pwm labview using NI USB 6251

[ZelDrums]

Hello I´m new in LabVIEW

I would like to generate 3 PWM signals using NI USB 6251, but I have only 2 counters..
I use the example of LabVIEW of this link http://www.ni.com/tutorial/2991/en/
but how can I generate the other pwm?
Besides I need to generate a specific number of pulses like 10
How can I do that? and how can I show the pulse in a waveform
Thanks!

[GerdW]

Hi ZelDrums,

sounds like you bought the wrong DAQ hardware for your task!

Which frequencies are we talking about? For low frequencies you could use software timing to generate a PWM: switch on/off a digital output pin with some delay in between…

Besides I need to generate a specific number of pulses like 10 How can I do that?

Well, generate a signal (aka waveform) consisting of your ten pulses. There are a lot of signal generation functions!

and how can I show the pulse in a waveform

Please use proper LabVIEW terms. You probably want to show your signal (aka waveform) in a chart or graph: just wire your waveform to an indicator of your choice!

[ZelDrums]

I didn´t buy the wrong DAQ hardware, I already had that hardware 

but I found an example whe resolve my problem like send a number of pulses, I didn´t explain well  

my ask was if is possible to generate a pwm without using  counters? 

Thanks! 

[GerdW]

Hi Zel,

yes, it's possible. I already told you so…

[ZelDrums]

there will be some example that can explain  to me a little about how to do it?
thanks!!

[GerdW]

Hi Zel,

what's the problem with switching a DigitalOutput on and off with some delays in between?

Pseudocode:

repeat
  switch DO on
  wait (high time)
  switch DO off
  wait (low time)
until break

The same as snippet:

You will find examples with the example finder and by searching in this forum…