Design Of Portable ECG Signal Processing And Display System

With the progress of human civilization and the rapid development of science and technology,more and more manual labor turns to mental work.As the improvement of people's living standards,combined with the lack of physical exercise,the incidence of cardiovascular disease is increasing year by year.The most effective and intuitive way to diagnose cardiovascular disease is to measure ECG.However,at present people go to the hospital to do ECG only when they perceive obvious heart discomfort,and then symptoms may have disappeared,this time to do ECG,can't fully reflect the heart condition when we were morbidity.At the same time,more and more domestic aging population,cardiovascular disease accounts for a high proportion of the elderly population,and the rate of elderly people smart phone penetration is low.Therefore,to develop a ready-to-wear,home-based,outdoor use of portable ECG signal processing system and a set of home for the elderly,pension agencies with waveform display,transmission,alarm function of the display system has important practical significance and application value.This paper designs and realizes the functional modules of ECG signal processing and display system,it mainly includes three parts: the acquisition of ECG signal,the transmission of ECG data and the display of human-computer interaction.(1)Signal acquisition section,according to the characteristics of AD8232 chip,which is the front end of the single lead ECG signal acquisition,completed the acquisition of ECG by the main control chip.Achieved the switch function by pressing the press 3 seconds button,three acquisition modes were achieved respectively for 3 minutes,10 minutes and 1 hours,and carry out a stable and smooth design to the transformation of these three models,completed the low power,anti-jamming design of the RC522 RF module used to identify user identities.(2)Data transmission section,according to the requirement of ECG signal storage under outdoor conditions,improved and optimized the embedded FAT file system selected by portable ECG monitoring side,designed the structure of establish and delete files in TF card.combined with the data acquisition rate,designed zero packet loss of the TF memory card data.In the OSAL system,the Bluetooth CC2541 slave mode is designed,and the 4 version of the Bluetooth slave communication program is developed,and the data transmission of the three ways were designed in detail.(3)Human-computer interactive display section,completed the design of the WIFI module ESP8266 connected to the server automatically,designed the administrator mode used for human-computer interactive display,completed the functional design of Bluetooth host configuration,connection and disconnect.Using MATLAB to filter the noise of 50 Hz power line interference and baseline drift in ECG signal,then the algorithm is implemented in C language and applied on the human-computer interactive display,and the design of human-computer interface display is completed.The portable ECG signal processing and display system designed in this paper has been applied to some communities and pension agencies.