Sending/Receiving Signals using DAQ

I'm new to Labview and having some difficulties. I'm looking for some simple examples or tutorials that will take me through the process of sending and receiving both analog and digital I/O's. I've read through the user manual and searched on-line but haven't been able to locate anything very simple. I'm looking along the lines of creating a simple light switch. Any help or advice will be greatly appreciated.
Thanks

Couple of questions for you -
What multifunction daq board are you using?
What version of LabVIEW?
What operating system?
Basically, the best examples that you're going to find will be in the LabVIEW Example Finder. You can find this by opening LabVIEW and then clicking on Help >> Find Examples... The shipping examples with LabVIEW are very extensive and in depth, but they are more vertical meaning that you probably wouldn't find any that did both AI and DIO at the same time.
To find examples such as AI and DIO at the same time, or at least AI and DO at the same time, you will want to search through the example code library. If you give me some more informa
tion, I might be able to help you find something if you are not able to.
Jared A

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How can I play an audio signal using DAQ or other way?

I'm designing a Voltage control amplifier. as shown in the attachment, I have a speaker connected to the power amplifier but all i have is noise. I like to know how can I put an simple audio to my circuit. My audio input is generated by the function generator. I only have a simple labview program which control my voltage input as attached.
Attachments:
Untitled.png ‏78 KB
DAQOutputControlVCA.vi ‏45 KB

No problem, your questions are not stupid. I just want to be sure you're digging into the examples and learning from them (they're a great resource).
The sound card outputs should be good enough to drive your circuit. Most cheap cards or built-in audio chips have a jack for line out and headphones (which is just the line signal through a buffer amp so you have volume control). Either on should work for your purpose. The line out should give you a volt or more at reasonable current levels. There also MIGHT be a low frequency filter on the output meaning that you won't be able to output DC levels or very slow (<20Hz) AC.
The jacks themselves usually have the signals (Left and Right) on the center conductors and the return is the barrel but you might want to look up your card's specs or probe the outputs before you connect anything to your circuit.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

How to use scb-68 board to send a trigger signal

I am using Labview 8.5. Our DAQ card is scb-68. I want to send a trigger signal out by using the DAQ. Could anybody tell me how to do that?

There is a program in another computer waiting for the trigger signal. We don't need to worry about that computer.
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Attachments:
trigger4.vi ‏28 KB
diode_scan3.c ‏12 KB

I am trying to log data from 4 voltage input signal using labview, but when i use DAQ assistant i am able to log data from one signal at a time only.

I am trying to log data from 4 voltage input signal using labview, but when i use DAQ assiatant i am able to log data from one signal at a time only.I am trying to get all 4 input data to logged in a single file againt time. I am new to Labview, I need to sample this data within a couple of days can someone help please.

Naveen
Check out the info in the Analog Input section of the document linked below. (Ignore the part about Global Channels.) In Figure 5, notice that you can select multiple channels while holding <Ctrl> or <Shift>.
Developer Zone Tutorial: NI-DAQmx Express VI Tutorial
Kyle B | Product Support Engineer | ni.com/support

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Hi all, I'm hoping you might be able to help me out on this. I have a Linksys router and a WRE. The router does not have wireless, but i was curious if it's possible to trunk the router to the WRE, and have it send out a wireless signal, rather than pick up on and expand an existing signal. If so, what would i have to do to achieve this.
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Will the above has an interference when you want to control the switches?

see here:
http://forums.ni.com/ni/board/message?board.id=250&message.id=20644

How can I set the sampling frequency in Labview if I am not using DAQ?

I am working with bluetooth to send my four signals from my circuit to the computer. So, I am using VISA to acquire the data in labview. Since as you know its not possible to use DAQ while using bluetooth.
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I was wondering If there is a way of making labview recognize the clock-timer as the sampling rate or any other way to set the sampling frequency somewhere before the filters.
here is the program, you can take a look at it.
Attachments:
shift final - Copy.vi ‏363 KB

Sender side is sendng 2 bytes of FF in the begining of the loop and 2 bytes of zeros between each signal, I am attaching the code as ICCV8 file (I will also attach it as a notepad file), so you can see what I mean. I had written some solutions for that as well in my program before but not sure if it was correct or not. I tried to search for FF bytes as a string, after getting each 18 bytes. But apparently it doesnt find the FF, I reckon because of wrong conversions beforehand, so it stops the programm there. Im attaching the that program now as well. could you please take a look?
Attachments:
main.c ‏2 KB
bluetooth code.txt ‏2 KB
ok - Copy.vi ‏159 KB

Subtracting two waveforms, one aquired using DAQ analog voltage input, and the other one being internally generated

Hello NI Community,
I am new to LabView and was hoping someone might be able to help with a question I have. Right now, I am using a DAQ unit to sample an externally generated sinusoid and I would like to alter that signal by adding to it another signal that I could control using the front panel. Whenever I try to just connect the input with something like the sine waveform vi and put a subtraction sign between them it doesn't work (I get an empty waveform graph). To get around this, I have resorted to sending out a signal (through an analog output) and then reading the signal on the Daq, and then finally I add the two together. Doing it that way works, but it wastes two channels and I imagine there is a better way. I have attached my VI, and I labelled the location of interest "Where the Signals Get Subtracted", which is currently shown using the two inputs.
Thanks,
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What a mess. I have no idea where you are trying to do the subtraction. Can you make a very small VI (one whose Block Diagram fits on a single screen) that shows what you are trying to do? Include the Sine Wave Generator, and you can include a "Black Box" that says "From DAQ". But thank you, at least, for posting code, not a picture.
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Bob Schor

New project using Daq Assistant or not ?

Hi everybody,
I need to create a software to do some realtime acquisition & analysis.
I trained myself a little bit on c# lessons to get use to this programming language; I’m also discovering Measurement Studio & Visual Studio. (I’ve background in C++).
My software will have 2 modes :
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Triggered acquisition, signal plotting + signal processing & plotting (fft, , 1/3 octave band filter)
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If I use Daq Assistant ( http://www.ni.com/tutorial/4652/en/ )
I know that the code to create channel is stored in DaqTask.cs
Plotting :
NationalInstruments.AnalogWaveform<double>[] acquiredData = daqTaskComponent1.Read();
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private AnalogWaveform<double> data = new AnalogWaveform<double>(1000);
data = reader.EndReadWaveform(ar);
acquiredDataWaveformGraph.PlotWaveform(data);
Questions :
What is the difference between AnalogWaveform<double> and AnalogWaveform<double>[] ? why it's not the same type ? I need to do some signal processing with this signal, so what type should I use for my application ?
I didn't succeed to configure my 2 modes in daq Assistant (continuous and triggered acquisition) is it possible or should I create 2 Items in my solution, one for continuous acquisition and on for triggered acquisition ?
Kind regards,

Check out the downloads section of iLounge.com. There are a handful or two of applications that will help you transfer songs from the iPod to the computer.
Another option is to network the two computers together and transfer the iTunes folder to the new Mac. All you need is an ethernet cable and to turn on file sharing in the Sharing preference panel. Depending on how old your "older" Mac is, you might need a crossover ethernet cable.
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Hi,
I am new to LabVIEW. I have been assigned a project in which i have to display two analog signals from an analog potentiostat i.e. voltage and current (also a voltage signal) on a graph using labview. I am using a myDAQ device to acquire these analog signals and I am using labview 2013 to display these signals on a graph. I am using DAQ assistant to configure these signals. Rightnow I have separate graphs for each channel. However, I want a single XY graph to display one voltage as a function of the other i.e. I want to have voltage on the X-axis and current output on the Y axis. Any kind of help is greatly appreciated.
I have attached a screenshot of the VI. that I have made.
Regards,
Max
Attachments:
New Microsoft Word Document (2).docx ‏32 KB

Thanks for the quick response. I was able to make a X-Y graph. However, I can only see a dot floating around. It's not drawing anything. I want to see it making a plot as it collects data. Also, I want to see the complete waveform formed when I stop the VI.
Thanks,
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How to send a ttl signal with a good exactitude less than 10ms?

i have a pci 6013 (8 input channel) and pci 6711 (4 outpout channel).Then i need to send a ttl signal to a camera ccd to take a photo when a waveform sinus is equal at zero (rising), but when i send this TTl signal with dasylab using generator pulse or combi trigger and readind this signal, i have difference between dasylab pulse(that is exactly) and measurement pulse that is approximate 40ms after.But i need to have less than 10ms is it possible?
Frequence rate =1000hz and block size=512 the waveform sinus is 0.2Hz.i have already try to increase the sampling rate but nothing happens.Thank for your help.

Yes, it's possible.
You just have to reduce your block size to 10 !
For more informations, visit Forum Dasylab en français at http://forum.aceboard.net/?login=128657
Frédéric Miqueau
MD Electronic, France
http://www.mdelectronic.fr
French Dasylab Forum : http://www.dasylab-forum.de/forum/index.php?showforum=43

How to send a modulate signal by the NI PXI-5441?

How to send a modulate signal by the NI PXI-5441?
I am using NI PXI-8108 / PXI-5441.
I want to send a binary signal modulated (FSK) by the 5441. I tried to use, without success, the modulation VIs with the Fgen VI.
Thanks

Hi Mauro,
the code structure is similar to any structure of I/O. You need open the communication channel with the hardware (using VI Open), use VI Write/Read to send/receive data and close the reference (VI Close). You can look the structure in LV examples.
Nevertheless, if you cannot, post your code that I analize to you.
Regards,
Ricardo Ramos
Engenheiro de Vendas - Sul
National Instruments Brasil

When using DAQ assistant to read frequency

When using DAQ assistant to read frequency and Task timing is set to:
N Samples, Clock settings to read 26,
Frequency setup to rising edge,
1 counter with 10 kHz to 1 kHz range.
I get back a single number.
Can I assume this is an average reading of 25 samples with the first sample unused?
What is the base clock used?
Is the “26” 26 cycles of the frequency to be measured?

Hello,
If you choose to acquire N samples from the DAQ Assistant then it will acquire all of these samples and return them to LabVIEW as an array. However, when you use the DAQ Assistant it outputs the data in the dynamic data type first. This data type makes it easy to graph and run the data through other express VIs. If you were to create a Numeric Indicator from this data type it would just display the last element from the dynamic data array. To display this data properly in a numeric format convert the dynamic data to an array of doubles by using the Convert From Dynamic Data function in LabVIEW. Then you can select to convert it to a 1D array of scalars and when you create an indicator off of the output of this function all of the data should be displayed.
The timebase that is used for lower frequency measurements is the onboard clock, which is internally connected to the Source. Then you connect your signal to be measured to the Gate of the counter. Since the frequency of the onboard clock is known it can be used to calculate the frequency of an unknown source based on when the counter is on and off (determined by the Gate).
Have a good day,
Brian P.
Applications Engineer

Sending and receiving Signal through Internet connection

Hello,
I want to send data that is a continuous generated signal through internet.
I want to transmit this signal live through internet technology.
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Regards

Hello,
I have made a basic VI using Network Stream, it send Random Number generator which i want to plot on a waveform chart on the other side.
But when i run the VI on continuous mode it gives an error as End point broken on the client side.
Kindly guide where i am lagging.
Regards
Attachments:
streams.vi ‏14 KB

Splitting one signal from DAQ

Hi I m just working on my project and part of this is also build interface in Labview to use DAQ device 6008.
DAQ device serves to acquire Voltages from thermistors and my interface should split this signal for example like this:
=if(and(x>=8,D65<=8.54),-33.1*LN(D65)+46.12,if(and(x<8,x>=7.12),-40.1*LN(D65)+34.11,if(and(x<7.12,x>=6.15),-51.2*LN(D65)-0.28,"Out of Range")))
but this is just excel equation that works. I tried to do something similar in quation node because that would be the simpliest way for me, signal that enters the node is x and leave as y and goes to the waveform chart, but it didn`t work.
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thank you in advance

Hi and thank you for your answer.
First file is the interface I created without DAQassist because I was told it will be the same when the numeric controllers will be replaced with DAQ assist, and this interface works.
The next file is with DAQassist and there is many errors regarding the wires types and even when I add "convert from dynamic data" after signal is split then I get next error, and even when I ad "index array" that is recomended for this error when I run simulation I m getting next error regarding my functional node.
If you can help I would really appreciate it.
I have to find my very first file which include only functional node and I will forward it to you.
Best regards
Tino
Attachments:
Tino_equation_node.vi ‏124 KB
Tino_equation_node_DAQ.vi ‏176 KB

Sending/Re​ceiving Signals using DAQ

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Sending/Receiving Signals using DAQ