Am using PIC16F877A to detect heart rate. The IC TSL230R (Light to frequency converter) will give the output as frequency variations. The light passing through the finger will reach the light sensing part of the IC and it will give the output as frequency variations. But I don't know how to calculate the heart rate from this.
This could work I hooked up some hardware to my scope nows time to get the code to read the heart rate
video not the best but you can see how it changes when you put the monitor on .