How to convert a analog signal to digital signal

[stefan57]

Hello,

How to convert an analog signal into digital signal such that every sample of analog signal corresponding to 1.2V will be represented as '1' in digital signal and other samples of analog signal(that are not 1.2v) will be represented(converted) as '0' in digital signal.

And how to display both wavefroms or signals in graph indicators.

Thanks.

[crossrulz]

You need to choose a threshold to what is considered a 1 and 0.  Sounds like you chose 1.2V.  So just take your array and use the Greater Or Equal? function to compare all of your elements to 1.2.  You can then use the Boolean to 0,1 function to change to a 0 or 1.

[P@Anand]

Use the "In Range and Coerce" primitive and feed the Value and for max and min set 1.2V +/- 0.2 or something to have a threshold. So if it is around 1.2 you will get "High" else you will get "low" boolean values. If you still want 0 or 1 out of it, then wire the boolean to "Boolean to (0,1)" primitive.

Edit: Tim, you are way to fast. 🙂

[Hooovahh]

As posted by the cheat previously a better solution for a noise signal is to use a two level threshold.

http://forums.ni.com/t5/LabVIEW/Two-Threshold-Analog-to-Digital/td-p/2738762

[crossrulz]

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@Hooovahh wrote:

As posted by the cheat previously a better solution for a noise signal is to use a two level threshold.

http://forums.ni.com/t5/LabVIEW/Two-Threshold-Analog-to-Digital/td-p/2738762

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I forgot about that thread.  That was a fun little thing to get working.

[stefan57]

Hi,

With your suggestions I tried like this but I don’t know how to get a continuous digital sqaure signal (waveform) plot of the converted analog waveform.

Can anyone help me to the required?

[altenbach]

You are reducing 1000 samples to a single scalar. You probably should operate on all 1000 elements at each iterations of the loop.

[stefan57]

I tried with a "collector" by taking 1000 samples but was unable to get the digital(sqaure pulses) waveform.

[GerdW]

Hi Stefan,

please go through all available online courses for LabVIEW. NI offers a lot of them!

When you want to learn LabVIEW you should stay away from ExpressVIs and the DDT…

[Hooovahh · Accepted solution]

If you have 1000 samples, and you want to convert to digital, you are going to get 1000 digital values.  Attached is what I mean.