Last Updated on September 5, 2022 by pg@petergamma.org
https://www.sciencedirect.com/science/article/pii/S2405844021012512
Conclusion of the paper:
“With proper background knowledge regarding ECG principles and a small degree of set-up complexity, an open source cyton board can be created and employed to perform multimodal HRV assessments at a fraction of the cost (~4%) of an industry-standard ECG setup“.
see also here: