feat(ecg-app): high-pass filter and pulse detection

fuchsi* requested to merge fuchsi/firmware:master into master

the high-pass filter (simply subtracting a moving exponential average) improves the clarity of the graph significantly by eliminating much of the muscle movement etc. that is visible otherwise.

detect_pulse uses this cleaner signal to detect the Q and R spike of the QRS complex to determine the pulse of the user

Edited by fuchsi*

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