DIY Pulse Oximeter – Open Electronics

By Bianchi Gabriele on July 30, 2022

The oximeter is a device that means that you can calculate the proportion of oxygen saturation within the blood primarily based on the quantity of sunshine absorbed. It consists of a photodiode and two LEDs: a pink LED and an infrared LED. To make the measurements, the fingertip is positioned between the photodiode and the LEDs as proven within the following picture. Oxygenated blood absorbs extra infrared gentle whereas deoxygenated blood absorbs extra pink gentle. The processor calculates the ratio between the pink gentle acquired by the photodiode and the infrared gentle over totally different time intervals.


On this challenge we see find out how to make this instrument ranging from its fundamental parts, that’s 2 LEDs and the photodetector. We related the parts as proven within the wiring diagram under. We used an Arduino Professional Mini as a microcontroller and an OLED show to view the information. A 9 Volt battery will energy the circuit.


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