In order to realize real-time continuous detection of oxygen saturation in a dynamic environment

and a blood oxygen saturation monitoring device based on the transmission-type detection principle is developed.Photoplethysmography is collected by transmissive optical frequency converter

low-power consumption microcontroller MSP430 is used as main controller chip

the obtained pulse wave signal is processed by program

and then sent to the terminal device through the Bluetooth module. There are several interference pulse wave signal in dynamic environment

use up and down envelope informations of pulse wave signal

adopts neighbor value substitution method to remove singularity point

use low-pass filtering to remove the high frequency interference

and the morphological filter to remove interference of the baseline drift and the motion artifacts The device has the characteristics of low cost

low power consumption and easy operation. Experimental results show that the obtained oxygen saturation has good precision and can dynamicly and real-time monitor.