LabVIEW

cancel
Showing results for 
Search instead for 
Did you mean: 

Flash Leds

Hello,

 

I want to control the on / off of 3 leds.

 

led 1  led 2   led 3

on      off       off

off      on       off

off      off       on

 

Then repeat this sequence from a slow start and ramp up to say 3hz over say 20 seconds and then stay at that level untill stopped

 

Can anyone advise how this might be done ?   I would then like to use this to try and control a 3 ph stepper motor.

 

I am using Version 8.0 if any body can give me some example code to work on.

 

Labtech5555

0 Kudos
Message 1 of 10
(3,242 Views)

Try something like this, perhaps? Just plug in your desired numbers.

 

 

Message Edited by altenbach on 02-06-2009 12:19 PM
Message 2 of 10
(3,230 Views)

Hi Altenbach,

 

Thanks thats exactly what i am trying to do..Perfect.

 

Just to take things a little further i would like to plot the three led digital signals 0 or 1 ( True or False) seperately on a graph.

 

I have tried using digital waveform but as usual i always have major ploblems with data types and converting

or matching up data types for each Vi.

 

For this example the output from the array is a 1D Array of boolean (true or false).The Vi DWDT Boolean array to digital uses a 2D array.

Checked out the examples but still don't see how to make it work for this example.Tried converting boolean to 1 or 0 and using other graphing

Vi's  but still there is a data mis-match.

 

Any suggestions would be appreciated.

 

Labtech5555

 

0 Kudos
Message 3 of 10
(3,198 Views)

Since the points are not equally spaced in X, you would typically need an xy graph.

 

Another option would be to run a chart in a parallel loop at regular intervals and read the data via a local variable. See attach example.

Message 4 of 10
(3,179 Views)

Hi Altenbach,

 

The program below works exactly as planned but i want to modify to get another 3 combinations.Can you help for this combination of flashing Leds ?

I can't quite get it working..

 

I want to control the on / off of 3 leds for the 6 states below:

 

led 1  led 2   led 3

on      off       off

on      on       off

off      on       off

off      on       on

off      off       on

on      off       on

Then repeat

 

Thanks,

             Labtech5555

 

 

0 Kudos
Message 5 of 10
(3,097 Views)

You can create an array constant containing all of your combinations in order and iterate through them.

 

0 Kudos
Message 6 of 10
(3,084 Views)

Hi Ravens Fan,

 

Thanks for the solution it works as requested.

 

The problem i have is i have based the original code on a larger program i have written to control real Leds through a DIO card.

The original code was a 1D Array and i could feed this more or less directly to the card without any problems.The code you have

given me uses a 2D Array and i can't feed this directly to the card in the same way without changing alot of the other code i have.

I get an error with data types.

 

Is there another solution you can think of that uses a 1D Array or is there a way to convert the 2D data ?  

 

 

Labtech5555

 

0 Kudos
Message 7 of 10
(3,050 Views)

It's always a risk that when you start adding new requirements that you didn't originally plan for, you'll be forced to modify more code than you intended.Smiley Wink

 

Notice that I am only sending a 1-D array of the booleans to the indicator.  I'm using index array to get out a particular state of booleans (1-D array coming from 2-D array) on any give loop iteration.  I'm not saying you should be sending a 2D array directly to a card.

 

I can't comment on how you should handle it because I haven't seen our your program architecture is working now.

0 Kudos
Message 8 of 10
(3,041 Views)

From the Index Array output i am taking a wire to Boolean Array to Number ........from this output i can send this to my DIO Card

which outputs this as a Byte to the card output bits 0,1,2.

Unfortunately with this new version using the 2D array this set of wires brings up an error due to a data mismatch.

 

Thanks for your help.

 

Labtech5555

0 Kudos
Message 9 of 10
(3,021 Views)

As I said, there is nothing I can comment on unless I see your code.

 

Preferably the VI itself and not just a screen shot so I can play with it.

Message Edited by Ravens Fan on 03-03-2009 04:49 PM
0 Kudos
Message 10 of 10
(3,017 Views)