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| Design of a Wearable Device for SpO2 Monitoring Using BLE |
1 Department of Biomedical Engineering, South China University of Technology, Guangzhou 510006, China
2 No. 421 Hospital of PLA, Guangzhou 510318, China
3 Hospital of South China University of Technology, Guangzhou 510640, China |
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Abstract In this paper, we designed a wearable device for oxygen saturation monitoring, which can achieve real-time detection of SpO2. We designed and implemented several key modules, including a clip-on photoelectric sensor, an interface module of solar cell, and a module of bluetooth low energy (BLE). The hardware design used energy efficient components and modules. Monitoring data were transferred to the application of cellphone by BLE technology. The software design adopted an optimized strategy of data transmission. The wearable device has features of low power, wearable, and reliable, and thus is suitable for outdoor activities and oxygen saturation monitoring for hypoxic diseases patients. Test results showed that the final error rate of the bluetooth communication was 0 and the pulse rate was 980%. Most importantly, the accuracy of the oxygen saturation was 979% when the output of simulator was above 75%. Moreover, we also designed a power supply module using solar cell, in which the machine standby current was 11 μA and the battery life at peak power was more than 18 h. The cell performance of our device was better than those of fingertip pulse oximeters.
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