M. BindhammerThe current heart beat monitor works quite well, but a pulse oximeter would be better to get the pulse rate and the saturation of peripheral oxygen SpO2.
After a lot of research I found this promising reflective pulse oximeter design. The circuit outputs amongst other things directly the peak IR and red light voltages. The simple equation
is used, and S represents the value of StO2 in a calibration table.
I will use a commercially available pulse oximeter to approximate a function of the saturation of peripheral oxygen depending on S.
Redrawn and slightly modified schematic:
Next step will be to build a prototype and see how it works.
PCB layout of the prototype:
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Hello, I have build the same pulse oximetry circuit on proteus with photodiode (BPV10NF), I do get a signal at point out but get nothing on peak detector, could someone help why is that case?
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