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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
+---
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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.
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