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  • It's hard to explain - just tried putting them side-by-side for a video but if I put them both on my wrist the performance depends on which order they're in.

    Here are two screenshots...

    • Red is the filtered value (which is then peak detected)
    • Purple is the raw HRM value (with DC bias removed)
    • Green is the raw value from the HRM

    The one on the right is the new VC31B. The actual signal varies less with heart rate, but it's much 'cleaner' - I believe the sensor itself probably has a higher dynamic range.

    I run the new one at 25Hz rather than the old one's 50Hz as well, which helps with power consumption. Even at half the rate it seems to perform slightly better


    2 Attachments

    • hrm_vc31.png
    • hrm_vc31b.png
  • I run the new one at 25Hz rather than the old one's 50Hz as well,

    Hmm. That should be fine for counting BPM, but other metrics will probably require a higher sampling rate. What is the range of tge sensor? In theory, could apps request a higher sampling rate for specific purposes?

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