How can i measure only the valley voltages of a sine wave in labview 7 express evaluation version?

I am trying to convince my company to send me to purchase labview and send me to classes for labview.
I am trying to put together a small demo for them using the Labview 7 express evaluatin copy that I recieved.
What I am wondering is how can filter out everything besides the valley peaks on a sine wave.
What I am trying to accomplish, is create an example showing that Labview can sameple from a sine wave, read about 5 "valley" points of the wave, evaluate these based on a value that i can define, and signal pass or fail.
attached is a picture of what i have so far
Ryan
LV 7.1
Attachments:
progress.bmp ‏3841 KB

Hi,
I built a VI using LabVIEW 7.0 that detects the valleys in a sine wave. It uses the 'Peak detector' VI that I believe is available in the evaluation version.
(Functions palette >> All Functions >> Analyze >> Signal Processing >> Time Domain >> Peak Detector)
I have attached a VI as well as the screen shots its front panel and block diagram.
I hope this helps.
Sincerely,
Feroz
Attachments:
valley_detector_bd.jpg ‏36 KB
valley_detector_fp.jpg ‏72 KB
valley_detector.vi ‏29 KB

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