This project was created before VRChat has release OSC.
So you should use OSC instead.
But you can still check this to know how to communicate with BLE Heart Rate devices.
Maybe someday I will switch the method to OSC-based.
This mod can let VRChat show your heart rate via BLE heart rate monitor.
Before use this mod, make sure your PC support Bluetooth Low Enegy, and have a BLE heart rate monitor device.
This mod rely on MelonLoader you need to install it first. Then put VRCHeartRate.dll in Mods folder.
Open up VRCHeartRate.unitypackage you will get these files
Drag HeartRateMonitor into your avatar, adjust it's transform as your wish.
If you want this monitor follow some part of your avatar, drag Digit_bone into that Bone.
You can also add material to model to make it looking good.
Add a parameter to VRC Expression parameter called HeartRate, also add this parameter to your avatar's FX layer's controller.
Add two layers in that controller like this
Then upload your avatar and lunch the game.
Enjoy~
using VRCFaceTracking's ParamLib.
It's a cool project, go check it!