Contributions:OpenBCISource
OpenBCISource
Function
The OpenBCISource filter acquires data from a OpenBCI wireless (Bluetooth) Arduino. The OpenBCI is a low-cost, high-quality biosensing hardware for brain computer interfacing. This arduino compatible biosensing board provides high resolution imaging and recording of EMG, ECG, and EEG signals. This device has been used by researchers, makers, and hobbyists in over 60+ countries as brain computer interfaces to power machines and map brain activity. OpenBCI allows anyone interested in biosensing and neurofeedback to purchase high quality equipment at affordable prices.
More information on OpenBCI can be found at: [1]
OpenBCI Hardware
Either up to 8 referential EEG/ExG channels (with either passive or active electrodes) or up to 16 EEG/ExG referential channels in daisy mode can be inputs. There are built-in 3-axis acceleration sensor with 3 separate channels (x, y, z).
More on hardware can be found at: [2].
Installation
No software needs to be installed. Just plug in the bluetooth dangle.
Parameters:OpenBCISource
Parameters common to all source modules are described under User Reference:DataIOFilter. In addition, the OpenBCISource provides the following parameters:
SourceCh
The total number of channels: EEG.
SampleBlockSize
Samples per channel per digitized block. Together with the sampling rate, this parameter determines how often per second data are collected, processed, and feedback is updated. For example, at 500 Hz sampling and a SampleBlockSize of 20, the system (e.g., source signal display, signal processing, and stimulus presentation) will be updated 25 times per second. For OpenBCI Cyton the sampling rate is 250Hz and it sends data to buffer every half second. So the suggest value for sample bock size is 125.
SamplingRate
The sample rate of the system. All data is either acquired at 250Hz In case you are experiencing problems by higher sampling rates (e.g., data loss, jerky display, etc.), increase the SampleBlockSize so that you are updating the system less frequently (usually, updating the system 20-30 times per second is sufficient for most applications), and increase Visualize->VisualizeSourceDecimation. This parameter will decrease the number of samples per second that are actually drawn in the Source display.
SourceChGain
Gain for each channel.
SourceChOffset
Offset for each channel.
ChannelNames
Names of each channel.
PortName
The port name is depend on where the user plug in the Bluetooth dangle. One the experimenter plugs in the dangle, he can check the port name from Device and Printer on Windows.