Getting results to the Lego mindstorm NXT brick

In a nutshell, my group and I are trying to use eye movements to control the Lego mindstorm, ie look left turn left look right turn right etc. We will be acquiring the eye movement signals through labview signal express and running those signals into labview to move the NXT robot. We are in need of assistance in both the signal importing into labview and the subsequent utilization of the said signal by the NXT. We already have the NXT toolkit and are able to succesfully run basic programs. The problem we've had is that we need the results continuously imported into the NXT so that we can maintain control of the vehicle. So basically we need pretty close to real time results, sort of like a joystick type of thing. My group members and I have limited experience with labview so any assistance is appreciated.

Hello King945,
Here is a link that walks through sending and reading Bluetooth messages. I have also include a basic NXT Front Panel Control vi. The vi will work if the NXT toolkit is installed and if the NXT brick is wired to the computer through a USB cable. Also, if you integrate the Bluetooth messaging with this vi you should be able to control the NXT using front panel controls through Bluetooth.
Wear
National Instruments
Product Support Engineer
Attachments:
Front_Panel_Steering_Control.vi ‏102 KB

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System Identification and Transfer Function of the LEGO MINDSTORM NXT Robot

Can anybody please help with the below question.
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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).
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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
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UKAE

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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 ?
Thanks

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
Atom
Certified LabVIEW Associate Developer

NI LabVIEW 2009 LEGO MINDSTORMS NXT Module Released!

This software allows users to run code on their computers to control LEGO® NXT Bricks and compile, download, and run LabVIEW code directly to the NXT. The new NXT Module 2009 represents a considerable improvement in features and usability over past versions.
Totally redesigned APIs
Full access to LabVIEW debugging tools
Control NXT bricks either by running code in LabVIEW or compiling and deploying code to the NXT brick
VIs for TETRIX kits are available out of the box
Support for all LEGO® MINDSTORMS NXT 2.0 sensors.
NXT Applications Data Viewer, Piano Player, NXT Multimeter, Remote Control, and Scope
The module can be downloaded here.
Please feel free to ask questions and provide feedback to NI R&D.
Thanks,
Mark
Product Support Engineer - LabVIEW R&D
Mark
LabVIEW R&D

Nice! But I guess that doesn't mean that you will be releasing a free version any time soon... does it.
Oh! BTW (slightly off topic) you should remove the "Select Your Operating System" block on the Student edition cd order form. It just gets peoples hopes up that they might get a mac version.
Andrew
Message Edited by AndrewDudney on 10-22-2009 10:27 PM

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
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\MDFSupport\MDF\MDFSupport.msi
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\MDFSupport\MDF\EULADepot.msi
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\LVLEGONXTTK\LVLEGONXTTK\LVLEGONXTTK.msi
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\LVLEGONXTTK_LV71\LVLEGONXTTK_LV71\LVLEGONXTTK_LV71.msi
C:\National Instruments Downloads\LabVIEW\7.1\LabVIEW NXT Toolkit\2.0\Products\NXT_Driver64\LegoMindstormsNXTdriver64.msi
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Mark
LabVIEW R&D

NI LabVIEW Toolkit for LEGO MINDSTORMS NXT

Labview 7.1.0と一緒に、タイトルのtool kitを使って、
LEGO MINDSTORMS　NXTを動かそうとしているのですが、
一括コンパイル、nxt tool kit 1.0.1 patchコピーを終え、
"Getting Started with the LabVIEW toolkit for LEGO MINDSTORMS NXT"（添付）
の最初の"Building a LabVIEW VI that Runs on the NXT"に従って、
作成したVIをNXT上で動かそうとしたのですが、
Debugボタンを押すと、コンパイル、ダウンロードまではうまくいくのですが、
ダウンロードされたプログラムがNXT上で動作せず、動かそうとすると、
NXT本体のディスプレイにFILE ERROR!と表示されます。
NXTのバージョンは、1.03で、
"LabVIEW Toolkit for LEGO® MINDSTORMS® NXT"を
一括コンパイルした際には、次のようなメッセージが表示されました。
#### Starting Mass Compile: 2008年7月2日 18:41:42
Directory: "C:\Program Files\National Instruments\LabVIEW 7.1\vi.lib\addons"
Failed to load (C:\Program Files\National Instruments\LabVIEW 7.1\vi.lib\addons\NXTToolkit\shared\NXTToolkit.GetRelevantContexts_8_0.vi)
Failed to load (C:\Program Files\National Instruments\LabVIEW 7.1\vi.lib\addons\NXTToolkit\shared\NXTToolkit.OpenVIRefInContext_8_0.vi)
Failed to load (C:\Program Files\National Instruments\LabVIEW 7.1\vi.lib\addons\NXTToolkit\shared\NXTToolkit.RemoveScrollbars_8_0.vi)
#### Finished Mass Compile: 2008年7月2日 18:42:58
Labview 7.1では関係ないのかなと思っているのですが、関係あるでしょうか？
その他でも、不具合原因について、心当たりのある方がいらっしゃいましたら、
アドバイス頂ければ幸いです。
小松崎
添付:
LabVIEW_Toolkit_for_LMS_NXT_Getting_Started_Guide.pdf ‏201 KB

I do know of this one software where you can simulate the NXT, but it might only be for NXT-G programs.
SimplySim at The NXT Step
Other than that I don't think there's any way.
As for the difference between the two, there's a whole ton. Those are two different programs with very different syntaxes. Lego NXT-G is the basic software that comes with the NXT kit. It's a very scaled down version of LabVIEW and is pretty nice. LabVIEW is much more advanced and you can do much more with it, but you are restricted to using the LabVIEW NXT Toolkit and the NXT's cababilities. (no float, only so much RAM, etc.). But you can still do a ton more with it. Yes, you can data log with LabVIEW in, like, many ways.
Hope that helps!

Linux labview eval version for lego mindstorms nxt

Hi,
I'm a high school teacher in Tamil Nadu, India. Our school recently purchased 4 lego mindstorm NXT kits. We were happy to find that the new software was powered by labview, because it runs on linux. Our school runs on an Edubuntu LTSP network. So we were sad when we discovered the installation disk only supported MacOS and Windows.
I looked at the labview site for NXT and saw that we could get a student evaluation copy for use with NXT - so I filled out the forms, but when the link to the FTP site was given, it only provided a Windows and MacOS copy.
Can we obtain a student copy of labview for Linux for use with our NXT kits?
Thank you, Jason Stewart.

Hello Jason,
I'm sorry I didn't make this more clear in my previous post, but the LabVIEW Student Edition for use with LEGO® MINDSTORMS® NXT is only available for Windows. This will provide you with the LabVIEW 7.1 Student Edition and then you can download the LabVIEW Toolkit for LEGO® MINDSTORMS® NXT. This will give you the ability to create custom NXT blocks in LabVIEW.
Another option would be to purchase the latest LabVIEW Student Edition and then download the LabVIEW Toolkit for NXT. However, this edition is also only available for Windows. The customers that are downloading the LabVIEW Toolkit for LEGO® MINDSTORMS® NXT on a Mac OS have purchased the full version of LabVIEW for Mac.
Your best option would be to contact the NI India Sales Office at [email protected] or 91 80-4119 0000. They would be able to help you best with this.
Regards,
Clint M

Is Lego Mindstorms NXT 2.0 Mountain Lion Compatible?

Is Lego Mindstorms NXT 2.0 software compatible with Mountain Lion?
My son saved money for a long time and finally last week had enought to buy NXT.
I'd like to upgrade my Lion to Mountain Lion but since this NXT is the most important thing in house at the moment I don't want to ruin the experience with uncompatible OS.

I spoke at length with someone at Lego Mindstorms support. Unfortunately I didn't think to get his name.
He indicated that its a known crash with the NXT software and Mountain Lion bluetooth. However, he was unable to give me any encouragement regarding when it would get fixed. In particular, he indicated there is also a known issue communicating using broadcom bluetooth chipset which is used in Macs for the last several years. He said the NXT software has been broken talking to broadcom devices since 2007. Five years and no fix.
He indicated the software is a version of Labview written by National Instruments.
I've checked my systems. My 2012 Macbook Air and 2011 Mini use broadcom chips, while my 2007 white macbook has "cambridge silicon radio". I am able to communicate using my 2007 white macbook running snow leopard.
Overall I can't say I'm happy with Lego's response. It essentially sounds like their software has been broken for years and they haven't bothered to fix it. I'm personally in a bind since the system we had envisioned using for first lego league isn't practical to use without bluetooth. I realize bluetooth can't be used in competition.
It doesn't seem the Lego supports their NXT software well nor the Mac platform.

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Hi
I've installed the mobile toolkit in labview 2009 but when I created a new mobile project I didn't find the NXT Programmings category on menu.....
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Hi,
which NXT software did you exacly installed? LabVIEW Module for LEGO MINDSTORMS NXT or LabVIEW Toolkit?
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Licia

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Attachments:
NXTinstallErrors.doc ‏305 KB

Hi again.I did entpacking once more and tried to install it again. Now I got an error that LV2010 have to be installed before (LV2011 is already installed!) - see attached error message. So I Think that this package cannot be installed on LV2011. What do you mean? Walter
Attachments:
NXTinstallErrorLVnotInstalled.doc ‏155 KB

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orozcom

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Message was edited by:
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Getting results to the Lego mindstorm NXT brick

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