topic Re: Read number of readings taken in LabVIEW

Visible button after two readings

Aniketgawande — Fri, 25 Sep 2020 19:07:00 GMT

Hi...

I am student and new to labview. I need help in exploring labview.

I need small program

I have one button "done" and i have one numerical controller in vi. Now i want to show "done" button after taking two values in controller...means after taking two values in controller "done" button should be visible...can anyone help me this. I am glad if you give .vi for example. Thank you in advance

Re: Visible button after two readings

GerdW — Fri, 25 Sep 2020 19:24:15 GMT

Hi ani,

from your description I guess you need a loop, a case structure and a property node of the button...

All the rest is explained in those Training resources, offered in the header of the LabVIEW board!

(In general this forum is not providing homework solutions for free.)

Re: Visible button after two readings

altenbach — Fri, 25 Sep 2020 19:58:18 GMT

Looks like your program is complete, except for the visibility function. How do you count the number of values entered? Turn that into a boolean that turns true once the count is >1 and wire it to a "visible" property of the button.

If you would attach your VI, we could give you further useful advice.

(It is typically not a good idea to micromanage what the user can do at any given point in time. What if he decides that on reading is sufficient and wants to proceed?)

Re: Visible button after two readings

Aniketgawande — Sat, 26 Sep 2020 02:45:00 GMT

Thank you for both replays.

Basically, i am thinking to store numeric control readings in array and from that find size of array. And then give if condition to it means if array size becomes more that one visible button node becomes true otherwise it is false. True and false by creating constants to visible button node.

But again how to give that more than one condition? is big question

What ever i said above is in the word form i dont know how to program it in LabView.

It would be great if you help me in this.

Again thank you in advanced

Re: Visible button after two readings

altenbach — Sat, 26 Sep 2020 02:47:50 GMT

Look in the comparison palette.

Have a look at the training resources at the top of the forum if you want to do this in LabVIEW. Who forces you?

Re: Visible button after two readings

Aniketgawande — Sat, 26 Sep 2020 02:56:24 GMT

No one forcing me. But this is something which is not letting me to sleep.

Thank you for your help.

You can add if you get something related to this

Re: Visible button after two readings

altenbach — Sat, 26 Sep 2020 03:34:10 GMT

@Aniketgawande wrote:

But this is something which is not letting me to sleep.

A good way to keep busy while awake would be to go through the mentioned tutorials. Have you tried?

Re: Visible button after two readings

Aniketgawande — Sat, 26 Sep 2020 04:17:17 GMT

Not tried yet....but i will go through that.

Read number of readings taken

Aniketgawande — Sat, 26 Sep 2020 07:35:53 GMT

Is there any way to find out how many readings taken by numeric controller?

Means if i am taking 34,56,89 values in my numeric controller then way to indicate 3 values taken?

Thank you in advanced

Re: Read number of readings taken

GerdW — Sat, 26 Sep 2020 08:58:49 GMT

Ho ani,

are you talking about a FP control?

Use an event structure to count the value change events for this control...

Re: Read number of readings taken

RavensFan — Sat, 26 Sep 2020 14:42:33 GMT

This seems to be related to the topic of your original thread.

I've moved your message there so anyone reading it has the benefit of the previous conversation.

Re: Read number of readings taken

altenbach — Sat, 26 Sep 2020 17:15:20 GMT

@Aniketgawande wrote:

Is there any way to find out how many readings taken by numeric controller?

Means if i am taking 34,56,89 values in my numeric controller then way to indicate 3 values taken?

I assume you are talking about a numeric "control" on the front panel. (A "controller" is typically something else).

As a first step, you need to define the term "reading". If this control is inside a loop that e.g. spins at 100Hz, the control will get read 100x per second, no matter if the value changes or not. You could count how many times the value changes, but sometimes successive valid reading could be the same by coincidence. You need to define a mechanism that exactly defines what a "new reading" means. One could add an OK button to define a new reading. (start here and add a counter. If nothing else spins the loop, you can even derived the count from the iteration terminal (not recommended)). You could append each reading to an array and look at the size of the array.

Computer programs will do exactly what you want, but you need to exactly define what you actually want.

Re: Read number of readings taken

Aniketgawande — Sat, 26 Sep 2020 19:04:36 GMT

Thank you for your valuable suggestions.

Yes i am using numeric controller of front panel inside a while loop. I used array method to find size but that didnt worked.

But must say all suggestions helped me a lot

Re: Read number of readings taken

altenbach — Sat, 26 Sep 2020 19:58:13 GMT

@Aniketgawande wrote:

I used array method to find size but that didnt worked.

I am sure that if you show us what you tried, we can suggest how to fix it so it works. 😉