polarofficial/polar-ble-sdk

Gyroscope frequency?

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zemmyang commented

Platform your question concerns:

  • Android
  • iOS
  • Other
  • Platform is not relevant for this question

Device:

  • Polar OH1
  • Polar Verity Sense
  • Polar H10
  • Polar H9
  • Other
  • Device is not relevant for this question

Description:

(I don't think the platform is relevant, although I am testing on an Android device. I am also using an unofficial Flutter wrapper, but this question seems to be more appropriate here.)

When I try to get the gyroscope data, I'm receiving 1 log entry per second, but the amount of data I get appears to vary between log entry - sometimes it's 130, sometimes it's 55, etc. From the documentation, the freq of the gyroscope is 52Hz. Am I supposed to concatenate the samples together to get the "correct" gyroscope data? If that was the case, shouldn't I still be receiving the same data per second?

ps: If it matters, I'm only shaking/tilting the sensor in my hand slowly as I test it.

jimmyzumthurm commented

Hi @zemmyang ,

The amount of data between each data frame packet varies as samples are compressed using delta compression. The less the sensor is moving, the more samples you will receive with each frame as the device only sends the frame to the client when it is filled with MTU size of data (232 bytes max).

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