How to switch between two values at a given frequency.

[Ketelsen11]

Hi

I am new to LabView, so this is probably a pretty easy task for you guys. 

I want to switch between two specified values at an given frequency in a while loop. 

I am using LabView to construct a PWM-signal, and I wanna switch the PWM signal between two values at say 10khz. 

Besides; is it possibly to change value this rapidly? Is there a limit, regarding either Labview software or the communitation between PC and hardware? 

[camerond]

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@Ketelsen11 wrote:

Hi

I am new to LabView, so this is probably a pretty easy task for you guys. 

I want to switch between two specified values at an given frequency in a while loop. 

I am using LabView to construct a PWM-signal, and I wanna switch the PWM signal between two values at say 10khz. 

Besides; is it possibly to change value this rapidly? Is there a limit, regarding either Labview software or the communitation between PC and hardware? 

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To answer your questions first: Yes, sure. There has to be a limit somewhere, but it depends primarily on your hardware, at least at this speed.

Then to answer your non-questions: Good, it should be entirely possible, but you'll have to know something about LabVIEW (notice the spelling). I'd suggest you start by working through the free tutorials I stole the links for and put in my signature. Now, I've suggested to many people to go there, but haven't really gotten any feedback. If/when you finish them, please let me know if they were helpful. Thanks.

Cameron

[Yamaeda]

If you have a NiDAQ with a counter output it's really simple, just look at Help -> Find examples for Generate counter signals.

/Y

[A.E.M]

Hi Ketelsen11

Welcome to the forum 🐵

I'm not sure if you have any hardware, or if you are just trying to achieve something in the software. If you are using DAQmx to generate a PWM signal, and you have a counter module, then it is as easy as just following this guide:

Pulse Width Modulation (PWM) Using NI-DAQmx and LabVIEW

If you want to do a pure software solution, you can add a wait function in your loop to control the loop rate:

Software Timed Loops using Wait (ms) and Wait Until Next ms Multiple

Let me know if you have any further questions.