Design of Low Cost Pulse Oximetry Based on Raspberry Pi

Abstract

Pulse Oximetry is a non-invasive method for monitoring blood oxygen saturation. The oxygen saturation in blood is expressed in percentage of saturation of total hemoglobin (SpO2). This method utilizes the different wavelengths of red light (660 nm) and infrared light (940 nm) captured by the light sensor after passing through vessels and capillaries at the tip of the index finger. In this study a red and infrared LED that is directed to the fingertips and light passing through the blood vessels captured by photodiode are utilized. The signal from the photodiode is sent to Raspberry pi and processed to get a percentage of oxygen saturation in the blood. This paper presents the comparability of the produced prototype with the commercial standard equipment. It was also demonstrated that the error accuracy is relatively comparable with commercial one while the price are relatively lower.