generating step waveform

[Jenna]

Hi, I am trying to generate a step waveform from 0 to 5V out of AO channel, each step is around 0.03V, and stays for 600ms on every step, therefore there are hundreds of steps, I will have to use loop functions. I tried using insert array VI to append all the arrays from every step, but it only gives me the final step voltage of the loop for the whole time. I did find a step function VI in Math, but couldn't figure out how to use it. Does anybody have any idea or example for this kind of application? Thank you in advance!

Regards,
Jenna

[CoastalMaineBird]

Take a WHILE loop and add a shift register.

Initialize the shift reg with 0.0 (the initial value).

Inside the loop wire the left shift register through the right side of the loop to make a tunnel.

Pop up on the tunnel and turn on auto-indexing.

Inside the loop take the left Shift reg, and add your step (0.03) to it.

Wire the result to the right-side of the shift reg.

Compare the result to your end limit. Stop the loop if sum > limit.

Use the array from the auto-indexing tunnel as your ramp function - plot it on a graph to make sure it's what you want.

[chutla]

Hi Jenna:

Couldn't be much simpler. Look at the attached vi.

Good luck!

Eric

[Oleg]

Hi,
another way is to use the combination of "Functions->Analyze->Signal Processing->Signal Generation-Ramp pattern.vi" with "Round" function.

The example is attached.

Good luck.

Oleg Chtuko.

[chutla]

This is also very good too! By the way...if you use the waveform graph to check if this is working, be SURE to turn off the linear interpolation!!!! Otherwise, all you'll see is a ramp, and you'll think the vi is broken, when it's working just fine. This drove me bananas for days on another vi i was working on!

Eric

[Jenna]

Hi chula and Oleg,

Thank both of your suggestion and examples, I have got it running successful with my application now. Thanks a lot for your help!

Regards,
Jenna

[chutla]

Your bill is in the mail. 🙂

[wha@atmel]

Hi Oleg,

let me add an example - with little "show...."


regards
Werner