How to use DAQ to control Mindstorms NXT in real time?
I have a project in which I must use a a biosignal to control a Lego robot in real time. My group is using a DAQ to read an EMG signal into the computer. We are trying to use the RMS of this signal to control the power of the Servo motors that drive the robot. However, the DAQ assistant can not be loaded into the NXT (the error message says something about password protection).
Is there any way to read the RMS from another vi and feed it into the vi that is loaded into the NXT?
In general terms, what I would like to do is use the root mean square of a biosignal read by a DAQ to control the power of the Servo motors, in real time.
Any help would be greatly appreciated.
Attachments:
Master File.vi 65 KB
You won't be able to run DAQmx VIs on the NXT. The error message is misleading -- the problem is that the DAQ VIs weren't written to run in the NXT's virtual machine.
Instead, you should create two separate VIs. The first VI will run completely on the PC, will acquire the EMG signal, and then pass messages to the NXT over Bluetooth indicating how much power the motors should get.
The second VI will run completely on the NXT, will read messages from one of the Bluetooth mailboxes, and then feed that power value into a motor control VI.
If Bluetooth is not an option for you, you could use just one VI running on the PC, and use the NXT direct command VIs to set motor power over USB. (The drawback is that your NXT is now tethered to the computer.)
James Blair
NI R&D
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<html>
<head><title>IPIB Database Selection</title></head>
<body bgcolor="#DFDFFF">
<H1><CENTER>IPIB Database Selection</CENTER></H1>
<font size=4>
<%@ page language="java" %>
<%@ page import="java.net.*,java.io.*,java.util.*" %>
<%
String symbol = request.getParameter("symbol");
if (symbol != null) {
String urlString = "http://finance.yahoo.com/download/javasoft.beans?SYMBOLS=" + symbol + "&format=ab";
try {
URL url = new URL(urlString);
URLConnection con = url.openConnection();
InputStream is = con.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = br.readLine();
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String name = tokenizer.nextToken();
name = name.substring(1, name.length()-2);
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price = price.substring(1, price.length()-2);
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[Forum FAQ] How to use parameter to control the Expand/Collapse drill-down options in SSRS report?
In SQL Server Reporting Services (SSRS), drill-down is an action we can apply to any report item to hide and show other report items. They all are ways that we can organize and display data to help our users understand our report better. In this article,
we are talking about how to use parameter to control the Expand/Collapse drill-down options in SSRS report.
Consider that the report has a dataset (dsSales) with following fields: SalesTerritoryGroup, SalesTerritoryCountry, CalendarYear, SalesAmount.
1. The report has the following group settings:
Parent Group: SalesTerritoryGroup
Child Group: SalesTerritoryCountry
Child Group: CalendarYear
Details: SalesAmount
2. Add three parameters in the report:
GroupExpand:
Available Values: “Specify values”
Label: Yes Value: Yes
Label: No Value: No
Default Values: “Specify values”
Value: Yes
CountryExpand:
Available Values: “Specify values”
Label: Yes Value: =IIF(Parameters!GroupExpand.Value="No",Nothing,"Yes")
Label: No Value: No
Default Values: “Specify values”
Value: =IIF(Parameters!GroupExpand.Value="No","No","Yes")
YearExpand:
Available Values: “Specify values”
Label: Yes
Value: =IIF(Parameters!GroupExpand.Value="No" or Parameters!CountryExpand.Value="No",Nothing,"Yes")
Label: No Value: No
Default Values: “Specify values”
Value: =IIF(Parameters!GroupExpand.Value="No" or Parameters!CountryExpand.Value="No","No","Yes")
3. Right click SalesTerritoryCountry icon in the Row Groups dialog box, select Group Properties.
4. Click Visibility in the left pane. Select “Show or hide based on an expression” and type with following expression:
=IIF(Parameters!GroupExpand.Value="Yes", False, True)
Select “Display can be toggled by this report item” option, and select “SalesTerritoryGroup” in the drop down list.
5. Use the same method setting CalendarYear, (Details) drill-down with following expression:
=IIF(Parameters!CountryExpand.Value="Yes", False, True)
=IIF(Parameters!YearExpand.Value="Yes", False, True)
6. Click SalesTerritoryGroup text box in the tablix. Select InitialToggleState property in the Properties dialog box, and type following expression:
=IIF(Parameters!GroupExpand.Value="Yes", True, False)
7. Use the same method setting SalesTerritoryCountry, CalendarYear text box with following expression:
=IIF(Parameters!CountryExpand.Value="Yes", True, False)
=IIF(Parameters!YearExpand.Value="Yes", True, False)
After that, when we preview the report, we can use these three parameters to expand/collapse drill-down.
Note:
In our test, we may meet following issue. We can check the expression of InitialToggleState property to troubleshooting the issue.
Applies to
Reporting Services 2008
Reporting Services 2008 R2
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we are talking about how to use parameter to control the Expand/Collapse drill-down options in SSRS report.
Consider that the report has a dataset (dsSales) with following fields: SalesTerritoryGroup, SalesTerritoryCountry, CalendarYear, SalesAmount.
1. The report has the following group settings:
Parent Group: SalesTerritoryGroup
Child Group: SalesTerritoryCountry
Child Group: CalendarYear
Details: SalesAmount
2. Add three parameters in the report:
GroupExpand:
Available Values: “Specify values”
Label: Yes Value: Yes
Label: No Value: No
Default Values: “Specify values”
Value: Yes
CountryExpand:
Available Values: “Specify values”
Label: Yes Value: =IIF(Parameters!GroupExpand.Value="No",Nothing,"Yes")
Label: No Value: No
Default Values: “Specify values”
Value: =IIF(Parameters!GroupExpand.Value="No","No","Yes")
YearExpand:
Available Values: “Specify values”
Label: Yes
Value: =IIF(Parameters!GroupExpand.Value="No" or Parameters!CountryExpand.Value="No",Nothing,"Yes")
Label: No Value: No
Default Values: “Specify values”
Value: =IIF(Parameters!GroupExpand.Value="No" or Parameters!CountryExpand.Value="No","No","Yes")
3. Right click SalesTerritoryCountry icon in the Row Groups dialog box, select Group Properties.
4. Click Visibility in the left pane. Select “Show or hide based on an expression” and type with following expression:
=IIF(Parameters!GroupExpand.Value="Yes", False, True)
Select “Display can be toggled by this report item” option, and select “SalesTerritoryGroup” in the drop down list.
5. Use the same method setting CalendarYear, (Details) drill-down with following expression:
=IIF(Parameters!CountryExpand.Value="Yes", False, True)
=IIF(Parameters!YearExpand.Value="Yes", False, True)
6. Click SalesTerritoryGroup text box in the tablix. Select InitialToggleState property in the Properties dialog box, and type following expression:
=IIF(Parameters!GroupExpand.Value="Yes", True, False)
7. Use the same method setting SalesTerritoryCountry, CalendarYear text box with following expression:
=IIF(Parameters!CountryExpand.Value="Yes", True, False)
=IIF(Parameters!YearExpand.Value="Yes", True, False)
After that, when we preview the report, we can use these three parameters to expand/collapse drill-down.
Note:
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Applies to
Reporting Services 2008
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I need to program a Hittite Fractional-N Synthesizer Evaluation Kit with a HMC702LP6CE an external YIG oscillator. Not sure how to use Labview to control the PLL.
Here is how to use the PLL. But I don't know of how to interact with that device
http://zone.ni.com/devzone/cda/tut/p/id/3781
And for thouse who don't know what a PLL is a free bonus link is here:
http://digital.ni.com/public.nsf/allkb/07BC8D77D4E9AE258625708B007CE74F?OpenDocument
and a second one on what that device is: http://www.hittite.com/products/view.html/view/HMC702LP6CE
Now we are all caught up to speed.
Sam S
Applications Engineer
National Instruments -
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# Interfacing to LabView via TCOM
package require tcom
# Start the "Frequency Response" VI as an ActiveX server. (If the VI
#was
# compiled then you would refer to it by its registered server name.
#For
# example, if you compiled 'A.vi' and created 'A.exe', then you would
#load
# it with 'set lv [::tcom::ref createobject "A.Application"]'.)
set lv [::tcom::ref createobject "LabView.Application"]
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set vi [$lv GetVIReference $viPath]
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#continuously
# once you start them, and many are set to start running as soon as
#you
# load them. Obviously, compiled VIs typically start running as soon
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# 10
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set WShell [::tcom::ref createobject WScript.Shell]
$WShell SendKeys %%
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$WShell SendKeys %X
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$lv QuitHi,
I'm not too familiar with tcom interfacing with LabVIEW, but you may want to check out other DFs, such as this one here. Would it be possible to printscreen the LabVIEW error you are talking about- "high freq not found...". Furthermore, you may want to confirm the functionality of the script with the person who made it.
I hope this helps,
Regards,
Nadim
Applications Engineering
National Instruments -
How to use the custom control ?
Hi Friends,
plz help to use of custom control in screen painter ?
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Thanking you.
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with regards,
sowjanyagosala -
How to update the HTML file so that we can Control our process in real time
After installing following three steps as per the lookout 4 online help I am unable to Monitor and control the Process in HTML format, which was exported manually in lookout server.
1) Creating a Web Client Page in Lookout
2) Download a Lookout Web Client
3) Setting Up Own Web Server
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It seems like your process is not updating. When you create a Web Client, it uses ActiveX which lets you control the Lookout process fully. Make sure that you run the process. You can do this by pressing CTRL+Spacebar which puts it in Run-mode. Perhaps then you may see your graphs, etc updating.
Also, please refer to page 11-1 of the Users Manual linked below:
http://www.ni.com/pdf/manuals/322390a.pdf
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Anu Saha
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National Instruments -
Hi am trying to save Data into a write to measurement file vi using a NI PXI 1042Q and DAQ NI PXI-6229 with a real time mode but it is not working but when i run it without uploading it into the PXI it save in to the file please find attached my vi
Attachments:
PWMs.vi 130 KBother problem is that the channel DAQmx only works at real time mode not on stand alone vi using Labview 8.2 and Real time 8.2
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1. How to Login to Web Dynpro developer studio in real time scenario.
Do we have login pad and User id to enter developer studio.
Is the user id for login maintained in UME of J2EE engine.
2. How to stop and start j2ee engine in real time. Is it same SAP Management console is used like in Demo version.
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Cheers,
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How to Logon to Web Dynpro developer studio in real time scenario.
Hi,
1. How to Login to Web Dynpro developer studio in real time scenario.
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Is the user id for login maintained in UME of J2EE engine.
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Hi, All!
I would like to collect knowledge about "best practice" examples for using Source Code Control and project organization for relative large application (let's say approx 1000 SubVIs).
Tools used:
LabVIEW 8.0
CVS Server
PushOK CVS Proxy Client
WinCVS
With LabVIEW 8 we can organize large project pretty well. This described in article Managing Large Applications with the LabVIEW Project.
I have read this article too: Using Source Control Software with LabVIEW In this Article Source Safe used, but with PushOK all looks nearby the same and works (some tricks for compare function are required).
Example. Two developers working together on same project. Internally project is modular, so one developer will work with module "Analysis", and another one with "Configuration" without interferences. These modules placed into Subfolders as shown in example above.
Scenario 1:
Developer A started with modification of module "Analysis". Some files checked out. He would like to add some SubVIs here. So, he must also perform check out for the project file (*.lvproj), otherwise he cannot add anything into project structure.
Developer B at the same time would like to add some new functions into module "Configuration". He also needed to check out project file, but this file already checked out by Developer A (and locked). So, he must wait until lvproj file will be checked in. Another way is mark *.lvproj files as text files in PushOK, but then one of developers will get conflict message by checking in and then merging will be necessary. This situation will coming very often, because in most cases *.lvproj file will be checked out all the time.
Question: Which practice is better for such situation? Is Libraries better than folder for large project?
Scenario 2:
Developer C joined to the team. First, he must get complete project code for starting (or may be at least code of one Library, which assigned to him).
Question: How it can be done within LabVIEW IDE? Or WinCVS (or other SCC UI) should be used for initial checkout?
Scenario 3:
Developer D is responcible for Build. Developers A,B,C have added lot of files into modules "Analysis", Configuration" and "FileIO". For building he need to get complete code. If our project splitted into folders, he should get latest *.lvproj first, then newly added SubVIs will appear in Project Explorer, then he should expand tree, select all SubVIs and get latest versions for all. If Project organized in Libraries, he must do the same for each library, isn't?.
Question: Is this "normal way", or WinCVS should be used for this way? In WinCVS its possible with two mouseclicks, but I prefer to get all code from CVS within LabVIEW IDE recursively...
That was a long post... So, if you already working with LabVIEW 8 with SCC used for large project, please post your knowledge here about project structure (Folders or Libraries) and best practices, its may be helpful and useful for all of us. Any examples/use cases/links etc are appreciated.
Thank you,
AndreyRegarding your scenarios:
1. Using your example, let's say both developers checked out version 3
of the project file. Assuming that there are only files under the
directories in the example project, when Developer A checks in his
version of the project, there will be new files in one section of the
project separate from where Developer B is working. Developer B,
notices that there is now a version 4 of the project. He needs to
resolve the changes so will need to merge his changes to the latest
version of project file. Since the project file is a text file, that is
easy to do. Where an issue arrises is that after Developer B checks in
his merged changes, there is a revision 5. When Developer A and B go to
make another change, they get the latest version which will have the
merged changes to the project file but not the referenced files from
both Developer A and B. So when A opens version 5, he sees that he is
missing the files that B checked in and visa versa. Here is where the
developers will needs to manually use the source control client and,
external to LabVIEW, get those new files.
Where libraries help with the above scenario is that the library is a
separate file from the project so changes made to it outside of the
project do not require the project to be modified. So this time, the
developers are using a single project again which time time references
two libraries. The developers check out the libraries, make changes to
the libraries, and then check those changes in. So when each developer
opens the project file, since it references the project file, the
changes to the library will be reflected. There is still the issue of
the new files not automatically coming down when the latest version of
the library is obtained. Again, the developers will needs to manually
use the source control client and, external to LabVIEW, get those new
files. In general, you should take advantage of the the modularity that
libraries provide.
2. As noted in the above scenario, there is no intrinsic mechanism to
get all files referenced by a LabVIEW project. Files that are missing
will be noted. The developer will then have to use the source control
provider's IDE to get the initial contents of the project (or library).
3. See above scenarios.
George M
National Instruments -
How to use VISA to control a RS-485 interface.
Hi All,
I am devloping an app that needs to talk to a custom made device using full-duplex rs-485. There are two types of operations I have to accomplish.
1) Down load micro-code and stuff like that when ever a user pushes a button.
2) Deterministically transmit a small command packet that sets some control parameters.
I will never have to do both operations at the same time.
I would like to do task 1) in a windows environment.
I have to do task 2) using LV-Real Time.
The windows machine will be in full control of the RT system, so I will be able to dictate that the two operations never happen at the same time.
So...
A) Is this hardware config "legal"?
B) Is ther any thing special I have to do
(like got into tri-state mode)?
C) Does any one have examples or hints that would help me get through this project with a minimum of blood loss?
Thanks for reading this,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under constructionBen,
See these documents:
KnowledgeBase 17M6L0TI: What Are the Different Transceiver Modes on the NI RS-485 Serial Cards?
KnowledgeBase 2EMAARXY: How Can I Configure My Serial Board for 2- or 4-Wire Mode in LabVIEW RT?
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Chad H.
Applications Engineering
National Instruments
http://www.ni.com/ask -
Hi all,
I'm trying to creat a word and excel documents using Save Report to File VI. When wiring a password to this last VI, the document created are only protected against writing but not reading. How can I use active X controls to password protect these documents against reading?
Thanks a bunch!
OThere is no predefined functionality available in LabVIEW. So you have to implement this on your own.
It seems to me that you own the Office Report Generation Toolkit. You can use the Excel Get ActiveX References.vi from the Excel Specific >> Advanced palette to get access to the "generic" ActiveX Excel references. Starting from this point, you can use property and invoke nodes to get to the setting you are going to modify.
Please refer to this link for information on Excel password protection. I have not searched for the object giving you access to those settings though....
hope this helps,
Norbert
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