This a set of scripts used for extracting and analyzing (mainly HRV) photoplethysmograph samples using the PulseSensor connected to an Arduino, while running their serial script found here.
For the script to get the samples through serial, the script must be set in mode PROCESSING_VISUALIZER instead of SERIAL_PLOTTER.
By default, the serial port dev/ttyACM0 is used, but you can change the variable port in take-sample.py.
An example (16.000 bytes) csv file outputted by the script can be found on samples/example.csv.
Note that for the moment, the time column outputted in the samples is generated on the go by local CPU time, which I'm not sure is optimal at all for HRV calculation.
Two libraries are used for HRV calculation, heartpy and hrvanalysis (which uses heartpy's intervals).