Jeyjey

Hi Guru,

That is exactly what I want to do. Thank you for the advice.

I will have a go at doing this.

Each graph will be updating at an interval of 1 data-point per second. So I pretty much want the X-axis (time) to be increasing until it shows the whole 28 days worth of data-points. I believe this won't be an issue?

Hello,

I am about to start a project where I need to be able to view a force-displacement, force-time and displacement-time graph on the DAQfactory software. I will have 3 x Labjack T7 to set up 9 stations. So I will be looking at 3 graphs per station which mean I will have a maximum of 27 graphs running in the software. I need to be able to test up to 28 days (data-logging and graphing) and it could sometimes be with multiple stations simultaneously. I primarily want to press a button and start the testing, then all the graphing from the start till the end (up to 28 days) needs to be viewable on the page. Do you see this as a limitation in the software?

Look forward to hearing from you.

Thank you!

Thank you for the code!

I will try this code and play around with it to match my application.

I'll let you know how it turns out in the next few days.

So I have 3 digital outputs set on DF linked to Labjack (Pump, Solenoid 1 and Solenoid 2)

Initially the pump is activated with a button on the DF page. If solenoid 1 and 2 are not active for a minute (just an example), I want to be able to turn off the pump with a timer (1 minute). If either of the solenoids turn on while the pump is off, I would like the pump to turn on again. Do you have a solution to this scenario?

Any assistance is appreciated.

See below the section of my rough script:

if ((Up[0] == 0) && (Down[0] == 0))     //if solenoid is OFF for more than a minute, turn off pump
         

         starttime = systime()
         tim = systime() - starttime                                              

         if (tim >= 60)                             //1800 seconds = 30mins * 60sec

                                                            //60 seconds = 1min x 60sec
            APump = 0                            //turn OFF pump command    
         
        endif

 
      else

         tim = 0
         starttime = 0
         APump = 1
         
      endif

endif

Thank you so much! 

That makes a lot of sense. The issue is resolved now after I renamed those variables.

Hello,

I'm trying to control my DO channels I have set up while I have a script running, but for some reason my digital out is not changing state on my Labjack U6 (measured with multi meter).

However, I noticed that the DO state changes on the Labjack when I start DF software without the script running (controlled through the "command/alert" window). It almost looks like it loses connection with the Labjack when I begin the sequence every time.

Note: I am able to visually see the state change on the page I have set up. The issue is only on the labjack side of things. Wondering if I am doing something wrong in my scripting.

Attached is the file I am working on. Would you be able to give me some clarity on this issue I a having?

Universal Tester.ctl

Thanks Guru, I will do some reading into the web service and hardware you mentioned.

Hello,

So I have an application where there are 8 x fieldloggers where each unit is logging 12 x thermocouple data.

Ultimate goal is to be able to log live data coming through the fieldlogger. Logging will be in 30 second intervals for for 7 days periods (in rare cases up to 120 days).

Some important points are that the system plots to the system time so I can go back and view data at specific date and time in the graph. In addition, to view the graphing data on the web so anyone can view live readings from anywhere.

Can this be done through DAQFactory? If so please point me in the right direction to begin. I would Like to work with the express version until it is confirmed that this can be done.

Thank you for the assistance!

I already had a expression in my conversions, hence I hesitated to add what you have shown me. The expression is "(Value*50)-LoadCellTare"

However, I will try to implement what you have provided now.

Thank you so much for your assistance Guru!

Hi Guru,

So I tried that and it worked but that equation didn't really help much in terms of filtering.

I was trying a few other things and came up with some questions. I have a channel called "Force".

I was trying to add a deadband to that channel with some sequencing so that I can just display and log "0" when there is no load. I did something like this:

While(1)

   if (Force[0] < -0.5)

       Force [0] = Force[0] * -1

   elseif (Force[0] > 0.5)

        Force[0] = Force[0] *1

   else

        Force[0] = 0

   endif

endwhile

But I noticed that this part of the code was not being executed. Why might that be? Please note that I also tried to initialising "Force[0]" as a global variable.

The reason I want to do this in my sequencing is because I also want to log and graph the results. Any help will be appreciated.

Thanks You!

On 5/2/2020 at 3:12 AM, AzeoTech said:

Well, my first thought would be, yes, you can simply use averaging by oversampling.  Sample the LabJack at 0.01 seconds then average 10 readings into 1.

But implementing your function is not hard.  Just use a conversion.  I'm assuming filter_coefficient is a constant, but what is "filtered analog"?  You have it on both sides of the equation.

Oversampling is not able to provide the filtering I need as I can still see some noise. Also I will be changing the sample time anywhere from 0.1-10 seconds which can make things even more complicated to try this method.

I have included the function in my scripting and also tried in my conversion. But I believe the problem is that this equation requires the output (filtered analog) to be part of the input. Hence that is why I have the same variable on both sides of the equation. This is an IIR filtering equation that is very commonly used in other coding platforms. I don't see any other way to solve my problem via DAQFactory. I think it might be the hardware I am using that is causing the issue. To be specific, my Signal Conditioner.

Hey! So I'm using DF Express to measure some Load Cell Data. Through a LabJack U6-Pro.

I'm using a 0-500kg load cell and trying to get a resolution of almost 1-5 grams. However, I noticed there is a little bit of noise which I believe could be filtered with an equation like this:

Filtered Analog = (filter_coefficient x Analog Input) + ((1 - filter_coefficient) x filtered analog)

How could I implement this in DAQFactory or would you suggest a different method? Also to keep in mind that I am plotting these values in a graph, logging them, and also grabbing the data every 0.1 seconds. Hence I cannot simply use the averaging function from DAQFactory.