One button with 3 or more cases

[geneclaude]

So we were asked to reproduce the function generator and oscilloscope as a virtual instrument for our final exam. But I'd like to focus on the function generator. The audio generator GW Instek GAG-809/810 has only a single button for the waveform wherein the user would just press it repeatedly to show the desired waveform (i.e., sine wave, square wave). Yeap, the audio generator only have the two waveform but our professor wanted us to add the generator's feature, that is, for the users to be able to display the wave into sawtooth and triangle wave.

So how do we construct it, that different wave forms would display everytime we press the button?

[GerdW]

Hi geneclaude,

you could start using an Enum control when it comes just for the functionality.

Otherwise you may use a boolean button, check for rising edges (or use value change events) to count up an additional enum holding the waveform mode…

[kbbersch]

You need to use the Boolean as a toggle that will step to a different waveform each time it's pressed.

Something like this:

Of course, this is an example that needs a lot of work.

[JÞB]

Nice Kelly

Don't forget to type def that enum!

[kbbersch]

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Don't forget to type def that enum!

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Yeah, I meant it when I said it needs work.  The enum needs to be a type def and this really should feed a producer/consumer or something like that.  I just threw that togeather to give the OP a starting point.

[apok]

i was thinking.....

[kbbersch]

That works, too, except there are four waveform types not three (Sine, Square, Triangle, Sawtooh) so the constant should be a 3 instead of a 2.  The concept is very good.

[apok]

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@kbbersch wrote:

That works, too, except there are four waveform types not three (Sine, Square, Triangle, Sawtooh) so the constant should be a 3 instead of a 2.  The concept is very good.

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you got the jist of it....  

actually, 4 waveforms (0,1,2,3)...constant should be 4

[JÞB]

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@apok wrote:

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@kbbersch wrote:

That works, too, except there are four waveform types not three (Sine, Square, Triangle, Sawtooh) so the constant should be a 3 instead of a 2.  The concept is very good.

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you got the jist of it....  

actually, 4 waveforms (0,1,2,3)...constant should be 4

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Guys... Ahem ... Constant?  P-Node Num.Elements

Go to it !

[kbbersch]

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apok wrote:

actually, 4 waveforms (0,1,2,3)...constant should be 4

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Constant should be the highest number we expect to see, which is 3 or number of elements -1, since the first element is value 0.