Heart Rate Monitor with Android App APK and Cloud upload.
Maxim MAX32630FTHR is supported by mbed. You will find the code for this project at the following link: https://os.mbed.com/users/Brakkion/code/BLEHeartRateMon/
Mouser project BOM can be be found at the following link: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5a188ef16f
Mouser project article can be found at the following link: https://resources.mouser.com/hardware-projects/creating-a-wearable-heart-rate-monitor