Design and Implementation of Wireless Motion Sensor Node System

Abstract

Smart wearable devices have emerged in response to the situation, providing a new method for people's health monitoring. Three kinds of intelligent sensors have been selected to adopt the modular optimization design idea, and the wireless motion sensor node system and data display interface have been designed, which can collect and record heart rate, body temperature, movement steps and other information in real time and effectively. Based on ADS1292 analog front-end chip design ECG detection circuit, through the difference threshold method to improve detection accuracy, complete real-time collection and recording of user's heart rate, achieve dynamic ECG test and display, analysis and calculation of user's heart rate, the error is not more than 5%. Push-pull LMT70 temperature sensor is used to measure the body temperature, which increases the carrying capacity and keeps the sampling rate no less than 10 times/min. Three high-resolution ADXL355 acceleration sensors are added, and the interval sampling method is adopted to calculate the number of moving steps and moving distance, and the error is kept less than 5%. At the same time, the wireless motion sensor node has the function of surfing the Internet and transmitting data to the server to complete the data operation. After debugging and analysis for many times, the system has reached the design requirements, and has the advantages of low cost, high precision, easy to use and low power consumption.