Is it possible to capture image at specified wavelength​s

Question

The filter is attached to camera. The filter is switching betweeen   5 specified wavelengths. On giving the "Start Aquisition" button the camera will capture image. the problems are
1)  the wavelength selection is written as  subvi. It changes the wavelengths , but the control returns to the calling vi only with the final wavlength( here 686.7). The other values are not reflected in the main vi.
2)  on giving the "start aquisition" the image taken is for this final wavelength. Is it possible to take images for all the 5 wavelengths by giving "start aquisition" only at the beginning?
3)  Now the execution control loops inside the section which captures the image( since I have given a while loop there)
4) instead of this sub filter vi, is it possible to add a sweep program( i already have one) so that when the desired wavelength values come it will capture the image.
Attachments:
image changed2.vi ‏251 KB
subfilter.vi ‏22 KB
sweep.vi ‏22 KB

Answer 1

Your code shows a complete lack of understanding of dataflow programming. Maybe you should start out with a few tutorials and study some example programs from the example finder.
How are you running the code? Run continuously??? There is no toplevel loop! It is difficult to say more, because most subVIs are missing so we cannot even test.
Your toplevel is unmaintainable, with loops and sequence structures stacked knee deep. Have a look at state machine architecture instead. Your only seem to work if controls are operated in a specific sequence. Most of the time, controls will not respond because the code does something else.
Your "sweep program makes no sense. Why are you setting a value property that overwrites a control, making the control useless. Only use controls if the user can actually change something. Why not just initialize the shift register with a diagram constant of 400? After you do that, the sequence structure is obsolete, delete it. Why is there a local variable? Why don't you delete the local variable and place the indicator in its place inside the loop? 
Your subfilter code makes no sense. Nothing will happen in the main VI while it is running. Data is only returned at the output terminal once the VI is finished. It does not change any wavelenghts as you claim, it simply updates it's front panel. What else do you expect? Why don't you flatten that code in the main VI, simply autoindexing an array with three wavelents in the loop that does the acquisition. Why does the output go to a case strucure with only choices 0 and 1? Since none of the outputs will ever be 0 or 1, only the empty default case will ever execute.
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