| With the growing of people’s health awareness and health care needs, the demand of measuring instrument, which must be accuracy, stability and portability, monitoring pulse, blood pressure, ECG and other physiological parameters of the human body has become increasingly urgent. At present, with the vigorous development of information technology and computer technology, and the emergence of The Fieldbus Control System(FCS) applications and continued success, measurement system which should be ntelligence, information, networking, miniaturization gradually has become the mainstream. Controller Area Network(CAN) which is real data preparation, high stability, outstanding value for money, etc. and which is one of the most promising FCS, has becomed more and more popular in today’s automation applications and other related fields.This paper through researching and comparing the system consisting of integrated circuits and the system consisting of modular, has found that the latter system when it need to maintain and upgrade, can provide greater convenience and save more manpower and resources. In view of this, we design a modular based on CAN bus physiological parameter measurement system. This system builts in CAN bus controller which STM8S208 MB as core controller of each node, using Lab VIEW to compile interactive interface, the measurement data use CAN to transfer to the system through the master node, the master node via a USB port to upload first bit machine for display and storage. In this paper, we apply this system to obtain and display the human body temperature and pulse data, to the obtained pulse wave data, we also analyze it, using wavelet threshold method changes and the pulse signal de-noising and feature extraction values, and finally calculate the pulse rate. Experimental results show that the measuring system with high accuracy and stability, can be used as an auxiliary medical measuring instruments, that provide a strong draw on CAN applications medical devices. |
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