Web Scraping

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Friday, 7 December 2012

CLAD certified today !!!

Posted on 18:22 by Unknown
I just passed the CLAD LabVIEW certification exam.  It was a bit tricky.  I studied everything I could find. 

In my opinion, the test consisted of half of the standard questions you find on the online practice exams.  The other 50% I have never seen before except for in the Core 1,2, and 3 classroom exercises.
It was 40 multiple choice questions.  I finished in less than 30 minutes and used the rest of the time to review my answers.

My advice to anyone taking this test is to study the practice exams, but also methodically go through all the exercises of the Core 1 through 3 classes.  If I would have reviewed those examples in the classroom exercise book, it would have greatly improved my final score.
For those who have not taken Core 1 through 3, I'll try to give a few examples in the next few weeks.

Stay tuned.
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Saturday, 6 October 2012

Count to Three

Posted on 11:03 by Unknown
Just like a programmer starts off printing "HELLO WORLD" on the screen, in LabVIEW you can start off by learning to count to three. It's not easy or intuitive to find a way to count between two numbers. The key words are "Quotient & Remainder." On the Block Diagram hit CTRL and then SPACEBAR at the same time to pull up the Quick Drop dialog box. Type in Quotient & Remainder. It should find it by just typing in Quo....
Now add a While Loop around the Quotient & Remainder.

 

We will use the iteration (i) terminal from the while loop to show the current loop count. The iteration terminal starts with zero on the first sequence. We connect a wire from the iteration (i) terminal to the X input of the Quotient& Remainder.



We need to add an upper limit number to the Y input of the Quotient & Remainder.  So Right-Click your mouse over the Y input and Create a Constant.  We want this vi to count from 0 to 3.  Put a 4 in the constant box.  The output will count from 0 to 3 because the first count will be the zero and the fourth count will be the number 3.

Right-click on the upper right output connector of the Quotient & Remainder and create an Indicator.  This numeric indicator will be shown on the Front Panel.  This is where the numbers will be seen.  If you want to use this number for another operation, just add a wire and connect to another vi, or a graph, etc.

You will need to add a Stop button to the front panel for this example and wire it to the Stop if True function of the While Loop at the lower right hand corner.  Let's also slow it down a little so we can see the operation working.  Add a Wait Until Next ms Multiple icon with 500 as a constant wait time.

Hit run and watch the numeric indicator count from 0 to 3 on the Front Panel.  Hit the Stop button to end the process.

Thanks for learning how to Count To Three using LabVIEW with me.  Feel free to leave a comment.



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Tuesday, 2 October 2012

Posted on 10:34 by Unknown
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Wednesday, 27 June 2012

LabVIEW & Arduino

Posted on 09:41 by Unknown
Labview By Fairweather, Ian (EDT)/ Brumfield, Anne (EDT) (Google Affiliate Ad)
Arduino or compatible device

Install the NI-VISA drivers.
  • Windows Download.
  • Linux Download.
  • Mac Download.

Install JKI VI Package Manager (VIPM) Community Edition (Free).
  • All Operating Systems.
Install the LabVIEW Interface for Arduino as described here.

Connect your Arduino to your PC as described in here.

Load the LabVIEW Interface for Arduino Firmware onto your Arduino as described in here.
   
Once you have everything loaded into the Arduino, attach an LED to pin 9 and build a VI in LabVIEW that will turn on the LED with a switch from the Front Panel of LabVIEW.


Download this vi here:  BasicArduino3.vi


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Wednesday, 13 June 2012

Buy, Shop for LabVIEW

Posted on 07:26 by Unknown
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Sunday, 27 May 2012

Website scraping with LabVIEW

Posted on 19:17 by Unknown
Scrape or retrieve data from a website using LabVIEW. This is also called data harvesting or data extraction from websites.

One difficulty is finding good HTML data to scrape. Most data like stock quotes have been replaced with dynamic data that doesn't have a clear and consistent text strings that can be searched.

Here is an example that opens a URL website, reads the HTML, picks out a string keyword and displays the data after that keyword. I've chosen a weather site that has a consistent keyword like "temp"> and the page is dedicated to only one city. So the number after "temp"> will be that city's temperature.


This vi will be great for any instrument attached to a network with a web-page to access.


More details can be found here.

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Posted in basic, dashboard, data socket, HTML scraping, LabVIEW, programming, website | No comments

Wednesday, 23 May 2012

Posted on 20:46 by Unknown


LabVIEW Web UI Builder
LabVIEW Web UI Builder is a Web-Based LabVIEW programming Environment that gives you the ability to develop lightweight VI's without needing to purchase LabVIEW.

Practice creating and programming VI's now.  Try It Now     Create your account to start programming with LabVIEW.
LabVIEW Web UI Builder is free to try out for an unlimited amount of time. Anyone can create an account and develop an application that runs inside the editor. Users can save their work to cloud storage or, if the editor is installed locally, to a local hard drive. The only feature that is not available for free is the ability to build and deploy standalone web applications that no longer require the editor.
Microsoft Silverlight® is required; click here to install.

I loaded it on my computer and tried it out…  It’s awkward to use but it works.
Here are some screen prints and the example vi…
http://zone.ni.com/reference/en-XX/help/373286A-01/uibuilder/wuib_gsg1/

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