ttpphd, Open Earable
https://open-earable.teco.edu/
OpenEarable is a new, open-source, #Arduino-based platform for ear-based sensing applications. It supports a series of sensors and actuators: a 9-axis inertial measurement unit, an ear canal pressure and temperature sensor, an inward facing ultrasound microphone as well as a speaker, a push button, and a controllable LED.