How to enable 2 or more analog input pin in arduino uno labview simultaneously for voltage analysis?
Hi everyone,
i am new to labview and using arduino uno board for measuring microwave analysis in my project. i want to measure the refflection coefficient by dividing two analog input received to arduino (Vref and Vin) to obtain so. problems come where i just can analyze only one analog input pin only. please, kindly helped to figure it out.i've try the others solution where i create two while loops for different analog pin. u can refer to my circuit in the attachment below.i really2 appreciate ur help, thank you.=)
Attachments:
reflection coefficient and Vswr.vi 665 KB
front panel.PNG 66 KB
block diagram.PNG 40 KB
Try this if you have a POT around hook it up to the arduino than use the AnalogInSerial.pde and load it to your arduino exit out of the arduino platform and than try my VI see if this helps you.
Harold Timmis
[email protected]
Orlando,Fl
*Kudos always welcome
Attachments:
TalkToArduino.vi 28 KB
Similar Messages
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How do I use a daq analog input value to output a voltage based on if/then statements?
I am the first one here to start using labview and am not familiar with any of it. I am pressed for time and need simple solutions to accquire two analog signals from turbidimeters in volts and use them to turn an alum pump on or off in order to automate a pilot water treatment plant. If someone could correspond with me via email or instant messaging, I would greatly appreciate the assistance. I recognize the power of labview but have been tinkering with it for a week now and have no luck producing results. I do not know if there is already a VI out there that does this, but that would be a tremendous help. Again, someone to correspond with would be the ideal solution.
Thank
s,
JackBasically the job isn't very difficult. All you have to do is use the built-in comparison fucntions to generate a logic level based on the value of the meter output. This boolean value (a green wire on the diagram) can drive the selector input of a case structure. In the case structure you put the code to turn the pump on or off as needed.
Contact me directly at [email protected] and I can give you more details if you need them or have more questions.
Certified Professional Instructor
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Attachments:
demo.vi 13 KB -
How to use both digital and analog input modules in the same worksheet - MCC USB1208LS
Dear all,
Hi, I am Imran. I am using MCC USB1208LS. I have created the worksheet using digital input module as below and able to execute (run).
But when i add another analog input module in the same worksheet and executes, An error Message pops-up as in the below image
I have connected temperature sensor sognal to the analog input of USB1208LS. When using analog input alone in the worksheet, it indiates the actual values.
is any black box solve? please guide me. I am attaching in images
We already placed a purchase order for USB1208FS. Will it sort out my issues?.
Thanking you,
Imran Mohamed.
Attachments:
present worksheet digital input only.JPG 67 KB
with analog input module.JPG 81 KB
error menu.JPG 77 KBHello Imran,
the USB-1208LS is not capable of running concurrent operations such as an analog input scan and ANY digital Ins, Outs, counter reads, or analog outs. In Dasylab, the 1208LS is scanning, and nothing else from that particular device can be requested of it while that is happening.
Yes, using the 1208FS will resolve some of these issues.
Please refer to the ULHELP.CHM file installed on your computer in c:\program files\measurement computing\daq for details on this issue, et al.
also I recommend you send your MCC/DASYLab requests for support to [email protected] as MCC staff (that includes me) does not normally monitor NI's Developer Zone. -
Acquiring Analog Input from Multiple Channels in Labview
Hello,
i am working on a VI where i need to acquire signals from multiple channels in Labview using NI-9129.Initially i want to acquire contineous input signals (voltage and current) and display it on the graph.
Having looked at forum and Labview examples i tried to make an initail VI but i am not sure if the setup i made needs any modification to serve my purpose.I am fairly new to Labview software.
All i want is
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2.Display current and voltage individually on the graph.
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Thank You for having a look at my question.
Attachments:
Voltage-Current VI.vi 81 KBEngr_tech wrote:
i think i already have the tdms for data logging.as far as the tdms data logging is concerned,when i enable the logging mode to "read and log" the data logged inside the excel sheet would be seperate for current and voltage.?
Is it practically possible to acquire data from 4 different channels and plot them.if yes,then am i right to assume that all i need is to modify the current VI for four channels having all of them in parallel.
Yes, you are logging directly to a TDMS file. This is definately the best route for data logging from a DAQ. The currents and voltages will show up as different channels in the same group.
To add more channels, just add them to your DAQmx task. The logging will handle it with no issue. Your calculations will also a little work to add the extra channels. Same for the graphs, since you are using seperate charts.
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How to write a VI to measure the difference between two analog inputs (voltage)
I'd like to measure the difference voltage between two analog inputs.
Could someone write me a VI for it, please?
I'm new with Labview....
Thanks a lot!!!On the numeric palette, there is a function called subtract. As the
help for it says, it 'Computes the difference of the inputs.'.
Since
this is such a simple process, you need to provide some details on why
you can't do this. You can wire just about any data type into the
inputs. Post your code if you need further help.
Message Edited by Dennis Knutson on 04-05-2009 08:23 AM
Attachments:
Subtract.PNG 1 KB -
Analoge input not constant/ NI 6221/ DAQmx
Dear Sir
I use DAQmx (labview7.1).
I would like to use NI6221 to read 32 analoge inputs by using 4 input channels (ai0-ai3).
Each input will read 8 signals by using digital output to select.
I try to look my result by giving constant input voltage to A/D (ai0-ai3).I use input terminal RSE, and NRSE.
My problems are
(1) The reading voltage are changing (some channel is increased and some channel is decreased).
(2) The reading voltage differ from the given value.
How should I solve these problems?
Best regards,
ThongchaiThongchai,
In reviewing your code, I noticed that you are setting up and clearing your DAQmx tasks with every iteration of the loop, this could be causing you some problems in a couple of ways. First, setting up and clearing the tasks takes some time, so you could be introducing delay and getting the wrong measured values as a result of this. Second, when you clear the digital output task in the loop, the lines will return to a default state, which will likely not be the actual values you want -- this could be causing you to measure the wrong channels. The best practice for using DAQmx tasks inside loops is to perform the setup (DAQmx Create Channel, DAQmx Timing, and DAQmx Start) and the DAQmx Clear outside the loop -- the only functions that should be inside the loop are the DAQmx Read and DAQmx Write. Along with this, you will need to make sure you set up the timing for continuous sampling instead of finite. Refer to the LabVIEW example finder and look at the DAQmx examples for continuous acquisition to learn more about this.
Next, you will want to use the Measurement and Automation Explorer (MAX) to configure a task and run a test panel on the channels using a known voltage source to verify that your hardware is working properly. If the values are measuring properly there, then the source of the error may be within the code.
As far as your measurements themselves, it looks like you are trying to do strain measurements of some sort, these typically can be measured more accurately using differential measurements instead of RSE or NRSE. I will include a link to a page about the differences between the measurement types and noise considerations for analog measurements. I will also attach some references to a few documents about strain measurement methods and principles for you review.
Finally, I would recommend looking into an alternative for this system -- either a multifunction DAQ board with more analog input capability (like a PCI-6229, 32 analog inputs), or if you are wanting more accurate strain measurements I would recommend something in our SCXI line for the best strain measurement results.
Field Wiring Considerations for Analog Measurements:
http://zone.ni.com/devzone/conceptd.nsf/webmain/01f147e156a1be15862568650057df15
Strain Measurement References:
http://zone.ni.com/devzone/conceptd.nsf/webmain/04bd243edda22dd386256d75007900d5
http://zone.ni.com/devzone/conceptd.nsf/webmain/C18F65CE920C115086256D720058325B
http://zone.ni.com/devzone/conceptd.nsf/webmain/2d5849b3108e416b86256da2007a8e7b
Regards,
Erik Fogleman
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I am using a 6221 PCI DAQ card and attempting to put out a DC level for a several different times. During the output of each DC level I need to sample two DC inputs via the analog input. Most of my DC levels last for 100s of seconds each and a sample rate of 1S/s on the analog inputs is OK.
My problem arises when I attempt to place a 30ms pulse into the analog output. During this 30ms I need to increase the data rate of the analog input.
I have attempted to use a while loop to control the time between changes but can not get the sampling rates correct to allow for the correct number of samples.
On suggestion has been to take all data at a fast rate. The test will last in excess of 3000 seconds and I get way too much data at a fast rate.
I need to be able to change data rates on the fly as I change the DC levels.
Does any one have any ideas?
Thanks,John@Saft wrote:
I know when the pulse is to arrive before it happens. I have an array of data including voltage outputs, duration of output, and what data rate to sample at.
My problem is insuring the sampling starts before the pulse arrives and continues for the duration of the pulse.
One way I'm sure can work uses "Continuous Acquisition. "See: "Cont Acq&Graph Voltage-Analog SW Trigger.vi" example.
If the DAQ-rate is known before leading-edge of pulse, then, start the Acquisition at whatever frequency's needed, making the input buffer bigger than required, then when the end-of-pulse arrives, reach-into the input buffer and pull-out the "pulse". With a little work you may find an example that uses a "stop-trigger"
There may be a "slick" way to do this without "Continuous Acquisition" using a parameter called "Pre-trigger" scans. My first LV project (circa- 1990) used this, and I've done it with at least one "E"-series board, but not yet under DAQ-MX - and couldn't find an example with Internal clock, External Trigger.
Cheers!
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare) -
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Synchronizing analog input and output
I am in the middle of converting some Traditional NI-DAQ code to the
DAQmx API (I am using C++). Most of it is going quite well: my
code complexity has been greatly reduced and (since upgrading to 7.4)
my CPU usage has plummeted. However, in one particular case I
need my input and output buffers to be synchronized. I.e. sample
0 of my input buffer should be read at the same instant sample 0 of my
output buffer went out on the line. In Traditional NI-DAQ, I
synchronized my input and output start triggers using the following
method (which I believe I found in an example somewhere):
error = Select_Signal(addr, ND_PFI_6, ND_OUT_START_TRIGGER, ND_LOW_TO_HIGH);
error = Select_Signal(addr, ND_IN_START_TRIGGER, ND_PFI_6, ND_LOW_TO_HIGH);
This then allowed me to setup my input thread, then initialize
everything in my output thread and when my output got the start
command, so did my input. The result was that I could perfectly
match buffers of output data to buffers of input data (after taking all
the appropriate buffering into account).
When I try the same method with the DAQmxConnectTerms function, my
buffers don't line up. They are off by 15-20 ms out of a 400ms
buffer (sampling at 10kHz). I tried cutting out the middle man of
PFI6 with similar results. So my current "synchronize" block
looks like this:
error = m_fnConnectTerms("/Dev1/ao/StartTrigger", "/Dev1/ai/StartTrigger", 0);
I get no error. This also seems to cause my output loop to hang
after a few seconds, although that could be a side effect of something
else that I haven't tracked down yet. Is there a better way to do
what I'm trying to do here? Perhaps it is a misunderstanding of
the way buffering works on the M series cards (I am currently using a
6221).Don't use Connect Terminals. Use the technique shown in this example program
C:\Program Files\National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Synchronization\Multi-Function\ContAI-Read Dig Chan
which is the sharing of sample clocks via the DAQmxCfqSampClkTiming function where the sample clock source of one task is set to the clock of the other task. This example slaves a digital input task to an analog input task but the idea is the same for your application. -
How do I use the analog input (ADC) to drive a motion profile in MAX
We are trying to use an anolog input signal from a DAQ card to control the motion contol axis. For now, we want the motor speed to follow a sinusoidal voltage waveform, and later on, we will be using a more complex velocity profile.
In order to accomplish this task, we have searched the user forum, and found information suggesting to operate the servo motor in 'slave' mode under the 'gearing' option. Therefore, we have set the Gear Master to 'ADC Channel-1', Mode set to 'absolute', Gear ratio 1:1, and provided the sinusoidal voltage (+/- 5V, 3 Hz) to the AIN1 connector on the MID-7654 controller. When using the 1-D Interacitve 'single axis' control panel, the motor runs at constant speed in one direction only. It does not react to the sinusoidal speed profile request as we expected.
How do we 'turn on' the 'slave' mode in MAX? Please talk us through the necessary steps and settings? Thanks.
StaffanStaffan,
you can configure and enablethe Gearing mode in MAX and it should be activated after saving the settings and initializing the board. In 1D-Interactive you can't use Gearing. For better flexibility I recommend not using MAX for configuring and enbling Gearing. You better should do this in your application.
In fact there is a perfect LabVIEW-example that ships with the NI-Motion driver (Master Analog Input - Slave Axis Gearing.vi)
I hope this helps,
Jochen Klier
National Instruments
Message Edited by Jochen on 10-02-2007 08:37 AM
Attachments:
gearing.jpg 162 KB -
How to combine Digital Output, a delay and Analog Input in a fast loop
I need to develop a process loop that runs at least at 250 Hz that performs a Digital output, than a delay of 50 microseconds and than an analog input of all the channels. All will be done using ATI MIO 64E3 card. Of course, the acquired data will be processed, displayed and saved. The loop will be running for several minutes until user stops it.
The fastest and most precise timing will occur if you use hardware timing. You can apply hardware timing to analog input on the E Series boards, but not the digital lines. Let's focus on the analog input first. Continuous waveform scanning uses a scan clock, which can be the board's internal one or an external one which you apply. If you want to scan all the channels 50 microseconds after a digital rising edge, then you need an external signal to signify that scan clock.
The E Series boards also have 2 counter/timers onboard that you can use for this purpose. You can set up a retriggerable pulse generation operation, where the counter receives a trigger and then on the user specifications, produces a pulse. You can have that route to the analog input scan clock.
The trigger signal for the counter is that digital pulse. As I mentioned earlier, there is no hardware timing for the digital lines on an E Series board. We do have other digital boards (653x family) that have hardware timed operations if precision is important. If you are satisfied with software's resolution (in the milliseconds), then you can call the E Series board digital function in a loop with a software timer. That digital line can route to the counter to act as the trigger.
So, on the programming side, you can have three separate and independent operations in parallel. One is for the digital function to output on that line every so often. Another is for the counter set at the retriggerable pulse generation. The last is for the analog input. I will describe this in terms of LabVIEW, but it can be done in a similar fashion with the NI-DAQ function calls or Measurement Studio.
The digital examples are in the LabVIEW >> Examples >> Daq >> Digital >> E-Series directory. The Generate Retriggerable Pulse example is in the LabVIEW >> Examples >> Daq >> Counters >> DAQ-STC directory. The E Series boards use the DAQ-STC timing chip.
Go to the LabVIEW >> Examples >> Daq >> anlogin >> strmdisk.llb directory and start with the Cont Acq to Spreadsheet File. This shows how to continuously acquire data and stream it to disk while displaying the data on a chart. Streaming to disk is the efficient way to save data while you are acquiring, as it eliminates the overhead of always opening and closing the file through the iterations of the loop. This saves to a file that can be opened by other applications (Excel, Word, etc.), but it is not as fast as writing to a binary file, which must be opened and read back through LabVIEW. However, for your ~250 Hz rate, it should be fine. Then, go to the LabVIEW >> Examples >> Daq >> anlogin >> anlogin.llb and look at the Acquire N Scans -ExtScanClk example. This shows how to apply the scan clock. Here, the AI Start that you saw in the previous example is replaced by 4 VIs (3 AI Clock Config's and the AI Control). Make those changes to the first example and then add a constant 0 to the AI Control parameter for total scans to acquire. That specifies the continuous operation. The File >> VI Properties >> Documentation menu item of the example describes the physical connections.
If you aren't using LabVIEW, use the NI-DAQ User Manual and the NI-DAQ Help file installed on your machine. You can look at your AT E Series User Manual at the http://www.ni.com/manuals pages for more information on the hardware. Also, if you want to route those signals internally on the board, you can find some entries in the KnowledgeBase at the http://www.ni.com/support pages.
Regards,
Geneva L.
Applications Engineering
National Instruments
http://www.ni.com/ask -
How to trigger from analog input channel
I am using a BNC-2110 into a 6062E card. And I am sure this question has been posted several times but I was unable to find a clear answer. I am trying to use the devices ai0 channel as my trigger source. I tried using a voltage source in the trigger reference, and that almost works but it only works for several loops before coming up with an error. If someone knows what I may be possiblely doing wrong or where to find this information, any assistance would be great.
- there is always an easy way, but it is always the hardest to findHey Henry,
The BNC-2110 is just the connector block. What card do you have the is interfacing this block with your computer? (should be a PCI or PCI-express card). Are the GPS receivers outputting digital signals that conform to TTL compatible logic levels (are the signals 5V or 0V with no more than 1.6mA of current)? If they are outputting a digital signal, then you can send these signals into any of the PFI lines to act as a trigger (or to the trigger lines).
For example, if you would like to perform an analog acquisition each time the trigger hits and have an X series card, you can open up example finder (help»find examples...) and then open Hardware Input and Output»DAQmx»Analog Measurements»Voltage»Cont Acq&Graph Voltage-Int Clk-Retriggerable.vi. Then make sure your Trigger Source parameter is set to the same PFI line that you are sending your GPS signal to (on the BNC-2110, the trigger connections are really just PFI0 and PFI12, but these are common lines to use for triggers, but any PFI line will work). If you have an M series card, and cannot do retriggerable analog input, you can reference this example for how to use counters to workaround this limitation of our M series cards: https://decibel.ni.com/content/docs/DOC-6801
If your GPS signal isn't digital, and is some arbitrary analog square wave, you can use an example like this: https://decibel.ni.com/content/docs/DOC-4657 to use the analog value to trigger you're reading (you just need to set the appropriate window for your analog signal in the VI). I hope this helps!
-Nathan H
Software Developer
National Instruments
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