address here is its repository’s there.

Markvsid/Piezo_sensing
Exploratory project using piezoelectric contact sensor to attempt to extract footstep count, breathing, and heartbeat. 4 layer stm32H7 PCB with analog charge amplifier front end.