[rahimnathwani]

"I can put a finger on my wrist and feel every beat perfectly

Right, but probably only when you're stationary. Try taking your own probably when you're walking or typing.

[founderling]

In fact, I only want to use it at home while sitting in front of the computer. I want to make some biofeedback experiments to figure out if I can influence my heart rate via meditation.

[wnkrshm]

Maybe this [0] could be of interest to you as well then.

[0] https://github.com/giladoved/webcam-heart-rate-monitor