I’m developing an app to retrieve PPG information from Samsung Galaxy Watch 4. I noticed HR RAW sensor (com.samsung.sensor.hr_raw) generates data at 25 Hz and each data point is an array of 16 floating values.
What do each of those 16 values represent and what king of filtering or post processing should I perform in order to retrieve the PPG information?
There is also PPG Batch sensor (com.samsung.sensor.ppg_batch). However, when I’m trying to retrieve the data from this sensor no data is generated. What is the purpose of this sensor and how do I retrieve data from this sensor?
I couldn’t find any documentation on these sensors anywhere.
Appreciate the help.