Questions about PPG data

[travelmail26]

I have a few questions about the PPG data.

1)
In the streaming data, I see 4 values: what are they, in order? There's three in the csv: IR, RED, and Ambient

2)
In your experience, when there is a good fit, what is the typical range of IR and RED? When I graph the values, I see peaks of RED around 60,000. IR oscillates around 2.5. Are there any values that indicate a bad fit or interference?

3)
Have you found a practical application for the Ambient value? I'm not sure what it is.

Thanks again for a great application!

[James]

As per the CSV header, the streaming values are IR, RED and Ambient.

The Interaxon SDK docs on this are a little weird:

The AMBIENT enum value is repurposed on models after Muse2 2018.
Muse2 2018 AMBIENT represents the Ambient value.
MuseS 2019 AMBIENT represents the Green value. There is no Ambient available and Red is not used.
MuseS 2021 AMBIENT represents the IR-H16 value. There is no Ambient available.
Raw PPG values are given in microamps.

I have not figured out the PPG data yet, which is why it's hidden! Sorry!