Labview signal goes below 0?

[lamela]

Hello guys! My signal from the arduino to labview is supposed to go from around -3 to +4, AC signal at the 0 point. But sometimes, the signal I get will all be negative values below the 0 point. Why is this so?

[GerdW]

Hi lamela,

this seems (very) related to your other thread(s)! So why do you create a new thread with the very same VI of the other thread?

Why is this so?

After all the responses you got over there you should have known how to include some error checking!

And you should have removed the silly DDT wire by now…

[lamela]

I done that and I realized the signal will sometimes stay for a period of time before changing to the correct reading.. I'm fine with it but is there a way to reset or continuously updating the signal so I don't have to stop and wait before running the program again?

Addon: everytime I run the program, the signal will show a spike or some buffering signal for the first 1-2 sec before displaying the AC signal. Is there a way to get rid of the spikes whenever I stop and run the program?

[lamela]

Sorry, I think the spike cannot be solved but how can I make the readings and signal run continuously? Let's say when I change the load and run, I'll always have to stop the program and maybe wait for 15-20secs before the reading and signal update. How can I make it update? Or maybe reset the whole program automatically after a period of time?

[GerdW]

Hi lamela,

get the communication with your device working stable - as has been discussed in your other thread!

[lamela]

Hahaha I just realized the the signal was too slow to update. But if I decrease the delay, the signal will update after around 10secs!

[GerdW]

As there is no question (and no VI attached) I guess the problem is solved!?