Questions tagged [ev3]

EV3 is the current generation of LEGO MINDSTORMS, released in 2013.

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Bluetooth connection to EV3 from Java on Linux/Android

I would like to connect to my EV3 from PC (and then Android) via Bluetooth. I was able to connect to NXT with LEGO-MINDSTORMS-MINDdroid which uses direct LCP commands but as far as I know the ...
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1answer
156 views

Do we need WiFi Dongle to install Scratch on EV3

I was wondering if I can install Scratch program on EV3 brick without the wifi dongle. Appreciate any insight here.
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1answer
531 views

Installed EV3 software on Win 8 and it won't load

EV3 software used to work on my laptop. Now it does not load any more. When I double click on the LEGO Mindstorms icon. It starts the procedure of loading the software. Then it stuck there and won'...
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1answer
820 views

DIY Ev3 from schematics

LEGO offers schematics for the Ev3 brick in their hardware developer kit accessible from the bottom of the Ev3 downloads page. (Files 1 and 2 in the zip) Do these schematics contain enough information ...
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2answers
197 views

A wired data logging brick

I need a data logging brick where I can wire an input to the file name. Is this possible? and if so how would I do this?
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1answer
2k views

How do I rename an EV3 project?

I can rename the program in the Home Edition software but I just can't rename a project. Please tell me how to do it. Thanks!
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1answer
765 views

Raw sensor question?

What is raw sensor and what is on port 3? Is this code only for robot to go completely straight without errors?
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1answer
1k views

Use legacy RCX sensors with EV3

In NXT-G, there was a "Legacy" Block pack which had blocks to allow for the use of RCX motors/sensors with the NXT, as long as you had a converter cable. However, the EV3 software does not have this, ...
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3answers
1k views

Does the Mindstorms EV3 software work on macOS Sierra?

I guess this is a continuation of these two questions: Does the Mindstorms EV3 software run on OS X El Capitan? Is the LEGO Midstorms EV3 software compatible with OS X yosemite? macOS Sierra was ...
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1answer
442 views

Color sensor use in Commander app

I'm trying to build the MindCub3r model shared online at http://mindcuber.com. It often has trouble scanning the cube so I wanted to check the output of the colour scanner by using the Commander app. ...
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1answer
137 views

EV3 program refuses to work

I downloaded a 67KB program into my EV3 block. However, the program refuses to work. The EV3 says "Main", the name of my program, but it does not respond otherwise. What is the problem, and how do I ...
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673 views

Ev3 spik3r mission 2 doesn't move

So I was building Spik3r and I thought I got mission 2 completed. Wheels are turning, legs are moving but the robot just does not move. It looks like the small wheels should be moving the robot but ...
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3answers
2k views

PC control Ev3 robot

I wanted to see if I could control my robot with a PC and I wanted to know if there was a way to do it. I have already searched for a controller for the PC and didn't find anything.
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1answer
266 views

How can I make an EV3 vehicle follow an elliptic equation?

Has anyone succeeded in having the EV3 driving base moving following an ellipse? I would like the kids to think about how would we program a satellite orbiting around earth. They would input the ...
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1answer
3k views

How can an EV3 motor “remember” it's starting position?

I am currently working on a project that uses large motors. I want the project to return to a "starting position" (0,0,0) at the touch of a button so that it can be used multiple (identical) times. ...
7
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1answer
7k views

How do you program mindstorms to keep doing a task until either the IR OR the colour sensor state changes

How do you program mindstorms to keep doing a task until either the IR OR the colour sensor state changes. I would like to use the wait block but it can only be either the colour sensor or the IF ...
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1answer
359 views

What files are required to run an ev3 program?

I'm working on a project that aims to help beginning Lego Mindstorms programmers. I'm developing certain "modules" (moving straight, making a turn) for students to try, and I want to develop a program ...
7
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1answer
797 views

Understanding the makeup of an XML .ev3p file

When you unzip an .ev3 program, there are many txt and xml files that are inside. In particular, there is an xml file produced with the filename extension .ev3p, which seems to contain program ...
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1answer
4k views

EV3 won't connect through bluetooth anymore

I was using VS2015 (C#) to write simple programs for my EV3 using a bluetooth connection. This was working fine for several days and then suddenly stopped. I can't for the life of me figure out why. ...
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67 views

How do you get LEGO Education EV3 Software? [duplicate]

Does anyone know how to get it? I have a rough feeling that you get it by purchasing the product? Please help.
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1answer
2k views

Where can I find a good tutorial on programming with Lejos?

I want to get started with LeJOS and use Java to check to see if an EV3 touch sensor is pressed, but I can't find any decent tutorials. Are there any good resources for this?
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657 views

Sending Gcode to LEGO mindstorms x/y plotter?

I am building an x/y plotter out of LEGO Mindstorms. I would like it to read an SVG file on the EV3 brick, convert it to gcode, and draw the coordinates. How would I go about doing this?
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3answers
5k views

EV3 screen stuck at “Starting…”

After I turn the device on, its screen is stuck at "starting..." for a long time. It hasn't change into the regular screen, and the light behind the button was still red (didn't become green). Is ...
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2answers
3k views

Is it possible to access the RGB values of the EV3 Light Sensor?

I'm following a line with the LEGO EV3 Color Sensor in Reflected-light mode, I need to stop the robot when it detects a green tile in the ground, but I didn't succeeded in differentiating Green and ...
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1answer
1k views

How to parameter the ports in move tank block EV3?

How do I parameter the ports at Move Tank block (in My Block)?
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1answer
375 views

EV3 Installation failure on OSX El Capitan 10.11.3

Hi This is the first time I've tried to use EV3 software since upgrading to El Capitan. Before then, it worked perfectly. When I tried to launch the application a message pops up saying it has ...
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1answer
649 views

LEGO Color Sensor - EV3

My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?
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1answer
118 views

Why does display output affects motors?

I'm making a simple program with LEGO EV3 Education. It makes a little tank to follow a black line over a white-ish floor. Here it is: [] This works very smooth: it makes the tank follow the EDGE ...
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0answers
363 views

How to determine orientation of a EV3 gripper?

I have built the EV3 Gripper using the manual. I am programming an ev3 brick using ev3dev. I need to determine the angle/direction/orientation of the robot programmatically, before I can issue a ...
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3answers
895 views

Made a big program in EV3's programming software for AI creation and it went from slow to not loading

Made a big program in EV3's programming software for AI creation and it went from slow to not loading. It just displays the loading bar in the middle of the page. Even my lenovo windows 10 8GB RAM ...
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1answer
271 views

Loop doesn't work, always inputs the same condition

I have a loop but always inputs the same condition, please see the picture.
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0answers
91 views

HiTechnic Color Sensor analog

HiTechnic sales support said that HiTechnic color sensor hasn't been manifactured yet. Currently it's out of stock in HiTechnic shop. Is there any analog of this sensor except NXT/EV3 color sensors?
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1answer
620 views

Infrared sensor behavior

I'm developing a small program with the LEGO's Ev3 development tool. I'm trying to make the robot rotate, 30° at time, and if the infrared sensor detects something then make something and stop. Here ...
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2answers
942 views

How to store a matrix of values and pick out certain elements and compute the difference?

I at the moment am trying to make an EV3 robot which is capable of following a gradient decent method. The idea was to store a discretized function in a 2D matrix, and make several lookups in that 2D ...
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1answer
7k views

Is there a changelog for any firmware updates on an EV3 brick?

When a firmware update is released for the Mindstorms EV3 brick, are there usually any changelogs for them explaining what's been added or changed? If so, where can they be found?
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1answer
157 views

Can I change the spec of a MyBlock [duplicate]

If I create my own block (MyBlock) with one param and later discover that I should have used 2 params or different icon or something like that, what do I do? Is it possible to change the existing ...
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1answer
3k views

LEGO Mindstorms EV3 crashes on OS X El Capitan

I get the following problem details, can anyone help me? Process: MindstormsEV3 [595] Path: /Applications/LEGO MINDSTORMS EV3 Home Edition.app/Contents/MacOS/...
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1answer
135 views

EV3 software crashes on Windows 8 laptop

My cousin has Windows 8 x64 netbook laptop. When he tries to start the application he gets .NET framework error and I can see following text in the log file: +000,016 >> MINDSTORMS EV3 launched ...
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1answer
175 views

No power to Mindstorm EV3 Brain

My 11 year old just spent her entire Christmas Day assembling the Mindstorm EV3 Reptar, but when we put batteries in the brain nothing happened. It didn't turn on, no lights, no sign of power at all. ...
2
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1answer
396 views

Direct/system command for reading the display buffer of EV3 bricks?

I recall being able to read in the display buffer of NXT 2.0 bricks over Bluetooth/USB by issuing Read IO Map system commands. I've looked through the bytecodes and communication documentation for the ...
2
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1answer
518 views

Controlling EV3 motors within VC++

I've got an application within some VC++ software (BCI2000). This is running on Windows 7. Although BCI2000 can run elsewhere, I'd like to stay on Windows. I've got an EV3 whose motors I'd like to ...
3
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1answer
516 views

How to fix the Gyro

Currently the gyro sensor connected to the EV3 brick doesn't really work. whenever the gyro is attempted to be used the robot will just sit and spin once it gets to where it needs to use the gyro. Any ...
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1answer
159 views

How do I add the lms2012 library as a dependency within Visual Studio

I'm following this question and am curious how I go about actually importing the following the necessary dependencies. I see this line: #include "ev3sources/lms2012/c_com/source/c_com.h" and have ...
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1answer
519 views

Which move block to use with Gyro?

We would like to make a series Gyro drive blocks. As a general rule what would be the benefits and drawbacks from using the move tank and move steer blocks? My basic design is to read the gyro and ...
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1answer
470 views

How to receive response from direct_command_reply from EV3 using Python?

I've established and tested a Bluetooth connection (by playing a tone) between EV3 and Mac running Yosemite with Python 2.7.11. I used file write as in bt.write(tone) in Python to play the tone ...
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1answer
1k views

Connecting EV3 to Mac over Bluetooth without Lego Mindstorms software

I am trying to connect the EV3 brick over Bluetooth to a Mac so I can use direct commands to send bytecodes. However, the Bluetooth connection remains active only through the Lego Mindstorms software....
2
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1answer
47 views

Cannot add instruction tiles to EV3 brick program.

I was using the EV3 brick program software included in the ev3 Brick and I can no longer add instructions. I think I've reached the max length. Is there a way around this? Can I run a second program ...
4
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1answer
108 views

System files deleted somehow

I think my son accidentally deleted all the system sound/image files, etc. I have tried loading the firmware but that does NOT restore the files. Is there not a way to just upload the system sound and ...
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2answers
3k views

Sort the program list on EV3

When uploading a project to the EV3 brick, is there a way to control the sorting order of the programs on the brick? E.g: Prog_1 Prog_2 Prog_3 ... When playing a robot match in FLL one often needs ...
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1answer
67 views

DNX on LEGO Mindstorms

I am not familiar with ARM development but I am wondering would it be possible to compile DNX against LEGO Mindstorms EV3 processor. I know there is some ARM support and even there are some builds ...