Arduino Library for the HRS3300 Heartrate sensor for the nRF52 Bluetooth Micro
It includes a closed source .a file, to get the Arduino IDE recognize it you need to edit the Platform.txt from the nRF52 library.
Add: compiler.libraries.ldflags=
somewhere as a new line.
also add: {compiler.libraries.ldflags}
somewhere ad the end of line combine.pattern
For more infos watch this video for another Heartrate Sensor:
Demo video: