Hi in this video I connect a pulse rate sensor https://pulsesensor.com/ to get my pulse rate fed into unreal via an old Arduino 2560 and the excellent Serial communication plugin courtesy of Ramiros Lab - GitHub - videofeedback/Unreal_Engine_SerialCOM_Plugin: Serial Com Port Library for Unreal Engine 4 and Unreal Engine 5
The reading is read from a serial print command in Arduino and picked up via the plugin and updated every second on screen, a simple tutorial for intermediate ue4 users.
Let me know if you have any questions !
https://dev.epicgames.com/community/learning/tutorials/O2Ml/unreal-engine-read-your-pulse-during-gameplay