Storing minutes in an array

[Labwizard]

I am logging data from sensors and a balance every one minute. I need an array column which displays the Elapsed Time in minutes as below.The time starts at 0 min and increments 1 for every minute

Time

0

1

2

3

4

5

6

7

8

9

10

How can I implement this?

[ZYOng]

There are many ways to do it. You can just play around with Array and Comparison palettes. 

[Bob_Schor]

Maybe you should consider changing your Forum "handle".

• Do you know that LabVIEW treats "time" as a data type, has Controls and Indicators just "made" for Time, and has an entire top-level Palette for Time functions?
• Do you know how to do things "over and over again until I say 'Stop'"?
• Do you know the relationship between milliseconds, seconds, and minutes?
• Have you tried to make a little VI that would count "1, 2, 3" at the rate of 1 per second?  [This is easier to see in action].  If you got this to work, do you know how to make it run at the rate of 1 per minute?

If you want to learn how to program, you almost have to try to write programs.  Best to start with really simple things like creating a VI that "does something once a minute"...

Bob Schor

[Labwizard]

Yes...I can make it log data once every minute...but I am not sure how to log the elapsed time in minutes in an array

[altenbach]

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@Labwizard wrote:

Yes...I can make it log data once every minute...but I am not sure how to log the elapsed time in minutes in an array

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If the loop runs once per minute, you can calculate the time from the iteration terminal, no need to measure it.

(A loop time of 1 minute is a bad idea, because the controls will also only get read once per minute, so use a simple state machine instead where you conditionally append when the time is up.).

All you need is start with an empty array in a shift register and use build array to append the new element. If this is not clear, maybe start with a few basic LabVIEW tutorials.

In your case, the "time" is identical to the index of the logged value. Assuming you log every value to a file, all you need is also log the index. no need to built arrays in memory with redundant information.

[Labwizard]

I just used an elapsed timer and divided the seconds by 60 and stored the values everytime another elapsed timer resetted at 60 seconds using a condition =0 & >=60 to a case structure.

[altenbach]

If you know the loop rate, there is absolutely no need to measure relative time, ever.