Low-Cost Portable 4-Channel Wireless EEG Data Acquisition System for BCI Applications

This paper puts forward a low-cost portable 4 channel wireless Electroencephalography (EEG) Acquisition system for brain-computer interface (BCI) applications. Available low-cost systems mostly aim at monitoring EEG at low sampling rates whereas higher data rates are needed for advanced processing such as signal averaging. In this study, 4-channel EEG acquisition system was developed, with maximum achievable sampling rate of 2000 samples/s for each channel is achieved. The proposed design consists of Data Acquisition (DAQ) hardware and remote receiver module. DAQ hardware amplifies and digitizes EEG and transmits it wirelessly. Remote receiver receives the data and displays the trend in real-time on computer screen. Whole system is mounted on a 6.6 cm x 4.9 cm PCB and is successfully tested in three different experiments: (i) Electrocardiography, (ECG) recording, (ii) EEG recording, with eyes closed, to observe alpha band (8-12 Hz), and (iii) EEG recording, to observe Steady State Visually Evoked Potential (SSVEP) responses. Further studies will involve addition of visual stimuli hardware and trigger-marking channel.