NI-MyRIO Analog Inputs

Greetings,
I'm just getting the myRIO up and running, and I'm sort of disappointed that the +/- analog inputs are differential only. Is there any low level way to use these channels differently, or at least each as single-ended? Pseudo-differential, perhaps? I'm going to have to resort to using the line-level audio inputs to measure single ended inputs and make sure the input level is lower than whatever the max voltage is for that (1.7 volts or something).
Any users out there care to comment?
I know the other inputs are single ended, but only 0-5V. Bummer.
Thanks in advance.
TR
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Tommy R.
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I grounded the 0- and 1- inputs of the two differential channels and had no problem measuring single ended voltages going into 0+ and 1+. I was just expecting to be able to configure the four inputs to be four single-ended inputs like I normally can do on all other NI DAQ analog hardware. The project I'm working on needs four measurments (all +/- voltages), so I was hoping the two +/- 10 channels were reconfigurable to four, like I'm used to. I'm just going to have to be creative and use the audio inputs as well.
><><><><><><
Tommy R.
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MyRIO analog input express Vi (n samples) missing file

Dear Users,
I am trying to read analog data with an express VI in myRIO. This works with Analog input (1 sample), but fails with Analog input (n samples) due a missing file "myRIO v1.1 FPGA Throughput.lvbitx".
I googled it and searched it on ni.com, but nobody seems to have the same isssue (I suppose because of the myRIO is quite new right now)
Thank you!
Solved!
Go to Solution.

I would try doing a repair of your installation. It looks like something didn't get installed properly.
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MyRio analog input

Greetings,
I am new to NI and I have a question about the setting the timing on the analog inputs. I want to set up a clock (DIO output) and in addition, have ever clock rising edge initiate a single A/D conversion. Is this possible with the MyRio?
The background is I have a device with a string of sensors that will output a analog value every time I send in a clock, therefore I need to digitize the analog signal synchronized with the clock.
In addition, if someone has found documentation other than the manual, I would appreciate your sharing.
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Hi Frank,
Welcome to the forums! What you want to do is definitely possible with the myRIO. You have a few options available to you:
If you have the ability to upgrade to LabVIEW 2014, the myRIO 2014 toolkit includes new Interrupt Express VIs. You specify a condition (in your case, a rising digital edge) and a callback VI that executes when this condition is met. The best way to learn about how this works is to take a look at the examples in Example Finder (Help»Find Examples»Toolkits and Modules»myRIO»Interrupt Handling.lvproj.
If you don't have the ability to upgrade to LabVIEW 2014, you could implement something similar yourself by having a loop wait for a rising edge on a digital line by using the Digital Input Express VI and then doing the analog measurement. This method would introduce some jitter because of the overhead associated with the Express VIs. An example snippet of this is below. If you do have access to the FPGA module, I would recommend implementing this logic on the FPGA instead (further below).
Using the FPGA module to do the triggering would give you better results because of the tighter timing capabilites of the FPGA as compared to the Express VIs. The logic would be mostly the same on the FPGA as it is on the real-time except for the appropriate VIs swapped around:
Here, we are waiting for a rising edge on a digital line and then placing the data from the analog channel in a to provide this data to the host (real-time) application.
If you want absolute control over the synchronization of the AI to the clock, I would recommend implementing the logic in FPGA (2013 or 2014). If your application has a little leeway in terms of timing, the Express VIs (2013) or Interrupt Express VIs (2014) would work for you.
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Best Regards,
Matthew B.
Applications Engineer
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Labview myRIO Analog data sampling rate

I have been using the myRIO to acquire audio input from a microphone.
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Hi ykhali,
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Analog inputs no longer working on Audigy 2 ZS Platinum Pro's external dr

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I had made no major changes to my computer - software or hardware - when the problems began. I recently added a new SATA hard dri've, but the Audigy dri've did work after that.
I've taken steps suggested in another thread on this forum and uninstalled all Creative software and drivers, used the latest driver package's uninstall program as well as Driver Cleaner, and finally manually deleted everything related to Creative and Audigy from the system registry (and rebooted quite a few times in between). I then installed the original drivers from the CD that came with the sound card (a setup that has worked before), but still the problem persists.
Any ideas on where to even begin looking for a solution? I find it hard to believe that it's a hardware problem, since three inputs suddenly went silent at the same time, and no other connections were affected. Yet I've done as clean a reinstall as possible, and that hasn't solved the problem.
My current computer configuration:
OS: Windows XP Pro (SP2 and all latest updates)
CPU: Athlon XP 500+
RAM: 2x 52 MB
Motherboard: Abit AN7 (integrated sound chip disabled)
Video card: Sapphire Radeon 9800 Pro
Network card: D-Link DFE-530TX
Hard dri've : Seagate ST320026A, 20 GB IDE
Hard dri've 2: Maxtor 6L080J4, 80 GB IDE
Hard dri've 3: Seagate ST330083, 300 GB SATA-II

I don't have a Platinum Pro or the dri've, but a general hardware troubleshooting step I would take would be to remove the soundcard and either move it to another slot or re-seat it. Also, I'd disconnnect and reconnect all cables to and from the card and the dri've. If I had another machine I could try the card or dri've in, I'd do that. If I could borrow another dri've or even another card, I'd test those too. (Swapping parts is often the simplest diagnostic.) Yeah, maybe it's not a hardware problem, but I'd take these steps just to rule out some possibilities.
Edit: And if you can remove or disconnect the SATA dri've and restore the system to the condition before you installed it, that's another good test.Message Edited by Katman on 2-8-2005 2:56 AM

Usb 6009 multiple analog inputs

I am currently attempting to sample two different analog inputs at different sampling rates using a USB 6009. I keep getting the 'resource reserved' error and am wondering if this is not possible using this DAQ. Questions:
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I have attached my vi. Thank you in advance for your help.
I surf therefore I am....
Attachments:
demo_nolvl.vi ‏27 KB

The DAQ boards only have 1 timing clock for the analog inputs/outputs. So you can only have 1 sample rate on a given card. I would recommend just sampling at the highest of the desired rates in a single task.
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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.
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Staffan,
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.
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I hope this helps,
Jochen Klier
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Message Edited by Jochen on 10-02-2007 08:37 AM
Attachments:
gearing.jpg ‏162 KB

I am getting a -50101 error when trying to get analog input from a compact rio

I am just doing the initial setup of my compactRIO system and have been able to successfully add the cRio in Max and then into a new project. I created a very simple VI with analog input that I am trying to read into an indicator, following one of teh tutorials. The module I am reading the input from is a cRio-9201. The input is voltage. I have already added the module to teh project under the FPGA, which is under the RIO in the project tree. Any ideas what I may be missing would be greatly appreciated!
Thanks

The 9201 C Series module needs to be created under the FPGA Target
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How do I acquire multiple signals in the NI cDAQ 9172 using 2 analog input modules?

Hi everyone,
Is anyone familiar with using the NI cDAQ 9172? This is my first time using it and I am not sure what exactly I am doing wrong... Alone with a NI 9233 analog input module, it works great. I can grab my 4 signals from each channel and go. However, when I add another analog input module to the mix, it gets an error. It looks like it is reading only one and not the other. It bombs at one of the DAQ start task and read task.
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Any help is much appreciated. Thanks!!

Hi Jud,
Both threads are correct. The cDAQ-9172 has a single analog input timing engine, so both of your analog input modules will need to be in a single task. The other VI you referenced shows one analog input task (with channels added from two modules) as well as an analog output task. Analog output has a separate timing engine from analog input, so both of those can run in parallel independent tasks.
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Synchronizing two counter frequency inputs with multiple analog inputs

Hello all,
I'm fairly new to LabVIEW and I'm trying to collect data from multiple sources with synchronized timing on the acquisition but I'm having trouble figuring it out. My problem is that I've got two counter frequency inputs, one optical tachometer reading one pulse per revolution, and a max machinery flow meter with a k factor of 12000. I can't seem to figure out how to sync the timing with my multiple analog inputs. I've been attempting to get the tachometer to sync with the analog inputs first by following the example linked here. (https://decibel.ni.com/content/docs/DOC-10785) So far each time I run it I either get a timeout error on the DAQmx read or a "Multiple sample clock pulses were detected" error (see attached image). It seems if I slow the sampling rate way down to say 10 hz and ensure that the tachometer signal is over 800-1000 RPM (13-17 Hz) before starting the VI then the program will run without errors until the RPM drops below that threshold then the "Multiple sample clock pulses" error occurs. The code is attached below.
Does anyone know of a more effective way of syncing counter frequency inputs with analog inputs? I'd like to have a VI that can show 0 RPM (and eventually 0 flow as well, but I think I need to figure out the timing of one counter before I add another as it seems I can't have two counters in the same task). Any help on this would be greatly appreciated.
LabVIEW version 13.0
cDAQ-9178 Chassis with NI 9401 for the two counter inputs and NI 9205 for the analog inputs.
Thanks!
Richard
Solved!
Go to Solution.
Attachments:
SimpleDAQ.vi ‏44 KB
LV_Error.JPG ‏31 KB

Maybe third times the charm?
So I've finally got a good handle on why the VI is having problems at low RPM though I'm somewhat embarassed how long it took me to do that
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Attachments:
SimpleDAQ_1_Start Stop.vi ‏48 KB

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Hi all,
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How to get signal from analog input and send it to analog output (real-time)

Hi everyone,
I am doing simple task in Visual C++ and I am using PCI-6221(37 pin).
Basically, I want to send same signal from 'analog input' to 'analog output'
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Can someone please provide me sample program.
I would appreciate if you could provide me with the good tutorial which explains
step by step everything about programing NI-DAQmx for C/C++.
Best Regards,
Khassan
Solved!
Go to Solution.

This is my code in C++, you can optimize it if it looks too messy. This code reads signal from analog input and outputs it through analog output.
To make this code work additional include directories and library directories must be added from NI.
I hope it helps someone.
#include <stdio.h>
#include <conio.h>
#include "NIDAQmx.h"
#include <math.h>
#define DAQmxErrChk(functionCall) { if( DAQmxFailed(error=(functionCall)) ) { goto Error; } }
int main(int argc, char *argv[])
int32 error=0;
TaskHandle taskHandleRead=0,taskHandleWrite=0;
int32 read=0;
float64 dataRead[1000];
char errBuffRead[2048]={'\0'};
char errBuffWrite[2048]={'\0'};
bool32 done=0;
int32 written;
DAQmxErrChk (DAQmxCreateTask("",&taskHandleRead));
DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandleRead,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleRead,"",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,0));
DAQmxErrChk (DAQmxCreateTask("",&taskHandleWrite));
DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandleWrite,"Dev1/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL));
DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleWrite,"ai/SampleClock",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));
DAQmxErrChk (DAQmxStartTask(taskHandleRead));
DAQmxErrChk (DAQmxStartTask(taskHandleWrite));
while( !done && !_kbhit() )
DAQmxErrChk (DAQmxReadAnalogF64(taskHandleRead,1,10,DAQmx_Val_GroupByScanNumber,dataRead,1000,&read,NULL));
DAQmxErrChk (DAQmxWriteAnalogF64(taskHandleWrite,read,0,10.0,DAQmx_Val_GroupByChannel,dataRead,&written,NULL));
_getch();
Error:
if( DAQmxFailed(error) )
DAQmxGetExtendedErrorInfo(errBuffRead,2048);
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DAQmxClearTask(taskHandleWrite);
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printf("DAQmx Error: %s\n",errBuffRead);
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Analog Input and Output in One Single VI

I need help in setting both analog input and output in one single VI. How do I assign channels to be either input or output? How do I simultaneously uses both in one single VI with a while loop structure?? Which AO am I suppose to use to obtain signal from the function generator I have built to feed into the DAQCard-1200?? Help!!
Attachments:
Test1.vi ‏48 KB

One thing you'll need to be aware of is that you will need to DMA lines: one for AI and one for AO. If you don't, then you can configure the DAQCard to do without DMA using the Config VI. But you certainly can do this.
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Hi all,
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Looking at similar posts I am pretty sure that I can't use an external trigger or a shared clock, I also tried to use the synchronization of timed structures but no cigar.
I am including a quick vi that I whipped out showing how the signal jitters due to the lack of synchronization. The AO from the 9263 connects to the AI in the 6008 in this example.
Solved!
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Attachments:
Test Pulse.vi ‏117 KB

I talked to a specialist in the phone and tols me that it is not possible.

NI-MyRIO Analog Inputs

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