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System configuration using microcontroller. 2nd LPF: second low-pass filter, HPF: high-pass filter, 60 Hz IIR notch filter: removal of 60 Hz power line with infinite impulse response, BPF FIR filter: band-pass filter finite impulse response filter, Ave filter: averaging filter, 1st, 2nd, 3rd, and 4th derivative: the order of the derivative of the photoplethysmogram waveform.
