Creating a digital counter in labview

Currently using a proximity switch connected to an SCC-DIO1 to read pulses from an encoder to develop an RPM measurement ( and angular velocity). How do I convert my digital pulse into a true numeric count per minute (or millisecond)? I'm able to detect the pulse from the module in labVIEW but I'm unclear on how to count the pulses per minute. Currently using labVIEW 7.1.

If all you're doing is counting pulses, you'd actually be better off
using the counters on your DAQ card. They automatically track the
number of pulses and can give other info like frequency. Look in the
Examples for Counter VIs to show you how to use them. There's a pretty
good one named "Getting Started Counter.vi".
If you're set on just using a digital line, the attached image shows
how to setup a basic 32 bit counter. (but I still suggest you have a
look at using the Counters)
Ed
Message Edited by Ed Dickens on 07-14-2005 03:38 PM
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.
Attachments:
32 bit Counter.gif ‏5 KB

Similar Messages

How do I create a digital signature on a TCP or a UDP flow?

I am trying to convert samples of a voice signal, which is intercepted from the microphone, into fixed length digital signature bytes (using Hash, or) and attach these fixed length bytes to a communication session between two terminals (UDP or TCP "HTTP"). The other receving end should be able to identify the person at the sending side.
Any thoughts how I could do this?
Any help is most appreciated.
Sam

Sam,
If you have the Sound and Vibration toolkit it may make some things easier for you regarding the voice-recording aspect, but if you aren't recording and playing back the actual sounds, just using this for detection and digital signatures, you shouldn't need to worry about this.
1. For this you are going to be doing some form of Analog Input. Then you will be storing this data to a file. There are examples for both of these aspects in the NI Example Finder from within LabVIEW.
2. If you are going to be doing the FFT, there is a VI under the Mathematics Palette that performs this operation. Again you can use the same example for saving data to the file.
3. You would need to figure out what needs to be done to create a digital signature for this. There may be something in the Sound and Vibration toolkit for this, but I do not know.
4. For the UDP or TCP transfers, there are several examples for doing this and they cover how to create the connection and transfer / receive data. These too are in the NI Example Finder
5. This goes back to number 4, this would indeed be a separate program, but everything else would just be one project and one program.
6. This would depend on how the ID was created in step 3, again whether you do the algorithm on yourself or not. For comparing to the table, you would use a Search Array and some comparison functions, all depending on how you stored the data initially.
7. Graphs are all available on your Front Panel of your VIs and you would just wire up the data that you'd like and have it displayed on the graph.
There will not be an example for everything that you are wanting to do. The examples are meant to help you get started. Have you used LabVIEW before? I would recommend doing the 3 Hour LabVIEW Introduction Course to help you get started. This will cover some of the basic concepts that you will need to know in order to create your application.
Unfortunately I cannot write the code for you, only guide and direct you. LabVIEW is a programming language and does require the user to lay out and create their own program. You will not be able to just find three or four pre-built code-snippets and connect them together to get your appliction working the way you want it. You will need to develop the applications yourself.
Regards,
Jared Boothe
Staff Hardware Engineer
National Instruments

Digital counter data is not written into a file

Hello
I'm a beginner with labview and I'm trying to make a measurement program for my setup (sensor data -> file). I have the USB-6008 and I'm trying to save data from a digital counter and 3 analog ports. The counter is for RPM and the number of revolutions. Analog is used for force, potential voltage and temperature. Currently data from the analog ports is written to a file normally but all the data from the digital side is lost. So in the measurement text file columns for the digital data are empty.
The DAQ assist for the counter is set "on demand" but the analog DAQ assist has a sampling rate of 1k (continous). My problem propably comes from the different sampling rates. I could set analog sampling to "on demand" but I need the 1k rate for the measurements. Also making two different measurements files works but it's very inconvinient.
Am I right about the sampling rate and how would I fix this?
Attachments:
measurements.vi ‏144 KB

Think Data Flow. For a Loop to "loop", everything inside the loop must execute. Furthermore, since your loop starts with "Acquire one sample" and ends with "write one sample", the time for the loop to execute will be the sum of the times to sample (1 msec) + write (??).
Take advantage of the fact that LabVIEW in inherently parallel. Instead of taking one sample/loop, take (say) 1000, but do not write them in the same loop. Instead, "export" them to a parallel loop (via a Queue) so that when the 1000 samples arrive, they are written all at once. While it is true that to acquire 1000 samples at 1KHz will take 1 second, most of that time will be spent "waiting" for the next sample to be taken (it takes almost no time to put a point on a Queue). Similarly, if I have a whole second to write 1000 points to a file, that's more than enough time.
Separating "serial" tasks into parallel streams is a common LabVIEW Design Pattern called the Producer/Consumer pattern. There are numerous examples of this pattern, including a template that will write the basics of the code for you (open the File menu, choose "New...", From Template, Frameworks, Design Patterns, Producer/Consumer Design Pattern (Data)). A slightly more sophisticated example can be found by starting LabVIEW, New Project, Continuous Measurement and Logging.
Bob Schor

How to create the digital clock in java swing application ?

I want to create the running digital clock in my java swing application. Can someone throw some light on this how to do this ? Or If someone has done it then can someone pl. paste the code ?
Thanks.

hi prah_Rich,
I have created a digital clock you can use. You will most likely have to change some things to use it in another app although that shouldn't be too hard. A least it can give you some ideas on how to create one of your own. There are three classes.One that creates the numbers. a gui class and frame class.
cheers:)
Hex45
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.geom.*;
public class DigitalClock extends Panel{
          BasicStroke stroke = new BasicStroke(4,BasicStroke.CAP_ROUND,
                                           BasicStroke.JOIN_BEVEL);
          String hour1, hour2;
          String minute1, minute2;
          String second1, second2;
          String mill1, mill2, mill3;
          int hr1, hr2;
          int min1, min2;
          int sec1, sec2;
          int mll1, mll2,mll3;
    public void update(Graphics g){
         paint(g);
     public void paint(Graphics g){
          Graphics2D g2D = (Graphics2D)g;
          DigitalNumber num = new DigitalNumber(10,10,20,Color.cyan,Color.black);
          GregorianCalendar c = new GregorianCalendar();
          String hour = String.valueOf(c.get(Calendar.HOUR));
          String minute = String.valueOf(c.get(Calendar.MINUTE));
          String second = String.valueOf(c.get(Calendar.SECOND));
          String milliSecond = String.valueOf(c.get(Calendar.MILLISECOND));
          if(hour.length()==2){
               hour1 = hour.substring(0,1);
               hour2 = hour.substring(1,2);
          }else{
               hour1 = "0";
               hour2 = hour.substring(0,1);
          if(minute.length()==2){
               minute1 = minute.substring(0,1);
               minute2 = minute.substring(1,2);
          }else{
               minute1 = "0";
               minute2 = minute.substring(0,1);
          if(second.length()==2){
               second1 = second.substring(0,1);
               second2 = second.substring(1,2);
          }else{
               second1 = "0";
               second2 = second.substring(0,1);
          if(milliSecond.length()==3){
               mill1 = milliSecond.substring(0,1);
               mill2 = milliSecond.substring(1,2);
               mill3 = milliSecond.substring(2,3);
          }else if(milliSecond.length()==2){
               mill1 = "0";
               mill2 = milliSecond.substring(0,1);
               mill3 = milliSecond.substring(1,2);
          }else{
               mill1 = "0";
               mill2 = "0";
               mill3 = milliSecond.substring(0,1);
          hr1 = Integer.parseInt(hour1);
          hr2 = Integer.parseInt(hour2);
          min1 = Integer.parseInt(minute1);
          min2 = Integer.parseInt(minute2);
          sec1 = Integer.parseInt(second1);
          sec2 = Integer.parseInt(second2);
          mll1 = Integer.parseInt(mill1);
          mll2 = Integer.parseInt(mill2);
          g2D.setStroke(stroke);
          g2D.setPaint(Color.cyan);
          num.setSpacing(true,8);
          num.setSpacing(true,8);
          if(hr1==0&hr2==0){
               num.drawNumber(1,g2D);
               num.setLocation(40,10);
               num.drawNumber(2,g2D);
          else{
               if(!(hr1 == 0)){
                    num.drawNumber(hr1,g2D);
               num.setLocation(40,10);
               num.drawNumber(hr2,g2D);
          num.setLocation(70,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(100,10);
          num.drawNumber(min1,g2D);
          num.setLocation(130,10);
          num.drawNumber(min2,g2D);
          num.setLocation(160,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(190,10);
          num.drawNumber(sec1,g2D);
          num.setLocation(220,10);
          num.drawNumber(sec2,g2D);
          /*num.setLocation(250,10);
          num.drawNumber(DigitalNumber.DOTS,g2D);
          num.setLocation(280,10);
          num.drawNumber(mll1,g2D);
          num.setLocation(310,10);
          num.drawNumber(mll2,g2D);
          g2D.setPaint(Color.cyan);
          if((c.get(Calendar.AM_PM))==Calendar.AM){
               g2D.drawString("AM",260,20);
          }else{
               g2D.drawString("PM",260,20);
     String dayOfweek = "";
     switch(c.get(Calendar.DAY_OF_WEEK)){
          case(Calendar.SUNDAY):
               dayOfweek = "Sunday, ";
               break;
          case(Calendar.MONDAY):
               dayOfweek = "Monday, ";
               break;
          case(Calendar.TUESDAY):
               dayOfweek = "Tuesday, ";
               break;
          case(Calendar.WEDNESDAY):
               dayOfweek = "Wednesday, ";
               break;
          case(Calendar.THURSDAY):
               dayOfweek = "Thursday, ";
               break;
          case(Calendar.FRIDAY):
               dayOfweek = "Friday, ";
               break;
          case(Calendar.SATURDAY):
               dayOfweek = "Saturday, ";
               break;
     String month = "";
     switch(c.get(Calendar.MONTH)){
          case(Calendar.JANUARY):
               month = "January ";
               break;
          case(Calendar.FEBRUARY):
               month = "February ";
               break;
          case(Calendar.MARCH):
               month = "March ";
               break;
          case(Calendar.APRIL):
               month = "April ";
               break;
          case(Calendar.MAY):
               month = "May ";
               break;
          case(Calendar.JUNE):
               month = "June ";
               break;
          case(Calendar.JULY):
               month = "July ";
               break;
          case(Calendar.AUGUST):
               month = "August ";
               break;
          case(Calendar.SEPTEMBER):
               month = "September ";
               break;
          case(Calendar.OCTOBER):
               month = "October ";
               break;
          case(Calendar.NOVEMBER):
               month = "November ";
               break;
          case(Calendar.DECEMBER):
               month = "December ";
               break;
     int day = c.get(Calendar.DAY_OF_MONTH);
     int year = c.get(Calendar.YEAR);
     Font font = new Font("serif",Font.PLAIN,24);
     g2D.setFont(font);
     g2D.drawString(dayOfweek+month+day+", "+year,10,80);
     public static void main(String args[]){
          AppFrame aframe = new AppFrame("Digital Clock");
          Container cpane = aframe.getContentPane();
          final DigitalClock dc = new DigitalClock();
          dc.setBackground(Color.black);
          cpane.add(dc,BorderLayout.CENTER);
          aframe.setSize(310,120);
          aframe.setVisible(true);
          class Task extends TimerTask {
             public void run() {
                  dc.repaint();
          java.util.Timer timer = new java.util.Timer();
         timer.schedule(new Task(),0L,250L);
class DigitalNumber {
     private float x=0;
     private float y=0;
     private float size=5;
     private int number;
     private Shape s;
     private float space = 0;
     public static final int DOTS = 10;
     private Color on,off;
     DigitalNumber(){
          this(0f,0f,5f,Color.cyan,Color.black);
     DigitalNumber(float x,float y, float size,Color on,Color off){
          this.x = x;
          this.y = y;
          this.size = size;
          this.on = on;
          this.off = off;
     public void drawNumber(int number,Graphics2D g){
          int flag = 0;
          switch(number){
               case(0):
                    flag = 125;
                    break;
               case(1):
                    flag = 96;
                    break;
               case(2):
                    flag = 55;
                    break;
               case(3):
                    flag = 103;
                    break;
               case(4):
                    flag = 106;
                    break;
               case(5):
                    flag = 79;
                    break;
               case(6):
                    flag = 94;
                    break;
               case(7):
                    flag = 97;
                    break;
               case(8):
                    flag = 127;
                    break;
               case(9):
                    flag = 107;
                    break;
               case(DOTS):
                    GeneralPath path = new GeneralPath();
                    path.moveTo(x+(size/2),y+(size/2)-1);
                    path.lineTo(x+(size/2),y+(size/2)+1);
                    path.moveTo(x+(size/2),y+(size/2)+size-1);
                    path.lineTo(x+(size/2),y+(size/2)+size+1);
                    g.setPaint(on);
                    g.draw(path);
                    return;
          //Top
          if((flag & 1) == 1){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Top = new GeneralPath();
          Top.moveTo(x + space, y);
          Top.lineTo(x + size - space, y);
          g.draw(Top);
          //Middle
          if((flag & 2) == 2){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Middle = new GeneralPath();
          Middle.moveTo(x + space, y + size);
          Middle.lineTo(x + size - space,y + size);
          g.draw(Middle);
          //Bottom
          if((flag & 4) == 4){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath Bottom = new GeneralPath();
          Bottom.moveTo(x + space, y + (size * 2));
          Bottom.lineTo(x + size - space, y + (size * 2));
          g.draw(Bottom);
          //TopLeft
          if((flag & 8) == 8){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath TopLeft = new GeneralPath();
          TopLeft.moveTo(x, y + space);
          TopLeft.lineTo(x, y + size - space);
          g.draw(TopLeft);
          //BottomLeft
          if((flag & 16) == 16){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath BottomLeft = new GeneralPath();
          BottomLeft.moveTo(x, y + size + space);
          BottomLeft.lineTo(x, y + (size * 2) - space);
          g.draw(BottomLeft);
          //TopRight
          if((flag & 32) == 32){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath TopRight = new GeneralPath();
          TopRight.moveTo(x + size, y + space);
          TopRight.lineTo(x + size, y + size - space);
          g.draw(TopRight);
          //BottomRight
          if((flag & 64) == 64){
               g.setPaint(on);
          }else{
               g.setPaint(off);
          GeneralPath BottomRight = new GeneralPath();
          BottomRight.moveTo(x + size, y + size + space);
          BottomRight.lineTo(x + size, y + (size * 2) - space);
          g.draw(BottomRight);
     public void setSpacing(boolean spacingOn){
          if(spacingOn == false){
               space = 0;
          else{
               this.setSpacing(spacingOn,5f);
     public void setSpacing(boolean spacingOn,float gap){
          if(gap<2){
               gap = 2;
          if(spacingOn == true){
               space = size/gap;
     public void setLocation(float x,float y){
          this.x = x;
          this.y = y;
     public void setSize(float size){
          this.size = size;
class AppFrame extends JFrame{
     AppFrame(){
          this("Demo Frame");
     AppFrame(String title){
          super(title);
          setSize(500,500);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

How do I create a digital signature to use when filling out applications online?

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I have four options: Browse for an existing digital ID file
Configure a roaming ID for use on this computer
Create a self-signed digital ID for use with Acrobat
Look for newly inserted hardware tokens

Formscentral does not support forms with digital signature workflows. I suggest you see if our Echosign product meets your needs.

How to create a time counter without using Sleep()?

I want to create a time counter that would count from 120 minutes and down. I thought about using Sleep() but I have found out that Sleep() is not accurate (so maybe the countdown would take 122 minutes instead of 120 minutes!). What other alternatives do
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The next experiment still uses Sleep and waits for approximately 12 seconds, displaying the time each second. However it is probably too overcomplicated compared to time polling:
const
int SECONDS_TO_WAIT =
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ULARGE_INTEGER ul_end;
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ul_end.LowPart = ft.dwLowDateTime;
ul_end.HighPart = ft.dwHighDateTime;
ul_end.QuadPart += 10LL *
1000 *
1000 * SECONDS_TO_WAIT;
for( ;; )
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GetSystemTimeAsFileTime( &ft );
ULARGE_INTEGER ul;
ul.LowPart = ft.dwLowDateTime;
ul.HighPart = ft.dwHighDateTime;
if( ul.QuadPart >= ul_end.QuadPart )
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FileTimeToSystemTime( &ft, &st );
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GetSystemTime( &st );
if( st.wMilliseconds >
500 )
FILETIME ft;
SystemTimeToFileTime( &st, &ft );
ULARGE_INTEGER ul;
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1000 *
1000;
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FileTimeToSystemTime( &ft, &st );
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How to create a standalone executable in LabVIEW 2009 Professional Development System?

How to create a standalone executable in LabVIEW 2009 Professional Development System?
Solved!
Go to Solution.

This should help you out http://zone.ni.com/devzone/cda/tut/p/id/3303
Also remember that quick search with Google in many cases will be quicker than asking in this forum. I always use Google before I ask for help in any forum. It is much quicker
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How to create a login interface in labview PDA module?

How to create a login interface in labview PDA module? So that it checks with a list of usernames and passwords and allow to go to another VI?
Anu

Anu,
I've attached a really short example that does something like what you're talking about. It just compares the user's username and password a pre-determined username and password and then "logs the user in" based on that comparison. Like Greycat said, you probably want to store this username and password info in some sort of file on the PDA that's in an encrypted format for both security and flexibility of your application.
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Attachments:
LoginVI.vi ‏17 KB

How to create a digital signature in adobe reader

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Adobe EchoSign supports #2.
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Is it possible to create user defined control in labview

in .net we can create user defined contol in which i can put more then one control and,, can use it as single control when needed,, but,, how this possible in labview,,
actually in my program i have a tab control and,, in that tab control there are 8 pages,, now there are 5 different kind option selection for each page lets say "a" "b" "c" "d" "e",,,,,.,. so,, when i select "a" configuration for tabpage 1 should show.. "a"(control collection) on tabpage1....and,, same should b possible for all 8 pages............................. this can possible if its possible to create user defined contorl in labview
while in .net its very easy task i m confused here,..,.
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Attachments:
tabcontrol.vi ‏1 KB

Hi,
I've tried to open you attachment but LabVIEW tells me it's not a vi... could you check it and repost please ?
I'm not really sure of what you need but you CAN customize you control in LabVIEW, it is not hard, you just have to know how it works
Sometimes being good at another programation language confuse you more than it helps because you try to do as you are used to... the difficulty it to "translate" functions from a language to another.
I do know how frustrating it can be when you think "Damned, it would take me only 5 minutes to do that with language a and after 10 hours with language b it is still not working "
You have to get in LabVIEW way of thinking, I wish you good luck !
A quick exemple... this might not do exactly what you need but it may help you anyway.
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
exemple.vi ‏55 KB

In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

If the other person will be using Reader, you should first add a digital signature field and then Reader enable the form. In Acrobat 10 you'd select: Tools > Forms > Edit
to get into form editing mode. You'd then select the signature field tool to add a signature field.
Once you have the document finalized, Reader-enable the document by selecting: File > Save As > Reader-Extended PDF > Enable Additional Features
being sure to save to a new file so you don't overwrite the original. If you don't Reader-enable, Reader users won't be able to digitally sign.

Can I create a digital id for electronic signatures in adobe reader for ipad?

Can I create a digital id for electronic signatures in adobe reader for ipad?

No, digital signatures are not supported in Reader for iOS.

How do I create jump to (page) links using DPS in creating a digital page turner for a catalog?

I know how to use "navto" to jump to pages within the catalog created for our app.
We want to use the same article files to create a digital page turner using DPS but cannot figure out how to do it. Google searches lead to answers that say it isn't possible, but if i view a page turner I created in 3D Issue via Adobe's Content Viewer, the pages jump (via the links I made in 3D Issue).
I just can't believe that a huge company like Adobe has no way to do this in DPS.

On pages you do not want to show-up delselect "include page in navigation menu" in the page inspector:

What are the tools to create a digital magazine for ipad version and how can be place it in newsstand?

Hello..
"what are the tools to create a digital magazine for ipad version and how can be place it in newsstand?"
I am very tired after done a week of R&D on this issue..
But i doesn't get any fair solution for this one..
I hope this is best option to place my issue here to get quick solution..
Thanks and Regards..

We are all users here.
There is no one here from Apple.
In order for you to develop and distribute content for the iPad, you need to become an apps developer.
Not sure where you sign up for this or who you have to call.
There should be a place on Apple's site that refers to a section of the site if you want to be an Apple iOS content developer.
It cost, I believe $99 U.S. to become an Apple apps developer. You'll agree to Apple's Non-disclosure rules. You'll receive Apple's app/software developers kit,and access to Apple's app developer site.
No one here is going to be able to help you.
Good Luck.

How do I create a digital ID?

How do I create a digital ID and signature

Hi barny hattey,
Kindly refer to this link:Adobe Acrobat X Standard * Digital IDs
Please let us know if you require further assistance.
Regards,
Florence

Creating a digital counter in labview

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