Last Updated on August 22, 2023 by pg@petergamma.org 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 … Continue reading 19.20 We Suggest for Scientific Purposes to Develop Our Own HRM Device