How to use waveform to control LED?

[shasv]

Hello,

I am new to LabVIEW. I have had some success with blinking a LED and controlling LED based on cursor position.

However, I now want to control LED based on PWM. I know there are some PWM examples to control LED but they are not what I am looking for.

I would like to control LED based on the signal I have generated (please see the attached image). While the signal is high (at 5 in this case), the LED should turn on and while is signal is low (0 in this case), the LED should turn off.

I was able to obtain a 1D boolean array from the waveform but the LED accepts only Boolean but not an array. I am unable to understand this because I imagined that with an array, I will be able to turn on and off based on the signal. I intend to control the LED using an Arduino Uno.

Can someone please help?

Best regards,

Shashank

P.S: Attached sketch does not contain the Arduino part.

[PalanivelThiruvenkadam]

If you are sure that your values will be 0 or 5 then use select switch if the value is 0 then provide FALSE to LED Indicator else TRUE to LED Indicator

[bharathp10]

you're almost there.. pass your Boolean array through for loop and attach to boolean

[shasv]

Dear Mr. Thiruvenkadam,

Thank you for your reply. I had tried to connect the waveform to a switch, but that ends up in an error: "You have connected two terminals of different types".

[shasv]

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@bharathp10 wrote:

you're almost there.. pass your Boolean array through for loop and attach to boolean

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Dear Bharathp10,

do you mean something like the attached image? It still doesn't work.

[GerdW]

Hi shasv,

a simple example how you could handle arrays:

Dear Bharathp10,

do you mean something like the attached image? It still doesn't work.

What's the point in connecting a waveform to the iteration count input of the FOR loop?

What's the point in analyzing the iteration counter to driver the LED - when you want to output this waveform???

[shasv]

Dear GerdW,

This is exactly what I was looking for. Please excuse my mistake with FOR loop. I do not have any background in programming.

Thank you very much.

Best,

Shashank

[shasv]

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@GerdW wrote:

Hi shasv,

a simple example how you could handle arrays:

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Dear GerdW,

I noticed that the LED blinking is erratic and is not according to the waveform. For example, at1 Hz and 50% duty cycle, the LED just keeps blinking with short moments where it is off. It is the same if I change to 20% duty cycle. 

Do you observe the same behavior? 

[GerdW]

Hi shasv,

as I wrote, it's a simple example!

There is no timing at all in the loop. When you need the timing in the loop, you need to program it (in the loop)…

[shasv]

Hi GerdW,

Yes, I realized this through the 'highlight execution'. The LED actually follows the waveform, just that the timing is weird. I am trying to learn more about it.

Thank you very much for your responses.

Best regards,

Shashank