How to use labview to control a robotic arm by EMG signal
Hello,
I am working on simulation of an active Exoskeleton (wearable robot) for the upper limb using LabVIEW for my senior project. I need to use the EMG signal as an input to move the elbow joint (flexing and extending). I downloaded labview biomedical toolkit to take a ready simulated EMG signal but have a weak experience in LabVIEW.
The design criterial I am planning to use is to establish a threshold for the EMG signal using a comparator (above 0 for example) and set a counter for everytime the signal passes the threshold as(+1) in every count. Then, specify a degree value for the counter (for example when the counter reaches 10000) and feed this value of the counter to a simple simulated structure for the joint (simple angle of 2 lines) or a meter to represent the movement.. e.g. every 10000 count = 1 degree of movement. Zero crossing can also be used instead of the comparator and the signal will be filtered and that is easy to do. However, my problem is in converting this logic into LabVIEW. I don’t know how to set a counter for the signal and make every number of counts refer to a specific degree of movement and I also don’t know how to form the simulated joint structure in LabVIEW or even how to transfer this into a simple meter device in LabVIEW.
I have only one month to do this project so any help or ideas you provide are highly appreciated
Thank you ,
CarlFHellwig
Thank you for providing this example I just implement it in the software to check the counter results.
In fact, the design criteria I desided to use latly is to use is to establish a threshold for the EMG signal using a comparator and correlate the EMG signal with the angles of movement of a simple simulated structure "motor" for a single joint (simple angle of 2 lines) eg. 30,60,90,120,150 degrees for flexing and extending. Zero crossing can also be used instead of the comparator and the signal will be filtered and that is easy to do.
In other words, the idea is to drive a motor for different angles based on the input EMG signals. I am now stuck with developing the algorithm of how the angles are related to the RMS value of the signal while flexing and extending and how to convert this RMS into angular velocity and angular position to form the simulation.
I will be grateful if someone guided me to a person did a similar project to discuss some issues.
Similar Messages
-
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 -
How to use LabView to control Primera Bravo II CD burner?
I am trying to use LabView to control the Primera Bravo II CD burner and label printer. The software that controls the Bravo II is PTPublisher. How to use LabView to communicate/control the PTPublisher? Please help, Thanks
Hi Qian,
I installed PTPublisher on a virtual machine, and I was wondering what kind of tasks you wanted to control within LabVIEW. From the program GUI, it appears like the only way to access functions is via mouse clicks. Do you know of any other way to control the Bravo II CD burner besides the PTPublisher software? If not, does the PTPublisher allow you to control it in some way other than clicking?
Peter K.
National Instruments -
How to use labview to control the horizonal menu of TDS420A?
Hellow!
anyone can tell me how to control the horizonal menu of TDS 420A osilloscope? currently,i use "TKTDS 420A config.Horiz.VI and TKTDS readwaveform.VI to control the horizonal menu,i would like to control the delay time to get a specific part of the whole waveform,but it doesn't work,attached is a example,anyone can tell me the reason? thanks!
Attachments:
example.vi 54 KBYour vi won't load on our machines without the TDS' driver. If you "Save with options" as a "Development Distribution" it should include the required sub-vi's. The be sure and "zip" the resulting .llb file to reduce its size.
P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion -
how to use labview with gpib to connect with Agilent PNA E8362B ?i am newbie ..just started to work on labview about a fortnite bck and +i am a novice in interfacing(networking... jst know tidbits) skill ..so plzzzzz explain me in a litle detail
Sir
We were able to solve that problem...but now could you advice as to which DC power supply we should use (preferably avalable in India) so that it can be controlled by Labview (through a gpib/rs232/any other port) to give a square wave of desired frequency/other parameters.
Regards
Shivam -
how we use tcom to control vi program? we have got this tcl script from googling but it is not running , it says to run the vi as activex server ,how can we do it? it is opening the vi but gives the error "high frequency not found in vi connector pane.what are the different methods that we can use with vi ? in the example some methods such as getvireference etc have been used
# 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"]
# Create a reference to the VI. (You may want to use
# '[$lv ApplicationDirectory]' to get the correct path for this PC.
# For a compiled VI, use just the VI's name, for example:
# 'set viPath "A.vi"'.)
set viPath "C:\\Program Files\\National Instruments\\LabVIEW 8.2\\examples\\apps\\freqresp.llb\\Frequency Response.vi"
set vi [$lv GetVIReference $viPath]
$vi FPWinOpen True
# Create the parameter arrays. The first array is a list of terminal
#names;
# the second array is a list of their values. We must pass in a value
#for
# every terminal on the VI's connector (unless we are very sure that
#the VI
# has a valid initial value for that terminal). We must also pass in
#a
# value for the output terminals; LabView will ignore it.
set names [list Amplitude "Number of Steps" "Low Frequency" "High
Frequency" "Response Graph"]
# Create the values array
set values [list 5 105 15 1005 0]
# Call the VI and get the results
$vi Call names values
# The Response Graph is returned in 'values'
puts $values
#5 105 15 1005 {{400.0 406.238291234 412.573873162...
# If the VI is running we cannot use the 'Call' method, but we can
# set and query individual Controls/Indicators. (The "Frequency
# Response" VI does not continue running - you call it, it runs, then
# it stops until you call it again. However, many VIs run
#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
# as you load them.)
$vi SetControlValue "Low Frequency" 5
$vi SetControlValue "Amplitude" 10
$vi GetControlValue "Amplitude"
# 10
# The graph hasn't changed (because the VI isn't running), but we can
# still read it. Notice that the graph is an Indicator (not a
#Control),
# but we still use the 'GetControlValue' method to read it.
set new_graph [$vi GetControlValue "Response Graph"]
# You may need to manipulate the VI's menus. Unfortunately LabView
#does
# not expose any method for doing this, so you must use the Windows
# Scripting Shell. The <ESC> key does not seem to work this way, so
# the menus should have shortcuts that use ALT or Ctrl key
#combinations.
# Start the Windows Scripting Shell and send an <ALT> key to the GUI
set WShell [::tcom::ref createobject WScript.Shell]
$WShell SendKeys %%
$WShell SendKeys {DOWN}
# Send Alt-X
$WShell SendKeys %X
# When we are done, we may want to shut down the VI.
$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 -
Using LabView to control a pump
I am a college student working on my senior project. My group is trying to use LabView to control two diaphragm pumps. We have a code written that generates the appropriate signal. The problem that we are having is getting this code to activate the pumps and make them run.
Any help would be appreciated.You really need to provide more information.
What is the interface between the code and the pumps? How does the code communicate with the interface? Are all the necessary drivers loaded?
What happens, exactly, when you run the code? Do you get any error messages? What are they?
Please post your code along with answers to these questions. Also provide any other specific information which might be necessary for us to assist you. Good questions can get good answers. Vague questions will only get more questions!
Lynn -
Help Using Labview to control Kikusui power supply with a PIA4850 controller
HI I need some help using Labview to control 4 Kikusui power supplies. We have a PIA4850 Kikusui power supply controller. I can use the visa test panel and see the PIA4850 but can see any of the power supplies. I have very limited use of Labview and only wrote a couple programs using GPIB. The PIA4850 is a USB controller and can control up to 32 PS. I can get it to work with a Excel demo software that came with the controllers so I know that it is working. Any help will be appreciated. I am using LabView 8.2 and have updated to the Ni-DAQ 9.0. I have a program that I need to incorporate the PIA4850 into once I figure out how to operate it. Thanks in advance.
HI and thanks for the help. I did get one power supply to work but have another problem. I need to control 4 power supplies at the same time and can only operate the one that is addressed N5!C1. If I set the other to N6!C1 and so on I get an error stating
“Error -1074135008 occurred at ki4800_2 Configure Voltage Level.vi Possible reason(s):IVI Error in the method "get_Item" in the component "Kikusui4800". E_IVI_UNKNOWN_CHANNEL_NAME: Unknown channel name (N6!C1)”
I am assuming that I should be able to change the node number and that will change the supply that I need to use. Everything works great if I use N5!C1 I can change any of the supplies to address 5 and can control it with no problem. I can even have multiple supplies with the same address N5!C1 (don’t think I should do that) and change them all at once. I need independent control of each supply.
I am in a pinch here and need to figure it out but could use some help. Any ideas will be greatly appreciated.
Thanks
GBlair
Attachments:
KIKUSUI PS.llb 179 KB
Kikusui Ps Controller.JPG 63 KB -
[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
Reporting Services 2012In 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
Reporting Services 2012 -
How to use labview with the handyboard
Hi,
how to use labview with the handyboard
Thx...I'm assuming you're talking about this, since you didn't provide a link for those of us who don't know what you're talking about.
As the other poster said, you didn't say how you want to use LabVIEW with it. If you want to write LabVIEW programs than run on the microprocessor, then you're out of luck. If you want LabVIEW to interact with it, then you've got a couple of options, SPI probably being the best, but it also has DI and AI that you could use to communicate with it - the DI's could be used as a parallel interface.
Message Edited by Matthew Kelton on 12-17-2007 02:21 PM -
How to use labview with gpib to connect with Agilent PNA E8362B ?
how to use labview with gpib to connect with Agilent PNA E8362B ?i am newbie ..just started to work on labview about a fortnite bck and +i am a novice in interfacing(networking... jst know tidbits) skill ..so plzzzzz explain me in a litle detail
Duplicate Post.
-
How to Use LABVIEW charts with Mathscript
Hi,
I recently tried to work on Mathscript and it is really amazing. what I tried to figure out is:
Instead of plotting using traditional "plot" statement, how to use LabVIEW chart ( I know how to Add output but the graph were not as expected
Is there any mean to get rid of this "Lengthy" delay that "ALL MATLAB User know" for first time compilation?
Thanks in advance
Waleed El-Badry MSc.,MCPD, ISTQB Certified Tester
Assistant Lecturer
Mechatronics Department
Faculty of Engineering
Misr University for Science & TechnologyWell Chris,
I was about to post the solution, but as I said, I'm in a middle of experts
It took me 3 hours to figure it out. I should've checked your answer . I resolved to the same suggesstion of yours. I only added some functionality to get the newbies like me being acquainting with how easy to work with LABVIEW mathscript based on MATLAB knowledge.
Waleed El-Badry MSc.,MCPD, ISTQB Certified Tester
Assistant Lecturer
Mechatronics Department
Faculty of Engineering
Misr University for Science & Technology
Attachments:
Play with Mathscript.vi 35 KB -
How to use labview to drive a New Focus Picomotor sinusoidally
Hello,
I am currently trying to use Labview to control a NewFocus Picomotor (Model# 8302)using the inteligent driver model 8753:
http://www.newfocus.com/products/?navid=3&theView=modelDetail&productLineId=6&productGroupId=195&mod...
http://www.newfocus.com/index.cfm?navId=97 (Using MCL with Labview)
Ideally I would like to modify a preexisting driver to drive the motor sinusoidally in the 30-70 Hz range with control over the amplitude. At this point, I am completely daunted by the complexity of the example files and have no clue where to start. Any assistance with this matter is GREATLY appreciated.
Best Regards,
BRoxBRox,
I had a look at the examples and obviously all it does is to communicate to the drive through RS232 with a proprietary protocol. With the documentation in the block diagram and the documentation of the protocol it shouldn't be too hard to understand what's going on, but on the other side NewFocus has obviously missed a chance to provide a high level and easy to use API for their product...
I can't dive too deeply into the features of this drive, but before you spend too much time on understanding their command language, you should check with NewFocus, if it is possible at all to meet your requirements with their hardware. The main reason why I doubt that is the slow communication speed provided by RS232. The only way to reach a sinusoidal motion profile of 30 to 70 Hz with this type of communication is running the complete trajectory generation and interpolation onboard. If you have planned to generate the motion profile in LabVIEW and send setpoint commands to the drive this will probably not work.
If the drive provides another command input (e. g. an analog +/- 10 V input for torque or velocity command signals), we can talk about alternative approaches.
Regards,
Jochen Klier
National Instruments -
How to use the custom control ?
Hi Friends,
plz help to use of custom control in screen painter ?
and how to use the custom control ?
Thanking you.
Regards,
Subash.HI,
Screen Elements
A screen can contain a wide variety of elements, either for displaying field contents, or for allowing the user to interact with the program (for example, filling out input fields or choosing pushbutton functions). You use the Screen Painter to arrange elements on the screen.
You can use the following elements:
· Text fields
Display elements, which cannot be changed either by the user or by the ABAP program.
· Input/output fields and templates
Used to display data from the ABAP program or for entering data on the screen. Linked to screen fields.
· Dropdown list boxes
Special input/output fields that allow users to choose one entry from a fixed list of possible entries.
· Checkbox elements
Special input/output fields that the user can either select (value X) or deselect (value SPACE). Checkbox elements can be linked with function codes.
· Radio button elements
Special input/output fields that are combined into groups. Within a radio button group, only a single button can be selected at any one time. When the user selects one button, all of the others are automatically deselected. Radio button elements can be linked with function codes.
· Pushbuttons
Elements on the screen that trigger the PAI event of the screen flow logic when chosen by the user. There is a function code attached to each pushbutton, which is passed to the ABAP program when it is chosen.
· Frame
Pure display elements that group together elements on the screen, such as radio button groups.
· Subscreens
Area on the screen in which you can place another screen.
· Table controls
Tabular input/output fields.
· Tabstrip controls
Areas on the screen in which you can switch between various pages.
· Custom Controls
Areas on the screen in which you can display controls. Controls are software components of the presentation server.
· Status icons
Display elements, indicating the status of the application program.
· OK field
Every screen has a twenty-character OK_CODE field (also known as the function code field) that is not displayed directly on the screen. User actions that trigger the PAI event also place the corresponding function code into this field, from where it is passed to the ABAP program. You can also use the command field in the standard toolbar to enter the OK field. To be able to use the OK field, you need to assign a name to it.
All screen elements have a set of attributes, some of which are set automatically, others of which have to be specified in the Screen Painter. They determine things such as the layout of the screen elements on the screen. You can set the attributes of screen elements in the Screen Painter - either for a single element, or using the element list, which lists all of the elements belonging to the current screen. Some of the attributes that you set statically in the Screen Painter can be overwritten dynamically in the ABAP program.
with regards,
sowjanyagosala -
Use Labview to control two Picomotor actuators successively through Model 8753 iPico driver
Hello All,
I want to use Labview to control two Picomotor actuators(belong to channel A ,C) successively through Model 8753 iPico driver.Since the example VI's
(Application.vi) from Newport's website just control one actuator at one time, so I copied the example code, thus there are two repetitive sections (see the attachment) in
the while loop structure. The test result was that two Picomotor actuators moved to respective target position circularly. And I found the test was correct when two Picomotor actuators belonged to different address. Can anyone tell why ,what should I do? Any assistance with this matter is greatly appreciated.
Best Regards,
Attachments:
control two picomotor actuators.vi 90 KBBRox,
I had a look at the examples and obviously all it does is to communicate to the drive through RS232 with a proprietary protocol. With the documentation in the block diagram and the documentation of the protocol it shouldn't be too hard to understand what's going on, but on the other side NewFocus has obviously missed a chance to provide a high level and easy to use API for their product...
I can't dive too deeply into the features of this drive, but before you spend too much time on understanding their command language, you should check with NewFocus, if it is possible at all to meet your requirements with their hardware. The main reason why I doubt that is the slow communication speed provided by RS232. The only way to reach a sinusoidal motion profile of 30 to 70 Hz with this type of communication is running the complete trajectory generation and interpolation onboard. If you have planned to generate the motion profile in LabVIEW and send setpoint commands to the drive this will probably not work.
If the drive provides another command input (e. g. an analog +/- 10 V input for torque or velocity command signals), we can talk about alternative approaches.
Regards,
Jochen Klier
National Instruments
Maybe you are looking for
-
Adobe InDesign CS6 has stopped working
Activated Creative Cloud membership a few days ago. Installed Indesign first and it worked fine. Installed all the rest of the applications and now InDesign no longer works. It starts up and goes through all of the initialization and then right after
-
hi experts, i could able to get print out in quality but not in production. i maintained message data in nace same as quality. any inputs from your side thanks and regards satish
-
Urgent !! - Where can I download Timeten 6.0.2 (For development)
Dear all, Does anyone know where to download timeten database version 6.0.2 for solaris(sparc) In OTN, they only provided 6.0.4 and 6.0.3 only, but I must to use 6.0.2 version. So, please help me to find the older one.. Thanks in advance Patchara
-
Getting rid of stupid animation
Before I expire from old age I would love to know how to turn off that ridiculous animation whenever I browse for a file. You know that stupid, useless, horrible animation where the file list or whatever is conveyed to you via some Star Wars movie of
-
Hi, I am studying the migration of Oracle's Forms6 onto the web and therefore I'm looking for the best way to do so. I have little experience and I'm glad for any help. Are there any existing applications?