Over acquisition and real-time mapping
I think you should set a stop condition on your loop. After getting your last sample, you can call DAQmx Read again and you should get error-200278. That actually makes sense. You can index in your waveform and "Get the components of waveform" allows to get the table to, and then use an array size VI to account for the number of samples # you acquired (see photo). When you reach the number you wait, stop your loop. You can also solve this problem by reading the 10 instead of-1 and count (i + 1) * 10 = acquired samples.
Whatever it is.
Let me know what you find.
Tags: NI Hardware
It is a VI for the continuous acquisition of an ECG signal. As far as I understand that the analog read DAQmx VI must be placed inside a while loop so it can acquire the data permanently, I need perform filtering and analysis of the wave in real time. How I implemented the block schema means that data stays int the while loop, and AFAIK the data will be transferred on through the tunnels of data once the loop ends the execution, it clearly isn't real-time data processing.
The only way I can think to fixing this problem is by placing another loop that covers the screw scene filtering and using some sort of registeing shift to transmit the data in the second while loop. My question is whether or not it would introduce some sort of delay, and weather or not it would be supposed to be the treatment in real time. Wouldn't be better to place all the screws (aquicition and filtering) inside a while loop? or it is a bad programming practice. Other features I need to do is back up the data I na file, but only when the user wants to do.
Any advice would be appreciated.
You have two options:
- A. as you said, you can place the code inside your current while loop to perform the treatment. If you're smart, you won't need to put one another while loop inside your existing (nested loops). But it totally depends on the type of treatment that you do.
- B. create a second parallel loop to perform the treatment. This would be separate processes to ensure that the treatment is not obstacle to your purchase. For more information, see here .
Your choice really depends on the transformation that you plan to perform. If it's much the processor, this could introduce delays as you said.
I would recommend that you start at any place in the first loop and see if your DAQ buffer overruns (you can monitor the rear of the buffer during operation). If so, you should decouple the process in separate loops.
In what concerns or not ' it would be considered as real time processing ' is a trick question. Most of the people on these forums say that your system is NEVER in real time because you're using a desktop PC to perform processing (note: I guess it's the code that runs on a laptop or desktop?). It is not a deterministic systemand your data is already "old" by the time wherever he leaves your DAQ buffer. But the answer to your question really depends on how you define "real time processing". Many lay it will set as the treatment of 'live' data... but what is "actual data"?
I am generating an output through OR pxi 6733 using the basis of programming in labview 8.6 mx DAQ.
The problem is when I create a digital output channel indicating an error and say not supported for this target.
I'm not able to use the base that I have all of the same software version installed in the HOST and TARGET of mx daq.
I use in time real 8.6 and daq mx 8.9.5.
Thanks in advance.
You use DAQmx or DAQmx Base?
I guess his DAQmx because DAQmx Base does not run on the objectives of the RT.
Can you provide us with an error code?
I'm doing my third LabVIEW Wipe/reinstall in as many days, completely frustrated (and after several calls an hour with the support of NEITHER). Here's the situation:
I wrote a fairly large (1000 VI) project of Acquisition/control of our graduate students data used for behavioral experiment on sound localization. It was developed in 2012 LabVIEW with the module running on a PC/PXI system real time. It worked very well and was brought successfully under LabVIEW 2014 (with upgrades comparable to the software of the PXI.
About 18 months ago the students began to write their theses, and at one point stopped gathering data. Also, at some point, I upgraded the software on this system to LabVIEW 2014 SP1, but I am not sure that I never tested my software with this new system.
This week, I pulled up the system to use MAX to open some test on the PXI multifunction and DIO card panels to control manually one of the stimuli. I discovered that MAX could not communicate with the advice on the PXI system - he attributes them as devices VISA, indicating each Board with an icon with a red X means that he could not communicate with the IP that I had assigned to PXI. Yet, MAX (a) could "discover" this PXI, (b) MAX can 'see' its IP address, and (c) Windows could not only Ping the IP, but could FTP on the drive of the PXI and I could move files back and forth.
I did two sequences complete "Wipe/reinstall" using LabVIEW 2014 SP1, all giving the same result. I know it has worked in the past, including when I installed LabVIEW 2014 (without SP1), something I repeat myself now with my third installation. I discussed with OR (thin?) possibility that there is a "hidden defect" in the Distribution of the SP1, one that is visible to LabVIEW RT users using PXI hardware and go unnoticed because (a) install a few sites of LabVIEW versions SP1, (b) a minority use the RT Modules and (c) PXI is "old material".
If anyone has such a system or saw a similar problem, please answer. I'll do a follow-up post if I managed to 'fix' my system by this last reinstallation "a solution of worked before."
Well, the answer is that, in my system, LabVIEW 2014 SP1 with LabVIEW Real-time connected to a PXI system does not appear to connect to boards plugged into the chassis. Returning to LabVIEW 2014 (fall release), installed in exactly in the same way that the three failed attempts of LabVIEW 2014 SP1, works immediately. Engineers OR will try to duplicate/verify/possibly patch? in this issue.
HI I am facing strenge same problem in the application of vision. I'm using equipment NI CVS 1454. Is there an OCR on CVS application that inspect the product on the conveyor. I made different characters to choose file of different labels on the product. Now main problem is sometimes not exactly when my chracterset file, Pattern matching templete and corrupts my exe in real-time. I joined a few ok and corrupted file characterset here and also an exe in real-time.
When I open my file (.abc) characterset in Notepad, that I found damaged files after entering text.
#Date: Wed, Aug 1, 2008 11:28
LVRT. DLL loads the address: 0x002F6000
I don't understand how this error massage journal if written in .abc or rtexe files, which make it currupt... I have also attached my structuring code image file.
I do not know how to disable the log of LabVIEW RT errors, at least, is not that you or I could have access.
It's the idea that deactivation of LabVIEW RT logging of errors will decrease even more the impact of corruption?
Have you made progress with your service request?
I am recently using LabVIEW 2011 and 2011 real time Module. My application requires the PID control.
Now, I have a problem. In the manual for "And Fuzzy Logic Toolkit PID", Chapter 2 "algorithm PID" it indicates non-interactive algorithm (also called the ideal algorithm, Standard or ISA) be used in all the screws of PID in the Toolbox. It seems that Yes from source code. However, in Chapter 3, "Using the PID software" arrays of calculation of PID parameters based on method of Ziegler-Nichols, which was developed for the interactive algorithm (also called the series, the real classic algorithm). D action has been included in the scheme of control, the settings may be different for the two algorithms. In fact, Cohen Coons and adjustment PID Lambda rules can be used for the algorithm used by the box tool with no conversion.
In addition, there is a PID function block comes with the real time Module, and I know not what PID algorithm it uses. Can someone help me?
Thank you in advance.
In the "and Fuzzy Logic PID Toolkit, we use the University structure to implement all algorithms. Tuning techniques we show on the manual to express the original work and we try to keep the same as you would look at the literature. However, in our implementation of autotuning internally converted to the structure used by our algorithms to keep compatibility with our own implementation.
If you use an external source, you can use the Conversion.vi of Structure PID to change University, parallel or series of parameters in one used by our algorithm.
The PID included with the real time module is a 'copy' of our algorithm, and they have the same settings and behavior. The only advantage to use this function block, you have access to the parameters through variables.
Hope this helps...
I created a small program in labview FPGA which gets continually distance from the HC - SR04 ultrasonic sensor. The rest of the robot program is written in the time module real Labview. Is it possible that the distance calculated by FPGA module to read in time real module.
I used the FPGA just because there micro-deuxieme counter, which helps me get the distance from the ultrasonic sensor.
Thanks in advance.
There are many ways this can be done, according to your needs.
See the help article transfer of data between the FPGA and host (Module FPGA) for a breakdown of each method.
I wonder if someone met fuel 3d design graphics containing factor of load on x and rpm on the y-axis. The ratios of fuel (running lean and rich) appear on the 3d graphic function where the mouse cursor is in the field. Its very common to see software solution turnkey in the market, but I hope that labview is capable of doing. If so, could you please help me on where to start. There are a lot of sensors on the car and I compactrio and everything also. I need help on the place where from, like which screw do I and this is the usual way of signal acquisition using daq assistant and so on?
Thank you very much in advance for your help.
Thanks and greetings
I'd say the best place to search for the start-up of your cRIO's finder example in LabVIEW itself there are a lot of examples available out there that might only need to the alternances of mine to find the solution you are looking for.
In addition the cRIO examples there are several examples that illustrate the use of 3D graphics who has X Y and Z axis
The image below is the example of trace of 3D surface.
I hope this helps you get started.
I'm doing my final year project. I'll send the data from a remote location using sim900d for the other module (sim900d) connected to my laptop. Now, I need to import data acquired through sim900d connected to my laptop in Labview. But I don't know how. Kindly guide me
I looked for it and thus to find a link that uses the serial port to send to commnads
so now send orders AT serial number is easy. first of all examine the emitting part. for this you need VI config series VISA and VISA series write VI. You can serach these VI by right click I your new VI block diagram and press search on the top left corner. Here you type the serial port and you will get a list of the VISA series live.
Here is also a link to or
Y at - it options of Microsofts Bing Maps, that would allow us to display real-time maps activities. Our company has a large inventory of cattle spread over a large area and it would be nice to make a quick trip of surveillance around the place without paying someone or personally taking the time for a journey too often. Your thoughts/solutions?
HelloI suggest you to ask your question in the following link.
I'm new to labview and trying to develop a system of eye tracking using labview 8.6. He has the vision development module, and I was wondering if this was not enough for the treatment and real-time image acquisition or could I need other software tools.
Yes, to acquire images from a webcam, you need drivers imaq-dx.
Take a look at this link:
Vista and the need for a kind of wide equalization system in real time for audio... and this driver seems to provide what I need... but will it work on my microsoft Driver card hd audio? If it is not possible, then what program could I use for an equalizer?
What is the model number of your sound card?
The drivers are specific to a device. RealTek drivers don't work for its Microsoft Map, you must install the correct driver for your device package works very well.
For more information about the driver, see the links below
Updated a hardware driver that is not working properly
Update drivers: recommended links
Equalizer you can see link below, also look on the internet for software that can help you in this task.
Change bass, stereo, and other audio effects in Windows Media Player
Note: Using third-party software, including hardware drivers can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the use of third-party software can be solved. Software using third party is at your own risk.
I'm putting in place a rotating decoder for use as a shifter of pulsation by labview real-time.
Basically, this means I have two input channels (ttl-legumes, ~ high 20us) rotary engine. A channel contains a pulse at each CA (angle cranc) ° up to 12 kHz (increment). The other channel contains a pulse every 720 ° CA (the charge cycle, BDC_cc low break-even point). With this information a pulse to be generated on an output also channel ttl (high), which triggers my setup of measurement. This impulse must be moved in a programmable relationship to the entrance of BDC_cc, which aims at a table of regular measure.
I got it running by streaming the channel of BDC_cc until a rising edge is detected, then count the edges of increment to the designated trigger point and then generate a pulse on the output channel. The problem is that the late 70-120us exit trigger. In short it's too; a maximum error of ~ 20 is acceptable. Digital channels appear to work faster, so I put discarded Counter-based acquisition.
I'm quite new to LabView, so I'm sorry if the answer is obvious...
My purchase setup consists of:
This configuration seems to exclude some options Labview offer, such as the external digital acquisition sampled or externally triggered by the acquisition in the base. A manual interpretation of analog inputs is way to slow.
I have attached my working version.
Any input appreciated woud...
I only have a minute right now, but think I can play with a device simulated tonight or tomorrow.
I'm quite sure that there would be a clean solution clocked by material if you use a series M or X-series
Council MIO, but the older generation counters timers on the set of the E series do support everything which
You need. It's been a while since I had to rely on this generation of hardware.
I think the basic approach is to use the lunatics of angle as the clock pulse train that defines the
delay time of the pulse you want to generate. You could be "Timer" the pulse based on the real
angular position, helping you synchronize to a specific angle of crank. The question is whether and how E-series
counters of takes to support the generation of pulses triggered (or redeclenchables). If they are not, I would say that you consider
get new hardware DAQ which support this kind of trigger and you give a very precise pulse
Hi, I would like to take advantage of some tools in the system in real time.
I thought that I could download it by file transfer,
and then did something like this in the system in real time.
Probably it is not...
However, there is other ways to achieve my thought in the system in real time?
Do you mean the exe was built for windows, so that it is not allowed to run in time real system?
I have to communicate between CompactRIO and servers through an ethernet cable...
so... you write a program runs on the cRIO and bring it to your servers over TCP.
Maybe you are looking for
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