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Create a Simple Pulse Oximeter with EFM32 Tiny Gecko
Posted January 27, 2015 by Chris
"The theory behind a pulse oximeter is based around a simple principle: Shine red light and an infrared light through a blood-rich part of the body and measure the difference in absorbed light with a photo sensor. Hemoglobin absorbs red and infrared light differently depending on the oxygen saturation level. Based on this, it is possible to calculate the ratio of oxygenated vs. de-oxygenated hemoglobin."
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