LEGO MINDSTROMS

Hi, I have finished the program in LabVIEW to manage robotic car using two touch sensors .
Program to do the following :
1 The Power variable holds the
current power level selected
by the user ( 0-100 ) . Start at 80
The variable holds TargetSteer
The steering motor angle That
the main sequence above is
Currently asking for , Which can
range from -75 ( left ) to 75 ( right ) .
Start at 0 for straight ahead .
2 If the Left Arrow button is bumped then subtract 20 from Power and write the new value back into power . If the value gets less than 20
then set it back to 20 with That 20 is the minimum allowed power . Confirm the button press with a beep .
3 If the Right Arrow button is bumped then add 20 to Power and write the new value back into power . If the value gets greater than 100
then set it back to 100 to 100 That is the minimum allowed power . Confirm the button press with a beep .
4 Display the current power on the screen before it and
some spaces after it to Ensure That the previous value is erased .
5 Test both touch sensors by doing and switch on sensor 1 , then resulting in both paths , and to switch on sensor 4 , Which results in four
possible paths Corresponding to the four button combinations ( both , left only , right only , neither ) . In each case , perform the action :
Both Pressed : TargetSteer Set to 0 ( straight ahead) and apply the selected power to both motors to go straight .
Left Pressed : Set TargetSteer to -75 (full left ) to send Power and Power C / 2 to B ( rear wheel power difference assists the steering )
Right Pressed : Set TargetSteer to 75 (full right ) , send it Power and Power B / 2 to B ( rear wheel power difference assists the steering )
Neither Pressed : TargetSteer Set to 0 ( straight ) and stop .
6.Get the current steering angle from its motor rotation sensor , then subtract That from
The Desired steering motor angle in TargetSteer , and use it That Determine how much
power and what direction to turn the steering motor to get to the Desired angle .
The power used is proportional to the angle difference , Which produces a smooth
progressive motion . The duration is Unlimited, with the power will just be briefly
updated , and then the loop will repeat and re -calculate a new power . As the steering
Desired approaches the angle , the power will reduce until it reaches 0 power at the
Desired steering and will stop there . If it overshoots , opposite power will bring it back .
The angle difference can be either positive or negative, with the motor direction is
Determined by testing to see if the difference is greater than zero or not , and the Motor
block 's Power port will take the absolute value of the power in wired .
Some of the steps and some do not know I certainly wrong. I am a beginner in labivew . Please find attached my program . Please help me with it .
Thank you
Attachments:
Prakticka cast BP pokus 2.vi ‏33 KB

This article is intended to control the direction and speed of a Lego NXT robot using the directional buttons on the computer keyboard, the remote control of limited strategic scope of the Bluetooth transmitter installed. I hope it will be useful, greetings
https://decibel.ni.com/content/docs/DOC-36250
Atom
Certified LabVIEW Associate Developer

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LEGO Mindstorms 2.0 crashes at startup when LabView Signal Express is installed first

When NI Circuit Design Suite Education Edition is installed first in a computer and the LEGO Mindstorms software second, the LEGO Mindstorms software doesn't work, it reports the following:
Error: A required file is broken
Possible Solutions: Reinstall the LEGO Mindstorms NXT Driver (tried but doesn't work)
Error code: 1003
Ordinal not found
The ordinal 18 could not be located in the dynamic link library NIVISV32.dll
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On other computers the LEGO software starts running, it displays part of the initial screen and then a small window opens saying that the Mindstorms software has has an error and that it will close. The previous report doesn't show.
If LabView Signal Express is uninstalled and then the LEGO software reinstalled, the LEGO software works.
I've dowloaded and installed new and old versions of the NIVISV32.dll and this doesn't correct the problem. I went as far as version 4.20 of the dll because it is dated in 2007 and the dll file installed by the LEGO software when it works is also dated 2007, but if I install the dll without uninstalling LabView Signal Express, the LEGO software continues not working.
Please advice how to correct this problem without having to uninstall LabView Signal Express first. If the LEGO software is installed first, is LabView Signal Express going to use and not to replace the old 2007 version of the dll installed by the LEGO software? Is there any LEGO software update that corrects this problem?
I repeat: I know a solution is to uninstall LabView Signal Express, install LEGO Mindstorms and then reinstall LabView Signal Express but I have 60 computers already cloned and deployed with this problem, so I don't want to go to this long process to fix the problem. The computers are using Windows 7 and problems happen on both the 32 and 64 bits versions of Windows 7.
Any ideas???
Solved!
Go to Solution.

I couldn't reproduce the error either, but in our x86 computers this problem appeared after several months; we used LEGO Mindstorms last time in Summer 2011 without any problems and just three weeks ago when we were checking the computer for our Summer 2012 classes if when we noticed the problem. I’m still going to try to reproduce the error in an x64 computer where the problem appeared immediately.
Anyway, I’m attaching a word file with images of captured screens where you can see the error reports generated by LEGO Mindstorms and a series of steps uninstalling and reinstalling these program plus LabVIEW, until LEGO Mindstorms finally works after having uninstalled all traces of LabVIEW.
Images can be expanded and zoomed in to a better view of the details and if I can reproduce the problem in an x64 computer I’ll let you know.
Please see if you can find out something based on the images I’m sending.
Thank you.
Attachments:
LEGO PROBLEM.doc ‏3129 KB

Installing LEGO NXT-G 1.1 or 2.0 on mac OSX 10.6

Hello LabView, I recently did a fresh install of Mac OSX 10.6 Snow Leopard
Since then i'm unable to install the LEGO Mindstorms NXT-G 1.1 software (by LabView)
It appears that the same is true for the latest version of NXT-G 2.0
In both cases, a dialog box state that installation was successfull yet the application folder only has an Engine folder and couple other files but no App ICON
Any idea if a 10.6 patch is underway to install either NXT-G sofware on my mac?
Solved!
Go to Solution.

I want to clear up any confusion of what software and versions referred to in this thread. There is no version 2.9 for both LEGO MINDSTORMS NXT and the LabVIEW Toolkit for MINDSTORMS NXT. The versions and supported operating systems are summarized bellow (Mac OS = 10.4 and newer; Windows = XP, Vista):
LEGO MINDSTORMS NXT 1.0 (1.1) - Supported on Mac OS and Windows
LEGO MINDSTORMS NXT 2.0 - Supported on Mac OS and Windows
LabVIEW Toolkit for MINDSTORMS NXT 1.0 and 1.0.1 patch
LabVIEW 7.1 - Supported on Mac OS and Windows
LabVIEW 8.0 - Supported on Mac OS and Windows
LabVIEW 8.2 - Supported on Mac OS and Windows
LabVIEW 8.5 - Supported on Mac OS only
LabVIEW Toolkit for MINDSTORMS NXT 2.0
LabVIEW 7.1.1 - Supported on Windows only
LabVIEW 8.5.1 - Supported on Windows only
LabVIEW 8.6.1 - Supported on Windows only
LabVIEW LEGO MINDSTORMS NXT Module 2009 (Releases in October) LabVIEW 2009 - Supported on Mac OS and Windows
NXT-G blocks can only be created with LabVIEW 7.1. LabVIEW 7.1 may work on Mac OS 10.6, but since LabVIEW 7.1 was developed well before Snow Leopard NI cannot guarantee it will function correctly. The LabVIEW NXT Module 2009 does not support support the creation of NXT-G blocks.
To install LEGO MINDSTORMS NXT 1.1 on Mac OS 10.6 (Snow Leopard)
Copy all files from the MINDSTORMS CD to a folder on your desktop.
Open that folder and look under "Parts".
Locate MindstormsUnivEdu.pkg or MindstormsUnivRet.pkg.
Right-click (control-click) and choose "Show Package Contents".
Navigate into the Contents » Resources directory and delete the "preflight" file.
Close this package and run the meta-package (LEGOMindstormsEngRet.mpkg) from the desktop to install MINDSTORMS NXT.
To install LEGO MINDSTORMS NXT 2.0 on Mac OS 10.6 (Snow Leopard)
Copy all files from the MINDSTORMS CD to a folder on your desktop.
Open that folder and look under "Parts".
Locate MindstormsUnivEdu.pkg or MindstormsUnivRet.pkg.
Right-click (control-click) and choose "Show Package Contents".
Navigate into the Contents/Resources directory and delete the "preflight" file.
Close this package and run the meta-package from the desktop to install MINDSTORMS NXT
To install LabVIEW Toolkit for MINDSTORMS NXT 1.0 and 1.0.1 patch on Mac OS 10.6 (Snow Leopard)
Follow normal installation procedure
To install LabVIEW LEGO MINDSTORMS NXT Module 2009 on Mac OS 10.6 (Snow Leopard)
Follow normal installation procedure
Please let us know if these address all of your questions.
Cheers,
Mark
LabVIEW R&D
Message Edited by BLAQmx on 09-14-2009 11:17 AM
Mark
LabVIEW R&D

Photo attachment shows up as "lego" with "?" - no preview

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Could be many things, perhaps we should start with this...
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Hi. I have purchased Lego Indiana Jones for my Macbook Pro. On trying to install it, it is telling me it encountering an error. Does anyone know how I can get around this? Cheers

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I have this problem too the error message for me is error 36
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How do you add a third party sensor to LabVIEW for Lego Mindstorms?

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Hi Ethan,
As you can see from my Word document, I am a little light on the proper terminology. That's because LVLM comes with inadequate documentation.
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How do you create a double coloured outline on a font? e.g The Lego Logo has black and yellow

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Message was edited by: wobinido1

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Actually, I just saw this "lego" piece for a page using Silverlight, and I do not use click-to-play.
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I can't use the game Lego Indiana Jones 2 because, when the iMac is linked to the LCD tv, everything turns black, both on the iMac and the LCD
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Connecting LEGO mindstorms NXT to my computer

I am trying to learn Labview using the LEGO mindstorms NXT robot. I installed Labview 2009 and started working, but when I open the NXT terminal in the NXT module it claims that the NXT is not connected although it is (via USB). Any ideas ? Could this have to do with the fact that I am using Windows Vista ?
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This article is intended to indicate the installation and configuration process between LabVIEW and educational robot Lego Mindstorms NXT wirelessly, this will enable LabVIEW developers in having a mobile platform for the development of projects and autonomous robots, we need to install some programs the computer:
https://decibel.ni.com/content/docs/DOC-32448
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Certified LabVIEW Associate Developer

LabVIEW Toolkit for LEGO MINDSTORMS NXT in Windows Vista

Anybody knows how install LabVIEW Toolkit for LEGO MINDSTORMS NXT with Windows Vista?. Installing it gives me an error that says 'The windows installer is corrupt. To attempt to resolve the issue, please register the engine by running regsvr32.exe on msi.dll'. But it doesn´t work.
Thanks in advance

The work around for this issue is to install each of the MSI files setup.exe calls when running the installer. I was able to reproduce this issue for the 1.0 toolkit I was unable to do so for the 2.0 toolkit. This being said the instructions bellow are for those of you who are running into this issue with the 2.0 toolkit.
Listed bellow are the MSIs you will need to run (shown here at their default location after the self extracting EXE has been run). You should run these MSI in the following order.
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\MetaUninstaller\MU\MetaUninstaller.msi
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C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\NXT_Driver64\LegoMindstormsNXTdriver64.msi
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System Identification and Transfer Function of the LEGO MINDSTORM NXT Robot

Can anybody please help with the below question.
Using your LabView interface, input different values of power and record the output value of the number of wheel rotations. You can convert the latter into speed by measuring the diameter of the wheel. Then, type ‘ident’ in the command line of Matlab to launch a graphical user interface for system identification. Using the data collected for input power and recorded speed, you can derive the transfer function for your robot in the Laplace domain.
You will notice that it is possible to approximate the transfer function to a first order system.
Add disturbance to your system such as wind drag, road profile or friction. You might want to model the disturbance as a sinusoidal waveform.
Analyse the system response in LabView in order to tune the response.
Finally, write a LabView program to test your controller.
Set both Integral and Derivative to 0
Increase the value for Proportional controller to 0.5, 0.8, 1, 1.1, 1.3, and 1.5
Select a suitable simulation stop time.
Compare each simulation results and draw some conclusions.
Record the steady-state error. Has it dropped to near zero?
Record the rise time. Has it decreased to less than 0.5 second? And for what values of Kp?
Check whether this response is realistic i.e. a real cruise control system generally cannot change the speed of the vehicle from 0 to 10m/s in less than 0.5 second.
Adjust the gain (Kp) to give a reasonable rise time and add an integral controller to eliminate the steady-state error.
Change both Kp and Ki and see what happens to the response. When you adjust the integral gain Ki, start with a small value since a large Ki can destabilise the response. (Ki =0.001, 0.002, 0.003, 0.004).
Then you need to adjust both the proportional gain Kp and the integral gain Ki to obtain the desired response. Record the values of Kp and Ki that can meet all the design criteria.
Write the PID-feedback control LabVIEW program as described above.
Does it work? Quantify! Show us it is working
Hand in a short report on the PID project on the cruise control of the LEGO MINDSTORM NXT Robot. Your report should contain an introduction to cruise control and uses of PID controllers, a brief explanation of how PID feedback control works. The printout of the Block Diagram and Front Panel of your LabVIEW program should be attached at the end of your report.
Put it all together. There are many questions that can be explored and written up in the result section. Be creative.
Here are some things that may be addressed: Check whether your system can stabilise speed to within 1%. What are the optimal PID parameters that you have found? Can you choose PID parameters to both reach the set speed quickly and also maintain the speed within good accuracy once the system has reached the set speed? Can you control the speed of small steps? Explain your results?

Thanks for that.
DanHarryman wrote:
HI ToolMonkey
You should be able to build control system to do this using PID control VIs. The following paper is a good place to start when working with PID systems.
http://www.ni.com/white-paper/6440/en
Let me know how you get on using some of the functions in this.
Thanks
Dan.H
UKAE

Lego mindstorms: Is it possible to change the fixed user interface size of 1024 x 800 to smaller for use with netbooks?

I teach at a school that is using netbooks next
year - the screen size is 1024 x 576 for one model and 1024 x 600 for another model and color quality is 32 bit. To
our dismay, when we loaded Lego Mindstorms software to test it, we
discovered that the user interface is fixed at 1024 x 800, which means
the control panel at the bottom of the screen is inaccessible on the
netbooks. Is there a way to change the interface size so that we can
use the software on netbooks? This is a serious issue for us! Thanks
for any help.
I posted this question in the LabView for Lego Enthusiasts forum, but noticed that nothing new has been posted by the moderator since 2007. That's why I posted it in an active forum. Thanks.
Message Edited by mwert on 03-27-2009 11:33 AM
Melissa J. Wert
Technology Integration Specialist
Harpeth Hall School
Solved!
Go to Solution.

Hi All,
To echo Dennis Knight and as a FYI for others I refer everyone to KnowledgeBase 44DF7BQ0 How Does National Instruments Support The LEGO® MINDSTORMS® NXT Software And ...
Joshua B.
National Instruments
NI Services
NI Support Resources
NI Training Resources

When attempting to install Lego Mindtsorm 2010 Module I get error indicating need to install No Labview 32 Bit, I beleive I installed that too.

https://lumen.ni.com/nicif/us/evallegotoolkit/content.xhtml
I download files LVRTE2010std, and LVNXTModule2010_WIN and installed them but the second did not finish.
Matt Davis
LHS

Are you confusing this with LabVIEW for Lego MINDSTORMS? LabVIEW for Lego MINDSTORMS is a customized version of LabVIEW that is a complete development environment. It uses a customized version of LabVIEW.
The MINDSTORMS Toolkit, on the other hand, requires that you have the LabVIEW Development Environment.

LEGO MINDSTROMS

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