Bangle.js 2 Cutting Edge - new heart rate algorithm

{ "vcPPG": 1419, "vcPPGoffs": 0, "isWearing": true, "adjusted": false,
  "vcPre": [ 4, 0 ],
  "vcPS": 15,
  "vcEnv": [ 0, 0, 0 ],
  "vcIRQ": 4,
  "vcRaw": new Uint8Array([0, 4, 130, 4, 0, 15, 5, 128, 224, 87, 55, 103]).buffer,
  "raw": 2838, "bpm": 60, "confidence": 80, "filt": -26624, "avg": 2929 }

Look at the object from hrm-raw event. I noticed in halemmerich's code that he logs also e.vcPPG. I wonder how this value differs from raw.

I conclude that hrm.raw is the sum of the e.vcPPG and e.vcPPGoffs, then multiplied by 2.

proof:

int v = vcInfo.ppgValue + vcInfo.ppgOffset;
  if (vcType == VC31B_DEVICE)
    v <<= 1; // on VC31B the PPG doesn't vary as much with pulse so try and bulk it up here a bit
hrmCallback(v);