It is currently specialized for the Zephyr HxM Bluetooth monitor (not the more recent Zephyr HxM Smart version), but it is designed to easily integrate other sources in the future, as long as they can report R-R intervals in near-real-time. It can either print a new line for each beat received in the command-line, or act as a local web server for its browser-based GUI.
The initial version will be coming here shortly. It alreasy has all the features a layperson would expect from variability biofeedback software:
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Display battery charge and current average BPM every second;
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CLI: Display instantaneous BPM visually every second, making the terminal graph a history over time;
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Both: Display a 14-band Power Spectral Density of the last 30 seconds of data, to visualize VLF, LF and HF variability;
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GUI: Display a graph of the recent heart rate fluctuations.
As-is, the tool is already very usable for cardiac coherence biofeedback, for noticing ectopic beats (extrasystoles) and quantitatively monitoring sports recovery status.
I hope to build this tool up from there to be able to detect fluctuations in PSNS vs SNS activity (i.e. whole-body stress level) via PSD and instantaneous BPM observations, to set thresholds to alert of stress levels requiring attention. (Perhaps a WebKit Notification, or some form of beeping, or simply making something big and RED appear / flash.)
