basic pulse sensor

https://pulsesensor.com/pages/installing-our-playground-for-pulsesensor-arduino
https://pulsesensor.com/pages/code-and-guide
https://pulsesensor.com/pages/getting-advanced

processing

https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer

Pulse Sensor Schematic
https://www.eecs.yorku.ca/~jr/res/m/MD/PulseSensor.pdf 

Basic and Fundamental

https://www.electroschematics.com/heart-rate-sensor/ 

https://wiki.analog.com/university/courses/alm1k/alm-lab-heart-rate-mon

https://www.rohm.com/electronics-basics/sensor/pulse-sensor

Pulse sensor basic work principals

https://www.elprocus.com/heartbeat-sensor-working-application/

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