Labjack U3-HV with matlab for LED blinking continously

Hi,

Could you please tell me the very first few lines of code that I would need to write in MATLAB, in order to connect to labjack U3-HV, through USB cable.

I have tried downloading your MATLAB library and following some instructions that you have on your website, but I was not successful at all in even performing a handshake with a device. Can i have the coding for analog input in LED blinking continously using the labjack U3-HV as hardware tools?

Thank You!

Answer 1

[Sivapriya Srinivasan]

Hello,

I understand that to connect to a LabJack U3-HV device and perform an analog input operation, you can use the following MATLAB code as a starting point:

% Load the LabJack library
ljud_LoadDriver;  % Make sure the LabJack driver is loaded

% Open the LabJack U3-HV device
[ljhandle, ljerror] = ljud_OpenLabJack(ljdtU3, LJSocketType.USB, '1', 1);

% Check for errors in opening the device
if ljerror ~= 0
    error(['Error opening LabJack U3-HV: ', num2str(ljerror)]);
end

% Configure the analog input channel
channel = 0;  % Analog input channel number
range = LJ_rgBIP10V;  % Analog input range (-10V to +10V)
resolution = 0;  % Default resolution
settlingTime = 0;  % Default settling time
ljud_AddRequest(ljhandle, LJ_ioPUT_CONFIG, LJ_chAIN_RESOLUTION, resolution, 0, 0);
ljud_AddRequest(ljhandle, LJ_ioPUT_AIN_RANGE, channel, range, 0, 0);
ljud_AddRequest(ljhandle, LJ_ioPUT_CONFIG, LJ_chAIN settlingTime, 0, 0, 0);

% Start continuous LED blinking
while true
    % Read analog input value
    ljud_eGet(ljhandle, LJ_ioGET_AIN, channel, 0, 0, 0);
    [ljerror, voltage] = ljud_GetResult(ljhandle, LJ_ioGET_AIN, channel, 0);
    
    % Check for errors in reading the analog input
    if ljerror ~= 0
        error(['Error reading analog input: ', num2str(ljerror)]);
    end
    
    % Perform some operation based on the analog input value
    % For example, if voltage is above a threshold, blink an LED
    if voltage > threshold
        % Blink LED
        % Write your code here to control the LED using your hardware setup
    end
end

% Close the LabJack U3-HV device
ljud_Close(ljhandle);

Make sure you have downloaded and installed the LabJack MATLAB library from the official LabJack website (https://labjack.com/support/software/examples/ud/matlab) before running this code. Additionally, you may need to modify the code to match your specific hardware setup and requirements.

Please note that this code only provides a basic framework for analog input and LED control using the LabJack U3-HV device. You will need to adapt it according to your specific needs and hardware configuration.

Please refer to LabJackU3 - File Exchange - MATLAB Central (mathworks.com) for further assistance

Hope this helps!