As it turns out, nowadays you can make your own fingertip pulse oximeter using an Arduino microcontroller and an appropriate pulse oximeter sensor module. There’s nothing to be afraid of, so go ahead ...

A pulse oximeter measures both your pulse and the oxygen saturation in your blood. You’ve probably had one of these on your finger or earlobe at the doctor’s office or a hospital.

Using a Pi Pico W for the brains, [Rasic]’s device can record, store and analyze the data from an arm cuff, stethoscope, electrocardiograph (ECG), and pulse oximeter.

Pulse oximetry can estimate the levels of oxygen in your blood. Find out how a pulse oximetry test works, what it's used for, and what the readings mean.