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how to trigger from analog input channel

Hi all,

 

I am currently working on a data acquisition project with myRio.  I am acquiring a signal and filtering out the non-wanted frequencies.  I want to trigger an alarm when I get approximately a 40kHz frequency.  The alarm will either be an LED or a sound alarm.  I am planning on triggering the alarm when the voltage level is above a certain point but I am unsure how to go about this.   

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Hi,

 

This is a pretty old forum, as it hasn't been touched since around 2011. I would suggest posting a new forum in the myRIO section here http://forums.ni.com/t5/Academic-Hardware-Products-ELVIS/bd-p/10. 

 

But if you simply do a comparison inside the loop you're reading (meaning a "greater than" with your comparison) and then if it's true you can trigger a case structure or simply a "Select" function. 

 

Again though, I'd post on the myRIO forum so that way your post shows up under the right hardware category and is more visible to everyone. 

Daniel Parrott
Software Product Marketing - Data Management & LabVIEW
National Instruments
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