AttysHRV

An immersive heartrate variability (HRV) biofeedback app for the Oculus Quest 2 and the Attys to de-stress.

The app turns the heartrate into a seaside animation where the idea is that a relaxed person has a regular physiological heartrate variability which creates large regular waves in the animation. The person can use deep breathing to create these and in turn relax.

The high precision bioamplifier Attys is used to record the ECG in realtime and the Oculus then detects with high precision the heartbeats and calculates the heartrate.

The app is written in C++ using the openXR / openGL framework which allows realtime processing and animation of the ECG in the headset.

Prerequisites

1. Change into AttysHRV/app/src/main/cpp and clone the IIR filter library and the spline interpolation library:

git clone https://github.com/berndporr/iir1.git
git clone https://github.com/berndporr/cxx-spline.git

2. Download the Oculus openXR API, create a subdirectory ovr_openxr_mobile_sdk and unzip the contents of the openxr SDK into it.

   Edit app/src/main/cpp/CMakeLists.txt and point it to the openXR API: set(OCULUS_OPENXR_MOBILE_SDK /home/yourname/ovr_openxr_mobile_sdk)

3. Clone AttysComm and modify app/build.gradle so that it points to AttysComm.

Compile & run

Start Android Studio, open AttysHRV and click run.

How to use the app

https://www.attys.tech/attyshrv/