After attempting a complex more project, I decided with the time that I have for this project and the skills I have, to keep it simple until I am more advanced in electronics.
So I purchased adafruit’s pulse sensor amped. It’s a plug and play sensor that you can use to detect heart rate.
Of course, I want to make it more complex then just that. I want it to react to something, or do something based on heart rate.
I’m still thinking of something it could do, and how I would do this, but this is basically the beginning of a new concept, which I look forwards to developing.