General Mindstorms questions and compatibility. If the question refers specifically to the EV3, NXT, or RCX, then use those tags instead.

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How to use Power Functions with Mindstorms EV3?

Having learned that Mindstorms EV3 doesn't work directly with Power Functions, Q: Can you use Power Functions motors with the EV3 programmable brick? A: No, the connector does not match. I ...
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457 views

What can cause programmed NXT 2.0 motors to misfunction when small resistance is applied?

I have robot built per the Alligator tutorial included with Mindstorms NXT 2.0. Everything works correctly if I hold it off the ground and make sure there is no load on the two leg motors. However, if ...
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1answer
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Pass sensor or motor port number as a parameter

I want to create a block for one light sensor or one motor separately. Is it possible to give the number of the port as a parameter to a sensor or motor block via data wire? In NXT-G it was possible.
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391 views

NXT motors not moving?

I've been looking around the net for a solution to this problem, to no avail. After taking my NXT v1 out of storage, I tried using a motor, but it sortof just, moves back and forth once, then ...
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473 views

Program a full rotation of a NXT motor in X seconds

I'm interested in mimicking the functionality of the Arqball Spin, at $60 it isn't cheap so I'd like to make the most out of my Mindstorms parts. I'd like to use NXT-G to program a motor to rotate ...
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301 views

Does anyone make a self-driving car?

Mapping and localization are the hottest trends in robotics today. And what's more exciting is they can be both implemented with a low-cost robotics kit like LEGO Mindstorms! I tried to make a ...
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235 views

How to use NXT device as a keyboard key for computer

Is there any way for me to set up my Mindstorms robot so that when I push one of the touch sensors it sends a signal to the computer to press a key?
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Compatibility EV3 software with NXT brick - known limits?

Lego says I can I use the new software to program old NXT bricks: Q: Is EV3 backwards compatible with NXT hardware? A: Yes. You can program your NXT intelligent brick using the new EV3 ...
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573 views

Best sensor for balancing inverted pendulum

I want to build a balancer for an inverted pendulum. Which of the following sensors is best suited for detecting the tilt? Accelerometer Gyroscope Angle sensor
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Mindstorms 2.0 can't download to NXT brick with error 142023

Using Mindstorms education 2.0 on a Windows 7 computer I can't seem to get the program to see the NXT via USB or bluetooth dongle. When connected by USB nothing appears in the NXT window with device ...
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Where do I find Mindstorms building plans?

I have the Mindstorms NXT 1 kit. It includes a printout of the first robot model building plans. The plans for several other robots (e.g. the scorpion bot) are included in the NXT software. However ...
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Lego Mindstorm NXT cannot connect via bluetooth

I have an NXT mindstorm brick, running RobotC firmware. I am trying to connect to it, via bluetooth. At first, the problem was that I had the motorola drivers instead of ones from microsoft. Even ...
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How to program two NXT motors to run at the same time?

I'm working on a project with multiple axis of movement… trying to get two motors to run at the same time in order to achieve a mix of two!
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How to control a RCX from a Mindstorms NXT

I have both an RCX and an NXT. I would like to control the RCX brick from the NXT (and possibly communicate back to to the NXT from the RCX). I would like to avoid purchasing the Mindsensors RCX to ...
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216 views

Flash update breaks the Mindstoms NXT viewer

After udating to the lastest version of Flash on my Macbook Pro (OS X 10.7.4) The Mindstorms NXT software that comes in the box no longer displays the build instructions. It does load up, but the ...
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Bluetooth will not connect Error code: -142016

nxt 2.0 Error code: -142016 The Bluetooth does connect. I am not having these issues with any of my other Bluetooth devices running off of the same dongle. Where do I find the the meaning of any ...
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Lego Mindstorms NXT software error

I have installed the retail version of the NXT software. Due to pitiful performance on my Mac (OSX 10.7 Lion) I followed guidance on other forums and uninstalled Flash 11 and reinstalled 10. Now ...
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137 views

What's a good age to start getting into Mindstorms with my child?

What is a good age to start getting a child into LEGO Mindstorms? Also, how would you recommend introducing her? I can't wait to start building robots with my daughter. She loves LEGO and the idea of ...
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In lego mindstorm EV3, can you make the individual programs in a project into functions which can be used in the other programs?

The bit where you program what the robot does using your computer. I'm making a project and I can't fit it all onto the screen, so if you can't do functions, is there any way to zoom out of the screen ...
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Programming the NXT brick using an ipad app

for the past few years, I have been using netbooks to program the NXT. I would like to move into the 21st century and use ipads. Is there an ipad app for programming the NXT brick?
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Can you program an RCX using the Mindstorms NXT 2.0 software?

I was asked to teach a robotics class and found several RCX bricks in storage. Can I use these bricks with the Mindstorms NXT 2.0 software? If not, what would be the software I would need to use the ...
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155 views

Dimensions of Mindstorms NXT pieces

I don't have access to my NXT boxes at the moment (they're stuck behind a wardrobe that won't get moved for a week or so) and I'm working on this project where I need to know the dimensions of the ...
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Holonomic robots using Mindstorms

I just got some Rotacaster wheels and want to try building a 3 wheeled Mindstorms omnibot (holonomic robot) and I'm looking for a practical (easy) discussion about writing a driving program. I've ...
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How do I update my NXT firmware using EV3 software

The new EV3 software tells me to update my firmware on the NXT. When I go to the tools menu and select update firmware it tells me the NXT brick can not support this function.
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Mindstorms NXT Bluetooth Slow Connecting

I have just bought a NXT 2.0 and have installed the software on my laptop, and after some trouble getting it to connect I now have it connected any working using bluetooth. However it takes an age to ...
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In LEGO mindstorms NXT programming: is it possible to download a file from a robot onto the computer?

I've lost the file for a project, but the robot still has it, and I'm wondering if it is possible to transfer the file onto my computer from the robot, and continue to work on it. How would you do ...
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How can I find the analog output of a color sensor?

Could anyone provide me with an image of the voltage output of an NXT or EV3 colorsensor. I would like to have the analog output if it's possible, and not the digital output.
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Interfacing Mindstorms NXT 2.0 with webcam

I very recently started playing with Mindstorms and have used the sensors that was provided along with the NXT 2.0 set. I'm planning to work on something on the lines of image processing and I need a ...
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252 views

Help Installing NXT-G On Mac 10.6.x

I'm failing to install NXT-G on Mac 10.6.x. Whatever I try seems to end up with an error saying "A required file is broken" when I try to run the IDE. Could someone talk me through the steps please? ...
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385 views

How can I get replacement Mindstorms NXT components?

I recently have been trying to work with robotics, via the Mindstorms NXT kits. But as of lately it seems the physical components in the kit went missing (everything except the brick, cables, servos, ...
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254 views

Apart from the LEGO brick, is there any other hardware that has an NXT firmware written for it?

I am trying to find out if you can upload LEGO NXT byte-code to any other hardware, so I am just checking to see if anyone has ever written the LEGO firmware for any other hardware. Maybe hardware ...
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129 views

Mindstorms, black orphaned data wires

I've just copied a loop element, which had a data wire going into it. The internal wires (from the old external data wire) are now black, and I cannot delete them, or re-link them to a new external ...
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How to install NXT / EV3 software on Windows 8.1 RT

I have a 64 GB Microsoft Surface running Windows 8.1 RT. I am trying to install the old NXT 2.0 software and new EV3 software, but when I try to open the .exe file it says: This app can't run on ...
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1answer
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Installing Linux on my NXT

I have an old NXT laying around and I want to set it up with my printer so I can connect it to the cloud. In order to do this I need to install Linux on the NXT and connect the NXT's USB port to the ...
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1answer
88 views

Did all the nxt 2.0 lego content vanish from the Lego website?

I keep finding links to pictures and projects that evidently used to be on an nxt content site at lego. Is all of that information just gone? A site called nxtasy also seems to have vanished. Are ...
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Can I use the NXT 2.0 programming software with my educational set?

I have bought the 9797 NXT base educational set. It didn't include any software. I know that I can freely download the NXT 2.0 software (which was included in the 8784 retail set). Is it possible to ...
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1answer
278 views

NXT Bluetooth “Failed!” when turning on

When I attempt to turn on my bluetooth, the response on the display after about 5 seconds is "Failed!" Then I'm sent back to the main menu. I've reset the unit and updated to latest firmware (1.31) ...
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Bluetooth pairing successful in OSX but Mindstorms NXT software still can't connect

I'm using OSX Mountain Lion. I've installed the Mindstorms NXT software successfully using the NXT Script.rb script from Lego's web site, which is supposed to tweak the install so that it is ...
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119 views

Finding certain positions in a room?

I have LEGO NXT and a square room of 100x100cm. I would like to use the center of the of the room always as my starting point(the black box). The green box is going to be my park area. Circles can be ...
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1answer
908 views

On Lego Mindstorms EV3, is there a way to change the input parameters of a My Block?

I am writing a program for which I did a My Block. I later realize that I need to add a new input parameter and I can't find a way of doing this without creating a new My Block. This seems it should ...
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999 views

Unable to connect to NXT using NeXTTool via USB cable

For reasons beyond me, the NXC program MotorControl22.rxe in my NXT has disapeared. So i thought I'd just download it from my computer over to the NXT using NeXTTool. This is where the trouble ...
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1answer
62 views

How can I tell if my NXT motor is faulty?

I pulled my old Mindstorms NXT out of storage (it's been there for a few years). After patching together a test robot, I noticed that my motors behave strangely. At first, one of the motors did not ...
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NXT shuts down in 5 minutes

I have an NXT brick that will always shut down after 5 minutes. No, it is not the sleep timer. Documentation from the NXT Hardware SDK, page 17, states that if the ARM7 processor does not send back ...
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1answer
284 views

Robot that builds a copy of itself

I'd like to try building a robot that can build a copy of itself. Basically, I guess that involves: having some means of navigating around (i.e. wheels, tracks, something to move on) having some ...
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1answer
224 views

How to locate objects, and move towards them, without pre-programming the path

So I need to find objects in an enclosed area, I have access to the standard set of NXT sensors, i.e. ultrasonic/light. However, the ultrasonic sensors seem to be very unreliable and erratic, in ...
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Getting started with Mindstorms and/or Technic

I'm looking into getting started with LEGO. Can you briefly describe the difference between Technic and Mindstorms? I've read that the parts and compatible, so I suppose it's the functions that ...
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73 views

Resources to learn useful common Mindstorms mechanical construction patterns

I'm currently working on building a small scale CNC-like (X-Z, no Y axis) machine to cut glass mosaic tiles. I decided to give it a go using my EV3 set and I'm having some trouble with the Z-axis ...
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246 views

Vision Command and Exploration Mars software for Mindstorms RIS 2.0

I recently bought a set 3804 LEGO Mindstorms RIS (Robotics Invention System) v2.0 very well maintained but did not have the installation CD of the RCX program and IR tower. With some research on the ...
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Is there a fix for an NXT reporting “File error!” when running an EV3 program?

I downloaded the new EV3 software from Lego and installed it on Windows 7. The EV3 software runs. I plugged in an NXT using a USB cable. EV3 can edit the memory on the NXT and remove ...
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3answers
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Direct control of EV3

I need to control a car with an EV3 brick. I want to control it remotely. The trouble is, I'm using an education set so I don't have the remote. What means of controlling it remotely could I use? I ...