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8 changes: 8 additions & 0 deletions 1209/5252/index.md
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---
layout: pid
title: PSK-X20 PPG Waveform Sensor
owner: PskOnline
license: MIT
site: https://www.psk-online.ru/
source: https://github.com/adadurov/PskOnline.X20.Firmware
---
6 changes: 6 additions & 0 deletions org/PskOnline/index.md
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---
layout: org
title: PskOnline
site: https://www.psk-online.ru/
---
We are a small team striving to improve reliability of professional activities of humans operating large and dangerous facilities like power plants, electrical grids and the like. We create our own open-source PPG waveform sensor with USB interface to estimate the stress levels using the methods based on HRV analysis.