NI 6008 digital output

Hello all :) I have a National Instruments NI-DAQ USB 6008. I have the data acquisition toolbox, and I've used this device to capture and analyze analog inputs. Now, I would like to use it for digital outputs. In the simplest terms, I'm just writing a function that will set one of its digital outputs to high or low. Can somebody please explain to me the functions/code that I need to accomplish this? I'm having trouble finding the information.

Thanks! plz post the whole code :) Mulham

Answer 1

[Hari]

Hi,

I understand that you’re trying to use your NI USB-6008 device with MATLAB to perform simple digital output operations, such as setting a pin to high or low, using the Data Acquisition Toolbox.

I assume that you've already installed the necessary NI-DAQmx drivers and that your NI USB-6008 is detected in MATLAB when you run daq.getDevices.

In order to write a digital output (set a line to high or low), you can follow the below steps:

Step 1: Create a DataAcquisition object

You first create a daq session (or DataAcquisition object if using newer MATLAB versions).

Step 2: Add a digital output line

Add the line (e.g., port0/line0) as a digital output to your session.

Step 3: Write a logical value to the line

You use the write function to set the line to true (1) for high or false (0) for low.

Step 4: Full Example Code

Here is the complete code to set port0/line0 high, then low after 1 second:

% Step 1: Create DAQ session

dq = daq("ni");

% Step 2: Add digital output channel (use correct device ID, e.g., "Dev1")

dq.addoutput("Dev1", "port0/line0", "Digital");

% Step 3: Set line HIGH

write(dq, true);   % or write(dq, 1);

pause(1);          % wait for 1 second

% Step 4: Set line LOW

write(dq, false);  % or write(dq, 0);

You can repeat the write command any number of times to toggle the pin.

References:

https://www.mathworks.com/help/daq/ref/daq.html

https://www.mathworks.com/help/daq/ref/addoutput.html

https://www.mathworks.com/help/daq/ref/write.html

Hope this helps!