A photoresistor can sense the subtle changes in light intensity caused by your blood to detect your heartbeat!
Project tutorial by 3 developers
A heart rate monitoring system that tracks your heart beat in "BMP" but I made a little difference by adding some LabView Visualisations.
Project tutorial by HRMS
A voltage to frequency converter can realize an opto-isolated analog input for Arduino or other microcontroller systems.
Project tutorial by Giovanni Carrera
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