Wholesale GY-MAX30100 Pulse & SpO2 Sensor Module - High-Sensitivity Heartbeat Detection Board for DIY Projects

The pulse oximeter measures the oxygen saturation in the blood flow. Since oxygen saturation can reflect early medical issues such as those in the heart and lungs, this reading is very useful as a general health monitoring indicator. 
Its working principle is based on the absorption characteristics of hemoglobin in the blood to light. Oxygenated hemoglobin absorbs more infrared light than red light, while deoxygenated hemoglobin absorbs more red light than infrared light. Therefore, the red and infrared LEDs in the blood oxygen meter alternate in emitting light, and the photodiode receives the light signals that have not been absorbed. The ratio of the red and infrared light received by the photodiode is used to calculate the percentage of oxygen in the blood. According to the pulsating characteristics of arterial blood flow, the pulse rate and intensity are also determined and displayed during the measurement.

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