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Overview

This repository contains a the hardware design (schematic and PCB), and software required to build the open source tympanometer system.

Hardware

The PCB project can be opened using Altium Designer.

Microcontroller code

The code runs on Nordic Semiconductor nRF52832 and can be viewed with Segger Embedded Studio.

Smartphone code

The code is an Android Studio project.

Demo

We have added a MATLAB demo showing how to process the audio and pressure signals recorded by the system and output a tympanogram.

These scripts were originally run on:

  • Ubuntu 18.04.5
  • MATLAB R2021a

The programs should be able to run even if the versions do not exactly match.

No non-standard hardware is required to run these programs.

Programs

Running this programs will generate the tympanogram for a sample tympanometry measurement.

  • demo.m: This file processes the acoustic and pressure data recorded by the system to produce a tympanogram.

Data:

  • mout.txt: Audio recording from smartphone.
  • pout.txt: Pressure sensor recording from microcontroller.
  • sout.txt: Timestamp recording from smartphone.

Instructions to run demo

Run 'demo.m' in MATLAB

Runtime: 1.019325 seconds

The output is the following figure.

The first subplot shows the the band-passed acoustic signal, and the points of maximum and minimum air pressure in the ear. The second subplot shows the resultant tympanogram as well as the ear canal volume, admittance, and peak pressure values.

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