Questions about shift register

hello!When I use the shift register，A problem occur！what I want to use is the serial in shift register function，But found only use parallel shift register，someone can give me any suggestions？(The best way has an example of a serial shift register),thanks!!!
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I want to achieve ：Each element of the array in the shift register Compare with 5，If less than 5, the output is 1, otherwise 0；but as you can see the vi is wrong ;Error reason is because of the shift register only for computing the entire array but not Single element，any suggestion?
Attachments:
the vi.png ‏8 KB
array.png ‏5 KB

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Problems about shift register

i am using shift register to detect the change of state of my system. --- to detect when the temperature exist the limit, say 50 degree
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My problem is that the system can't run well.
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Attachments:
shift_regiter.vi ‏225 KB

Hi,
Yes I did see your eaxample.
Your inner loop will only ever get one reading if it is inside your limits because it will never exit and therefore your outer loop will never take another reading. Your limit checking needs to be in a parallel loop for it to have a chance to work.
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How to use Shift Register?

Hi
Today I spend hours to ficure out how to use a shift register with labview.
I am going to calculate the acceleration of the wheels of an RC-car.
I want to use the simple function to calculate the acceleration.
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From this it follows that I need two speed (ms) values. I was thinking about including a shiftregister that I made before (attached) into the SpeedAngle.vi
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Bye
Attachments:
ShiftRegister1.vi ‏23 KB
SpeedAngleAdvancedEDIT.vi ‏187 KB

Hi
Thank you very much. Now it works. Attached you will find the program. Now I need to adjust the car with the program. Hope this also works.
One more question. Why isn't it possible to use a Numeric Control twice?
Because I wanted to use the Numeric Control that I use for the time constant (time) also for the calculation of the acceleration.
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Bye
Attachments:
SpeedAngleAdvancedEDIT.vi ‏214 KB

Reading spi shift register bit with NI 8451

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Uninitialize shift register

Hallo,
I would like to ask a question about the uninitialize shift register. I would like to use a uninitialize shift register in a subvi in order to pass data between subsequent calls of the subvi.
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Hi achille,
ok, but where is the problem, it shows only that the "insert into array" function don´t dictate the array size.
Where do you need it?
One solution is to insert a case structure inside the while loop. Insert your code into the true case and an array constant into the false case. Connect a true to your case structure and you have what you want. But remember use a boolean control or a shiftregister value! If you connect a constant, then labview know that this case will never be execute.
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Message Edited by MikeS81 on 06-06-2008 01:01 PM
Attachments:
Unbenannt1.PNG ‏14 KB

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Is there a way to save state of shift register for initializing next time vi is started?

Hello all,
I've a quick question. I have right now....a numeric constant...starts with "1" intially when starting the vi.
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Shift register versus comparison in while loop

Hello,
I have a question regarding the "proper" (i.e. cheaper in terms of system ressources, easier to read, etc) way of testing the first entry in while loop. One way would be by using a shift register another by detecting if the loop iteration is zero (see the exemples attached here). I am doing some calculations in this loop, typically 300 iterations or so.
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Thanks
N
Attachments:
while_loop1.png ‏54 KB
while_loop2.png ‏53 KB

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If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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National Instruments is starting a new newsgroup to provide a forum for customers to discuss register level programming issues and ask questions. This newsgroup is not a direct support channel for register level programming, but may be monitored by National Instruments engineers. Please post you question with additional detail in:
natinst.public.daq.driver-development.general
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to the Sample Code License Terms which can be found at: http://ni.com/samplecodelicense

Using a shift register to detect input...

Hi guys,
I'm creating a LabVIEW VI that needs to be able to detect when a user changes an input. I read a previous post that suggested using clusters and shift registers to compare previous data.
My question is how do I use shift registers? I've created a shift register on a for loop, but I'm not sure when to compare the "previous" data to the "new" data. Do I need to add an element to the left side and compare it there? Is the right side the output? I'm just not sure how it works. An uploaded example would be nice. Thanks.
-Mike

Shift registers are very powerful but difficult to use for the first time.
The shift register you just created has two "arrows", one on either side of the structure. The arrow to the left is the value from the previous (i:th) iteration and the arrow to the right you have to feed with the (i+1)th value.
Now, if you want to compare values and look for a change you can compare your old value (the one coming out from the left) with the new value in your for loop. The feed your new value to the right arrow so that it becomes the old value for the next iteration.
If you have many parameters to compare, clusters are very useful since they make things very compact. If you are comparing clusters, do not forget to change the setting on the comparison to compare aggregates (r
ight click on it and select that option).
Also, in most cases you need to set the initial (start) value for your shift register. This is done by feeding the left arrow with the default value from the outside of your loop.
I attached a simple example, CompareSettings.vi, that shows how it works. Hope this helps. /Mikael"
Attachments:
comparesettings.vi ‏32 KB

How do i read the Shift register value of a vi which is written in the teststand sequence from labview exe

Dear All..
My Qusetion is ... I have a VI in which I can writ the data to shift register and I can read( Differenent cases). I am Running the VI in write mode to write SAY '100' in the shiftreg( VI will be In teststand Sequence) . And I am reading the VI in read mode using Labview. I am getting the data in labview.
When i conver my Reading Vi which is having that Read/Write vi in to EXE even then the test stand is writing the data to VI is Unable to reflect in labview.
Please Help me out with some solution.
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I'm confused by your question:
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Any way to save data in loop without using shift register or feedback loop

Hello all
I was thinking, is it possible to save data in a loop to next iteration without the use of a shift register or a feedback loop?
I need the possibility to reload data within a loop from a lvm file, but I want to use the same data until i load some new ones.
The reason why I don't want to use the shift register or feedback node is due to speed, even though I am not sure if the shift register
actually moves all the data from one register to another, or if it is stationary until a change in the data occur.
The data I want to reuse is medium-large (6 force measurements, 2 pressure, 1 flow channels)of about 10sec data in each file with samplingsrate of 2kHz..
In my analysis program I have many CPU demanding calculations and 3D graphs, so I just want to minimize the CPU load as much as I can for each part of the
software..
I have attached a small VI to explain what I am talking about.
I now I shouldn't use the express VI, and I am going to change that as well - this is just a proof of concept!
Hope you guys can help me understand this shift register better...
Thanks!
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Running LabVIEW 2009 32bit SP1 on Windows 7 64Bit
Solved!
Go to Solution.
Attachments:
visual.vi ‏34 KB

tombech wrote:
[...]The reason why I don't want to use the shift register or feedback node is due to speed[...]
Tommy,
shift register are the fastest you can ever get...........
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Questions about shift register

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