| The global aging of population brought challenges to scarce social medical resources. In order to alleviate the health care demand of people, especially for the rehabilitation patients and the aged, this paper designed a multiple physical parameters monitoring system which will reduce the doctor’s work by realizing the continuous real-time health detection of patients and natural intuitive interpersonal interaction.Based on the analysis of Body Sensor Network(BSN), a human health monitor system has been designed using electronic and computer technology, wireless communication technology and intelligent signal processing technology. The system combines Android APP with hardware to monitor physical parameters. It uses ECG electrodes, blood oxygen saturation sensor and temperature sensor to collect body’s physical parameters. It connects several physical parameters detecting nodes with Android mobile smart terminal via Bluetooth 4.0 low energy technology to form a star topology which contain a master node and multiple slave nodes. The physical parameter data will be transmitted to Android mobile terminal and will be processed, displayed and stored in time.This paper describes the principles and methods of ECG signal and blood oxygen saturation detection in detail. In order to meet the requirements of the portable monitoring, single lead system is adopted to detect ECG signal. What’s more, to reduce the effects on people’s daily activities during blood oxygen saturation monitoring, reflection type design was used, which is different from traditional transmission type measurement method. It is able to measure blood oxygen saturation in multiple parts of body and has better flexibility. To solve the problem of large diversity and unstable in individual photoplethysmography in reflection type, this paper designed a more applicable algorithm in oxygen saturation calculation. In the algorithm, detecting threshold was obtained by adaptive learning and the test results show its feasibility. In view of the shortage of traditional Fourier transform processing the time-varying signal, wavelet transform was studied in application of denoising the pulse wave signal and the ECG signal. This paper analyzed the structure of protocol stack of Bluetooth low energy power, especially the functions of GAP and GATT lays which are related closely with BLE development. In addition, settings of crucial parameters related with power consumption are studied. With these analysis, this paper designed several Bluetooth 4.0 communication modules based on CC2540 chips, including body temperature monitoring module, blood oxygen saturation monitoring module and ECG monitoring module. This paper program to achieve the BLE connection and data interaction in various modules and the Android mobile terminal. Take Android mobile terminal as the gateway node of BSN, this paper introduced the main functions and specific steps of the achievement of BLE in Android platform and finally designed Android client application which consist of BLE communication module, data denosing module, ECG drawing module and so on. At last, communication distance, transmission rate, power consumption and accuracy were tested to verify the feasibility of the system.This system mainly realizes three functions as follows: data collection of physical parameters, such as ECG, pulse, blood oxygen saturation and temperature; data communication in BSN system; the processing, display and storage of these signal on Android platform. The system is flexible, easy to operate, low power consumption and low cost etc., which can satisfy users’ real-time health monitoring in home environment. It has a very vital significance in home health care and disease prevention, medical cost reduction, ease tension relief of social medical resources. |
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