"Timed event" for peak detection input

I have a program that takes some data and looks for peaks in the data it collects. What I need to do is make a timed event such that the "peak width" parameter will change from one control variable that I can change manually to a second one after a certain time. Do I need a second loop and some boolean logic for this, or is there a much simpler way?
I don't have access to the entire program right now, but the attached screenshot should contain all the relevant stucture.
Attachments:
untitled2.jpg ‏112 KB

Sorry for the multiple posts.
Upon closer inspection of the first VI image attached, I think I should clarify a bit more. In this attachment, a subVI called "peak detector" is being used to locate the magnitude and position of maximum values of the data array. I think this is the similar VI as the one shown here. This VI is being passed the following input parameters:
So it looks like the goal is to change the value of the "width" input manually after a certain period of time has elapsed. There was some ambiguity in my mind of exactly what this meant.
If we just want to change the value of the "width" input during future iteration(s) in the stacked sequence structure, one way would be to place a different control inside each stacked sequence structure. You could add Wait (ms) VI's inside each stacked sequence to delay the progression from sequence to sequence.
By contrast, if the goal is to change the value of the "width" input in the middle of the "X" array, then we could alter Detect Peak VI's default behavior by going into the block diagram of this VI. You might need to press "Ctrl+m" on its front panel to get an editable VI in this case. There, switch the threshold value to another added input parameter after a certain number of iterations into the array.
What is the behavior that you want to see?
Just some thoughts if you haven't solved the issue yet. Hope this helped, let me know if you have any questions or comments, and best of luck.

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In the table maintenance generator, Environment --> Modifications --> Events then a screen will be appear here,we need to create the Events.In the EVENTS screen, press new Entries, there give 01(Before Saving the Data in the Database) and give a name(This will become a PERFORM), then click the Editor pushbutton, this will be there at the right side of the entry, then a popup will be appear, you can create an include program, there inside of the include program write ur code.
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Event 01: Before Saving the Data in the Database
Use
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How to use peak detection in labview to detect peaks from data acquisition information

Hi
I am a university engineering student who is working in a team to develop a coin detector, its purpose is to recognize different coinage and detect fakes.
For this we are using LabVIEW 8.5.1. I am relatively new to labview and have had no experience of using to before. We are trying to integrate four voltage signals produced by an electromagnet, straingauge, optical sensor and a proximity sensor. We have already developed signal conditioning for these tests and now wish to put them into labview.
Our plan is to use peak detection on each of the tests so that labview can detect peaks which correspond to different coin types, provided they meet set criteria for each coin. Then to combine these either using logic or mathscript to produce a Boolean output for each coin.
One of our advisors helped us develop a peak detection program for a simple simulated sine wave however we are struggling to adapt this for data acquisition information and itegrate it with mathscript and to be honest it does not make much sense. I have attached the program below. Thanks in advance for your assistance.
Attachments:
Strain 2.vi ‏25 KB

Chris,
Here are several ways to help you get started with peak detection:
1. On your functions palette, you can search for "peak detect" and you'll find several different variations of VIs that will do peak detection.
2. You may also want to take a look at this tutorial: Peak Detection Using LabVIEW and Measurement Studio
3. There's an example in the example finder called "Peak detection and display" that will probably be useful.
Hope this helps,
Misha

Peak Detection with Base package

Hello,
I'm constrained by a budget so I can't purchase the analysis package
just for peak detection. Does anyone have any hints on how to search a
1-D array for peaks without using the pre-made VI's? I've been pulling
my hair out over this one for a week!
Thanks in advance.

Labviewguru wrote in message news:<[email protected]>...
> Jason,
>
> I would suggest looking online for a "peak detection" algorithm.
> There are a number of ways to do it. The LabVIEW peak detector using
> a least squares quadratic fit to find the peaks, with a filter of
> amplitude and width. This can also be done much simpler ways. You
> can try applying a smoothing filter (use a moving or windowed average)
> and then look for peaks that way.
>
> Please post if you need more assistance. Also, what are you trying to
> do with the peak detection. This would be helpful in providing
> further assistance.
>
> Good luck
Labviewguru
Thanks for the advice. Yeah, the NI home page tells me that th
ey use a
least square quadratic fit to find the peaks. I'm not sure on how to
implement that. I'll do a web search on that one. I'm not dealing with
a very noisy signal so I don't think that I need to do a moving
average. The amplitude filter seems pretty easy, I just compare each
point to a preset threshold. However my peaks are composed of more
than one sample so each peak gives me a bunch of "true" values. I only
want one count per peak. The way I thought of doing it was using
hysteresis and starting a subroutine when the upper limit boolean went
hi, then resetting the subroutine when the lower limit boolean went
hi. So essentially i need to have labview look for a high, THEN look
for a low, THEN reset over and over again until the sample array is
finished. I'd love to work on this for days but I've already put too
much thought into it.

Peak detection with two thresholds

Dear colleagues!
Excuse me, but I need example or any help for peak detection with two thresholds. Namely two adjustable thresholds with standard peak detector for creating a detection's bandwith or range.
Peak detector have only one level threshold... But why only one...
Solved!
Go to Solution.

If I understand correctly, you want to set two thresholds as shown in the image below.
The top peak is easy, so no need to go into details for that one.
The peak for the second threshold (red) will be a bit more difficult to do.
You would need to filter out the signals that cross the top threshold (blue). This would be done by identifying the values as they cross the top threshold boundary. You would then need to build a "window" around them (we'll come back to this one).
You would need to define a range of valid values for the 2nd peak, which are from the bottom threshold to the top threshold. Search for the number of values that cross the top threshold plus one. The "plus one" is the one you will want to search. With all the other peaks that you do not want, you can create windows around them. The remaining one is the peak of interest.
Message Edited by Ray.R on 10-23-2009 08:21 AM
Attachments:
2Thresholds.PNG ‏6 KB

Peak detection method

Hi,
Can anyone recommend the best method to use for peak detection incoming
array of data (represents ECG).
I would like to use the 2nd deriviative method, any ides if its
recommended, and how best to use it?
Thanks

There is a vi called "Waveform peak detection.vi". You set a threshold to detect peaks or valleys.
www.vartortech.com

Regrading peak detection Vi input

I would like to use this peak detection but i would like to remove the signal source and use my own input instead. Could anyone teach me how to do it? thanks^^
Attachments:
Peak Detection and Display1.vi ‏37 KB

The input to the peak detector VI is a simple DBL array. I would recommend you use Peak Detector.vi instead of the unexposed subVI in your code (from the biomed toolkit?).
Where are you getting your data? How you get from there to the peak detector will depend on this, since your data type could be dynamic data type, waveform, or simple array. When in doubt, search the LabVIEW help first.
This account is no longer active. Contact ShadesOfGray for current posts and information.

MyRIO FPGA FFT Express VI timing analysis for multiple input mode - trying to perform fft's on a 3-axis accelerometer

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Project Background:
I've been working with the myRIO FPGA in an attempt to generate an application capable of sampling a tri-axis accelerometer and performing an fft on each axis. I've successfully developed an application for a single axis, but attempting to duplicate the code to sample the second and third axes in parallel results in an estimated 150% resource utilization for the tiny FPGA's LUT's. Additionally, I'm looking to avoid sequentially processing each accelerometer input using triggers and a single fft block because that reduces my fft update frequency significantly (e.g. I can't calculate another fft for input 1 until I calculate an fft for inputs 2 and 3).
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I hope that this helps!
Thanks,
Frank
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Time zone compatability problem with timed event created on iOS and pushed to Windows7 Outlook calendar for sharing

Hi, I am in Jerusalem time zone. My Windows7 LAPTOP time zone is set to it (UTC+02:00 Jerusalem). My iPhone5 and iPad are both "Set Automatically" (ON) to Jerusalem. When I create any new event in my outlook on my Laptop it's generated with the Jerusalem time zone and pushed properly via iCloud to my iPhone and iPad. However when I create a new timed event on either my iPhone or iPad. or even in iCloud calendar (in a browser) the event is pushed to outlook on my Laptop in a "Beirut" time zone. Now that both Jerusalem and Beirut are on the same time zone (UTC + 02:00) it doesn't create any problem (though I prefer to see that the pushed events are indeed in Jerusalem time zone and not Beirut...). However, at and around day time saving change days there are problems of events created on iOS devices or even in iCloud (using browser) and pushed to outlook at the wrong times (1 hour earlier or later, depends on the change direction in Jerusalem time...) with a Beirut time stamp.
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I also have this issue (iPhone 5). Outlook needs to be configured properly in that timezone option needs to be selected. Which is challenging enough.
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How can I import photo to computer if my photo were save in event instead of saved photo for ipad1? Why Photo in event are not detected ?

How can I import photo to computer if my photo were save in event instead of saved photo for ipad? Photo in event are not detected.

Importing Personal Photos and videos from your iOS device to your computer.
http://support.apple.com/kb/HT4083
 Cheers, Tom

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mdnb2,
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Chris Reed wrote:
With the help of Ben (see http://forums.ni.com/t5/LabVIEW/Determine-cluster-element-clicked-in-mouse-down-event/td-p/1245770)
I could easily find out what sub-cluster had been clicked on (mouse down event) within the main cluster, by using the Label.Text Property.
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I just wanted to use one "Main Cluster":Mouse Down event and from that determine which of the sub-sub clusters had been clicked on - is this even remotely possible?
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Yes but... you will have to pass through 26 Kudos worth of Nuggets to get there (Well maybe you can skip the last 5 or so).
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This Nugget by me talks about getting at references inside arbitrary data structures. (11 Kudos, You don't have to read the whole thing, only enough to get at nested objects).
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So Possible? Yes!
Easy? YOU tell me.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Looking for function or vi to calculate 1/2 power points of data obtained from peak detection vi

I am analyzing vibration data and need a function or vi that will operate on peak data returned from the LabView Peak detection function and provides 1/2 power points or sideband frequencies. These are needed to compute a "Q" factor. So far I have not been able to find anything.
Thanks, Fran

The sound and vibration toolset may help here. there are several vibration level measurements including peak. With the advanced FFT functions in the Sound and Vibration tools, the zoom FFT can be used to identify and find sidebands and associated amplitudes.
here is a link to the manual
http://digital.ni.com/manuals.nsf/websearch/1F8691E94728BDF5862570490058C3B2
here is a link to the toolset
http://sine.ni.com/nips/cds/view/p/lang/en/nid/10521
please note the bullets on the above page (about half way down) noting peak detection, etc.
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

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I'm having the same issue with my 3rd gen iPad too. I always viewed my calendar in month view. It won't even open since it's stuck on month view.
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"Timed event" for peak detection input

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