How to write to file at user defined interval

Hello
I am trying to find a way to take data samples from a stream of strain measurements that is input to Labview from a NI 9237. These samples must be written to a file for later analysis. The vi must be capable of recording a burst of data at a user defined interval and sampling rate.
For example record at 10Hz for 10 seconds every 15 minutes.
My attempt at doing this is attached (as you can probably tell see I am quite a beginner at Labview).
In my example I have used a random generator to simulate my data from the NI 9237. By using a for loop I have tried to get the vi to write 5 data points to the file. However it writes the same data point to the file 5 times, instead of 5 successive data points.
Ultimately I would like the vi to write data to the file for a period of time (10 seconds) instead of writing a defined number of data points.
Can anyone please advise how I should go about achieving this?
Many thanks
Solved!
Go to Solution.

I would create a separate task which is used to write the data. Data to be written to the file can be passed to this task via a queue. You could set values to determine how much data needs to be written and at what intervals. Your data acquisition can post data to the queue. Your queue can be configured so that it will only contain enough entries to hold the amount of burst data you want to save. Any additional data posted to the queue would be dropped. Your write task could be in a loop that periodically checks to see if your time interval has been met. When it does it can dequeue all the elements from the queue and write them to the file. It will go back to waiting for the timer to expire. Now that the queue is empty your data acquisition will be able to fill it again with the next set of data.
NOTE: When you have your logger task pull the data from the queue you should use the queue status vi to grab all of the data at once and then flush it. If you dequeue elements one at a time in a loop your data acquisition task will start filling it again before you have written everything out. This would result in more data getting written to file than you want.
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