Problem connecting Neurosky and Matlab.

    %Clear Screen
    clc;
    %Clear Variables
    clear all;
    %Close figures
    close all; 

    %Preallocate buffer
    data_att = zeros(1,256);    

    %Comport Selection
    portnum1 = 3;  
    %COM Port #
    comPortName1 = sprintf('\\\\.\\COM%d', portnum1);

    % Baud rate for use with TG_Connect() and TG_SetBaudrate().
    TG_BAUD_115200  =   115200;

    % Data format for use with TG_Connect() and TG_SetDataFormat().
    TG_STREAM_PACKETS =     0;
    % Data type that can be requested from TG_GetValue().

    TG_DATA_ATTENTION = 2;

    %load thinkgear dll
    loadlibrary('Thinkgear.dll');

    %To display in Command Window
    fprintf('Thinkgear.dll loaded\n');

    %get dll version
    dllVersion = calllib('Thinkgear', 'TG_GetDriverVersion');

    %To display in command window
    fprintf('ThinkGear DLL version: %d\n', dllVersion );

    % Get a connection ID handle to ThinkGear
    connectionId1 = calllib('Thinkgear', 'TG_GetNewConnectionId');
    if ( connectionId1 < 0 )
        error( sprintf( 'ERROR: TG_GetNewConnectionId() returned %d.\n', connectionId1 ) );
    end;

    % Attempt to connect the connection ID handle to serial port "COM3"
    errCode = calllib('Thinkgear', 'TG_Connect',  connectionId1,comPortName1,TG_BAUD_115200,TG_STREAM_PACKETS );
    if ( errCode < 0 )
        error( sprintf( 'ERROR: TG_Connect() returned %d.\n', errCode ) );
    end

    fprintf( 'Connected.  Reading Packets...\n' );

    i=0;
    j=0;

    %To display in Command Window

    disp('Reading Brainwaves');

    figure;
    while i < 40
        if (calllib('Thinkgear','TG_ReadPackets',connectionId1,1) == 1)   %if a packet was read...
            if (calllib('Thinkgear','TG_GetValueStatus',connectionId1,TG_DATA_ATTENTION ) ~= 0) 
                j = j + 1;
                i = i + 1;
                %Read attention Valus from thinkgear packets
                data_att(j) = calllib('Thinkgear','TG_GetValue',connectionId1,TG_DATA_ATTENTION );
                %To display in Command Window
                disp(data_att(j));
                %Plot Graph
                plot(data_att);

                title('Attention');
                %Delay to display graph
                pause(1);
            end
       end
    end

    %To display in Command Window
    disp('Loop Completed')
    %Release the comm port
    calllib('Thinkgear', 'TG_FreeConnection', connectionId1 );

I would like to use this source code to collect the raw data but it gives an error.

> In loadlibrary
  In Ex_Attention (line 27) 
Thinkgear.dll loaded
ThinkGear DLL version: 22
ERROR: TG_Connect() returned -2.

How can I fix it?

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/277429-i-am-using-mindwave-mobile-have-problem-to-data-acquition-in-matlab