for ECG based on OpenBCI: For optical heart rate sensors, based on multiple DF Robot modules: and HeartPy for noise reduction: https://scholar.google.com/citations?user=OOhuA6gAAAAJ&hl=de&oi=sra Optical heart rate monitors and chest straps are coming closer to the most accurate ECG devices, as far as accuracy is concerned: We are convinced it is worth to build our own device …
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