Research On 24 Channel Electro Encephalo Gran Acquidstion System Basesd On STM32 And ADS1298

With the advancement of society,people pay more and more attention to the brain research,and many scientists from all over the world regard the 21 st century as the age of brain,which show that people want to find out brain's mystery's eagerly.Recently,China has produced several kind of EEG acquisition equipments in this field.However,there still is a large gap between the Chinese equipments and the foreign ones,further more the core components mainly rely on imports,which makes them more expensive and restricts the domestic study on EEG.Therefore,it is of great practical significance and application value to develop EEG acquisition devices with independent intellectual property rights.Firstly,the research background,significance and research status at home and abroad were analyzed.The working mechanism of EEG acquisition was elaborated.The classification of EEG signals and the use of brain electrodes were pointed out.Finally,this paper put forward the overall design of the system,which focused on the functional requirements and performance requirements of EEG acquisition system.Secondly,under the development environment of Altium Designer Release 10,this paper designed the peripheral circuits of the STM32 microcontroller respectively,which including the power circuit,serial communication circuit,JTAG circuit,and impedance detection circuit;Besides,set up the Peripheral circuit of integrated chip ADS1298 which replaced the discrete components in this article,that including the analog front end section,right leg drive circuit,and signal preprocessing section.Again,in the IAR Embedded Workbench development environment,the STM32 main program,A/D conversion program,serial communication program,SPI program and initialization and register module of ADS1298 were compiled separately;Finally,with the help of the integrated development environment Microsoft Visual Studio,Compiling the program of the upper computer software and its collection and storage process.Finally,this paper conducted a preliminary test in accordance to standard digital JJG1043-2008 national standards GB9706.1 key,while using experimental verification EEG acquisition system feasibility test,results show that the designed 24 channel EEGacquisition system performance is good,and can be used to study rain function and clinical diagnostics.