How do I set the amplitude of complete pwm example?

[invasion2121]

I have successfully downloaded and executed the sample program shown here:

http://www.ni.com/white-paper/2991/en

and see the pulse train generate in my oscilloscope.  When measuring the value of a pulse high, the oscilloscope says 5V. 

How do I change it to 3?

Looking at the DAQ Create Channel node I don't see any inputs for amplitude, only frequency and duty cycle.

Where is the amplitude of 5volts being set and how can I change it to 3V?

[AnalogKid2DigitalMan]

Counter outputs are typically TTL level (~0-5V) and cannot be changed programatically.

You could use a resistive divider to scale it down to 3V.

-AK2DM

[invasion2121]

Are you suggesting I feed the counter output into a breadboard and then use two resistors in a voltage divider circuit to get my 3V?

Also, is there any other way to do this besides using counters? Is it possible to use Analog Output? If so, is there an example?

[AnalogKid2DigitalMan]

I modified one of Analog Output the shipping examples, adding a duty cycle and offset control.

-AK2DM (applies well here!)

[AnalogKid2DigitalMan]

Did not attach, trying again.

Cant attach 😞

Search examples for: Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi and add controls for duty cycle and offset and adjust as needed to get your desired waveform.

-AK2DM

[invasion2121]

Hi AK2DM -

Are you talking about this:

https://decibel.ni.com/content/docs/DOC-3545

I will certainly try this out when I get to my lab and make another posting.

This may be a stupid question, but does this function get generated in hardware or software? I prefer hardware because it's supposed to be more exact.

[AnalogKid2DigitalMan · Accepted solution]

Very similar. On the icons above the step 5 text box, you have to right click on the appropriate terminals to add controls for Offset and Duty Cycle.

Timing/generation is done via hardware in this case.

-AK2DM

[AnalogKid2DigitalMan]

Still can't attach, egh, probably my outdated browser, never had this issue before.

-AK2DM