Design Of Brainwave Signal Acquisition And Processing System Based On Bluetooth Low Energy

With the continuous improvement of human living standards,humankind has paid more and more attention to health and intelligent control.The brain,as the most mysterious part of the human body,contains a wealth of human information.Brain science has become a research hotspot in the 21st century,and brain-computer interface technology is one of the important branches of brain research.The research of BCI technology needs high-quality EEG signals.Therefore,how to acquire high-quality EEG signals has become an important foundation for BCI technology development.Based on the characteristics of human EEG signals and the shortcomings of the today's EEG acquisition equipment,this paper combines signal processing technology,embedded technology and Bluetooth technology,designs and develops a brainwave si-gnal acquisition and processing system based on Bluetooth low energy.The system includes two modules:data acquisition and transmission and data reception:The data acquisition and sending module collects human brain electrical signal through front-end electrodes,and amplifies and analog-digital conversion the collected EEG signals through ADS 1299,and then the controller CC2650 passes data to data receiving module through BLE communication method;the data receiving module receives data through BLE,and the data is transmitted to computer via USB to serial chip,and store and processes the data on the computer at the end.This article completed the hardware design of each module of the system,completed the firmware development and application development based on Bluetooth protocol stack using C language;finally,completed the acquisition experiment of spontaneous EEG signals and induced EEG signals,and completed the accuracy test of the collected EEG signals.The fast Fourier transform of the collected EEG signals was performed by Matlab.The spectrum of spontaneous EEG signals showed that the experimenter produced a clear alpha wave in the closed state of the eyes;the spectrum of induced EEG signal produced a 15Hz induced brain stimulated by the LED.Therefore,the system designed in this paper can collect higher quality brain electricity data and meet the design requirements.