How to access Android Heart Rate Sensor RAW DATA? (reflected light, not the heart beat)

Question

The android sdk on heart rate sensor only returns the calculated bpm which I have no interest.

I need to access to android heart rate sensor RAW data, e.g. in terms of

Answer 1

This question is old, but for Samsung device you can access raw heart rate sensor like red signal or ir signal (Note 4, Note 5, S6, S7), please check Sensor Extension http://developer.samsung.com/galaxy/sensor-extension.