Arduino signal to labview (HELP!)

[GerdW]

Hi lamela,

DecimalStringToFloat doesn't like strings starting with text (like "mV = "). Reading the LabVIEW help might be useful in your case 🙂

And I still don't see any LFs in your received string…

[dmsilev]

Replacing Serial.print() with Serial.println() in the Ardunio code will add a \n to the end of the transmitted string.

[lamela]

Thanks for the replies!

Can you tell me these in step by step? Thank you!

[Dennis_Knutson]

In the sketch, replace print with prinln. This does not take much skill. Did you write the sketch yourself or copy it from somewhere? Have you studied the arduino programming language at all?

[lamela]

I've done that but the wavechart is still showing spikes?

The reading from the double precision float will also go back to 0 after displaying the correct reading?

[Dennis_Knutson]

And did you get rid of the incorrect during to number conversion? You did not show your block diagram.

[lamela]

Here is it! So I have to remove the decimal string to number conversion?

[GerdW]

Hi lamela,

So I have to remove the decimal string to number conversion?

No, we never told you so…

But we told you to read the help for that function and to "clean up" your string before trying to convert to number that way!

Here is it!

You still use BytesAtPort! Why don't you work with a TermChar as has been discussed in several posts by now?

[lamela]

Ok. I've added termchar but I'm still unsure of the function.. Is it something like this?

What should be corrected here?

[GerdW]

Hi lamela,

Ok.. I've added termchar

So why do you add that TermChar twice? (SerialPortInit and this property node?

Why do you set the TermChar to "0" at SerialPortInit?

Why do you set the TermChar to "termchar" in the loop? Why do you tolerate a coercion dot for this input?

Why do you set the termchar in each iteration of the loop?

Did you study the example VIs coming with LabVIEW at all?

I'm still unsure of the function

Which function do you talk about?

Is it something like this?

Well, you still don't parse your string correctly. How does the string look like before number conversion? What is the result of the conversion? Did you use probes to check all this?

The NumericConversion function expect a string, which ONLY consists of numbers. It does NOT handle anything else and will not handle any equal signs or unit strings!

To give you an idea of what might work:

(This snippet expects a LF as termchar!)