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Questions tagged [ev3]

EV3 is the 3rd generation of LEGO MINDSTORMS, released in 2013.

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Heads Up! Could not open project! [duplicate]

I am a competititor of WRO (World Robot Olympiad) and I am using an EV3. I was programming yesterday and today when I opened it, it was unable to open and said: Heads Up! Could not open project!. I ...
Alex Z's user avatar
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How to fix this Error in EV3 Classroom? [duplicate]

So I got the error "Heads up! Couldn't open this project" and did research and found out that it is a generic error, then looked up the exact error on this site: https://legoapptools....
Joni's user avatar
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How can I convert EV3 Lab code to the new EV3 Classroom?

I have been running a robotics club at our local school for ~10 years, and just starting up again after covid. We are still using all our old EV3 kits, which work fine, but now have new laptops ...
Jeremy's user avatar
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3 votes
1 answer
62 views

Detect stalling Motor in the new EV3 Education Classroom

I have a gripper that should automatically stop closing when an object is grabbed. I achieved this in the older EV3 Home Edition by reading the motor current and comparing it to normal values. If it ...
grnx's user avatar
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2 votes
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How do I get a variable and image into the Lego Mindstorms EV3 image editor

I am making a project and I want the EV3 brick to have a GUI-like interface. It also needs to display a variable on the GUI. Is there a way to draw the GUI and have the live variable reading as well? ...
Michael Savage's user avatar
1 vote
1 answer
50 views

How do I make apps in Lego Mindstorms EV3 Education?

In the EV3 manual, it says you can create custom apps, in the same page as the IR control and Port View. How do you make a new app? I found a button under tools which says "Download as app", ...
Michael Savage's user avatar
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1 answer
83 views

Colour sensor is not working on Mindstorms EV3

If I plug the colour sensor into one of my EV3 bricks, on Port View it recognises it. However, on my other brick, it shows the colour sensor symbol but says unknown, and shows no reading. The colour ...
Michael Savage's user avatar
2 votes
1 answer
259 views

Trouble connecting NXT 2.0 block to Mindstorms Home EV3 software on Mac

My son has finally shown an interest in Mindstorms and we are trying to use an NXT block with my 2015 Macbook Pro (latest OS) running the EV3 Mindstorms home edition software. I have read in many ...
Jerry Davies's user avatar
1 vote
0 answers
64 views

Unable to open port error

Since today, no matter what program that uses sensors I try to run on my EV3 I get the following error: lejos.hardware.DeviceException: unable to open port at lejos.internal.ev3.EV3Port.open(...
celia's user avatar
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1 vote
1 answer
502 views

How to import a .ev3 project file into Mindstorms software

My son just built this Rubik's Cube solver and I wanted to help him with the software aspect of it. Despite being a pretty big computer geek, I'm stumped! The software instructions say to download the ...
Hendy's user avatar
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2 votes
1 answer
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What is the difference between LOCAL memory for programs and LOCAL memory for Direct Commands?

I've learned a bit about Direct Commands in EV3 and understood the work of Local and Global memory. Using the Direct Commands I can access the memory using an offset of the accessing byte/bytes (like ...
crackanddie's user avatar
3 votes
1 answer
99 views

Problem with emulating EV3 brick via wifi

I'm trying to emulate Lego EV3 brick connection via wifi. First I found the repo and rewrote it a bit in C# so now I have this: LabVIEW.cs public class LabVIEW { public string Serial { get; set; } ...
crackanddie's user avatar
1 vote
0 answers
46 views

How to fix torn EV3 LCD Cable [duplicate]

I accidentally tore my lego EV3's LCD ribbon cable while opening it. I found this post of someone a while back having the same issue, however as my tear is smaller I was wondering if it was possible ...
pythoncat's user avatar
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1 answer
174 views

EV3 gyroscope drifts when brick is still - what can be done?

The gyroscope value continuously increases/decreases, even when the brick is not rotating! What could be done in order to avoid, mitigate or at least reduce the impact of this behaviour?
Jme's user avatar
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Labview Developer mode for EV3 Classroom app

I found a trick to enable labview mode on EV3 Home Edition, however, I cannot find the LEGO Software folder in C:\Program Files (x86) (or C:\Program Files). In fact, I can't even Open file location on ...
Jme's user avatar
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33 views

Where do you find custom ev3 code blocks?

I've heard of people using custom-made ev3 (code) blocks in the software, but I don't know where to look for them. Can someone post relevant links? Specifically, I am looking for more technical blocks ...
Jme's user avatar
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ev3dev vs lejos - looking for a comprehensive comparison

Did anyone make a good comparison of these two environments? The most important factors to me are OS booting time, RAM usage, application start-up time,, compatibility with USB devices, and power ...
Adam S.'s user avatar
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Is there any way to unzip an ev3 file into text and xml files?

I would like to access the text file of the project files (.ev3p) to know their structure. But in the Mindstorms software, I couldn't find any way to download the .ev3p files.
theboguz's user avatar
3 votes
1 answer
655 views

Lego Mindstorms EV3 broken screen cable

While taking apart my EV3 brick I accidently pulled on the ribbon cable connecting the screen to the motherboard too hard and it broke. I figured I could just get a replacement fpc ribbon cable with ...
dkapur17's user avatar
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2 votes
1 answer
141 views

How can I export EV3 Classroom app project on Android tablet version of the app?

I need to submit EV3 code to enter a coding competition. The program is written in the EV3 Classroom app on a Samsung Android tablet. I tried to look for the file with .lmsp extension but cannot find ...
Sally Lau's user avatar
2 votes
1 answer
217 views

EV3 Education does not recognize NXT ultrasonic sensor

How do I get the NXT ultrasonic sensor to work in the Education EV3 Classroom application? OK: I have connected a NXT ultrasonic sensor to the input port 1 of an EV3 control brick. OK: For testing, ...
Torben Gundtofte-Bruun's user avatar
2 votes
1 answer
91 views

Direct command to set EV3 motor speed

I am trying to set a EV3 motor's speed and start it remotely using a direct command. Using the resources LEGO MINDSTORMS EV3 Communication Developer Kit (page 24) and LEGO MINDSTORMS EV3 Firmware ...
MaiTheLord's user avatar
4 votes
1 answer
215 views

EV3 with 6 motors

My son has made a crane with 6 EV3 motors connected to an EV3 hub. He's used ports A,B,C,D and 1,2. But two of them don't work. Are ports 1-4 just data ports for sensors, not motors? Is 4 the maximum ...
xanld's user avatar
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4 votes
3 answers
153 views

Is it possible to have a motor default to a certain position at the start of the code? I'm trying to use the motor as a servo, and it's annoying

The motor is attached to a "door", which rotates to block off an opening. I have it coded to manually go back 1/4 of a rotation, and the distance sensor attached will send it forwards 1/4 of ...
BJF's user avatar
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3 votes
0 answers
64 views

EV3 Port 1 connection issue

Port 1 on one of our EV3s is acting up. The port recognizes a sensor if the sensor is connected when powering up the unit, but if you unplug the sensor and plug it back in, the EV3 no longer ...
Jevons Paradox's user avatar
4 votes
1 answer
493 views

EV3 Device Manager ghost on my mac - how to remove?

TLDR: how to remove EV3 software completely from Mac? A year ago I got a used Mindstorms EV3 set, fired it up and played around with my son who was 8 at the time. I installed a setup where we could ...
Lxi Nuuja's user avatar
1 vote
1 answer
217 views

Is it possible to control the EV3 brick with a GUI on PC? If so hows the best way to go about it

I've been interested in controlling a machine remotely through a GUI and I am stuck in between picking Python or Java to do this project in but I also think the way I'm going about this would be all ...
Louie7's user avatar
  • 11
4 votes
1 answer
119 views

Accessing an EV3 brick on computer without MINDSTORMS Home

I am trying to hack my EV3, and I know I can make it execute commands I send via USB thanks to the communication developer kit. When I connect it via USB, it is only visible by the MINSTORMS Home app ...
Oxymore-coder's user avatar
5 votes
1 answer
138 views

EV3 Home Shuts down after 2 min. (lights orange, and 3 Icons Triangle, Gage, Manual)

I just purchased a second hand LEGO Mindstorms Home EV3. The brick turns on, allows firmware update, etc. However, after about 2 minutes the unit makes a noise, LED's turn red, and 3 icons appear. ...
Shed's user avatar
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3 votes
1 answer
128 views

When using Mindstorms Scratch-like development tool for EV3, is it possible to move a single or a few selected blocks somehow?

Say I have 10 random blocks in a line. Is it possible to move number 4 to position 1 without also moving block 5-10? As far as I have managed to move blocks all following blocks also gets moved even ...
GeeGee's user avatar
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2 votes
2 answers
313 views

Multiple Programming Blocks Running at Same Time

My team created a simple program to drive robot out. It consists of a MyBlock to drive straight a specified distance and speed utilizing the Gyro sensor. The program then activates a third large ...
John's user avatar
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2 votes
1 answer
381 views

Connected EV3 bricks don't react (EV3 Classroom)

I have a big robot that needs four big motors to drive it and two small motors for other functions -> I need two bricks to communicate with each other because they need to use the same sensors. I ...
Thomas's user avatar
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1 vote
0 answers
38 views

2 Questions, 1: LDD V4.3.12 not connecting to internet 2: I can't find any EV3 electric parts [duplicate]

(I'm new to LDD) Hi, I'm trying to use LDD for designing a robot for my Lego Robotics Class. It's just whenever I launch LDD, it just keeps saying that I'm not connected to internet and asking if I ...
PlasmaSyncz's user avatar
3 votes
0 answers
257 views

EV3 classroom cannot create New Project

EV3 Classroom V1.5.0 Windows 10 I run a lab of 24 laptops running EV3 Classroom v1.5.0. Over the last week, more and more computers are unable to create new projects and/or open existing projects ...
Jon's user avatar
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3 votes
4 answers
1k views

"Heads up! Could not open project" error message when opening project

When I try to open my project it gives me an error saying "Heads up! Could not open project". Could you please help me? Let me know if you want me to share the file. We were working on the ...
RAVI SAMBHARA's user avatar
3 votes
2 answers
504 views

Camera for Spike or Mindstorms for Streaming

I have made a few EV3/Spike robots that can be controlled remotely. They are controlled by either a PS4 controller or using a dashboard I built on a website. I'm running Python on the LEGO. However, ...
Adam's user avatar
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2 votes
1 answer
370 views

EV3 file opens to lobby and won’t open any of the saved programs on it [closed]

Help!! I am using the Mindstorms app on a HP laptop to program missions to an EV3 brick for a robotics team. We saved our programs yesterday after finishing programming a couple missions. Today, the ...
BRANDY's user avatar
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4 votes
1 answer
119 views

Transformer 45517: power supply or charger?

I would like to build a charging station for EV3 with rechargeable battery (45501). Does the transformer (45517) give a simple stable dc voltage (power supply)? Or does it provide a controlled voltage ...
Jean's user avatar
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0 votes
0 answers
191 views

Ev3 classroom 1.5.2.0 not working

When I try to create a new project or open an old project, the program does not work. We have 10 computers (desktops) with different versions of Windows 10 Stuck on this.
Marin Tzvetkov's user avatar
3 votes
0 answers
209 views

Delete projects from Mindstorms EV3 Brick

I am using Lego Mindstorms with https://makecode.mindstorms.com/ and once the projects are downloaded to the brick, I cannot delete them anymore.
hg Stephenson's user avatar
4 votes
1 answer
324 views

EV3 Classroom: Project, Programs and MyBlocks

There are two useful features in the EV3 MINDSTORMS (LabView-based) software, that do not appear to be in the EV3 Classroom (Scratch-based) software. We could create a project and write multiple ...
coolbot's user avatar
  • 41
2 votes
1 answer
75 views

How do you scroll the canvas in EV3 Classroom?

I have EV3 classroom installed on Mac. I am writing a pretty lengthy program that does not fit in a single screen. However, I am not able to figure how to scroll down or move sideways. This should be ...
Pavan's user avatar
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1 vote
0 answers
184 views

"Heads up! Could not open project" error message in EV3 software [duplicate]

Whenever we try to edit one of our old projects our EV3 Mindstorms Home software shows us the "Heads up! Could not open project" screen. What should we do? I am on the Mac OS Big Sur 11.2.3 ...
Spiritbot P.A.K's user avatar
0 votes
0 answers
143 views

EV3 brick unable to connect to EV3 Classroom v1.5 app

From Google Translate: My EV3 brick cannot connect to the EV3 classroom version 1.5 application, nor by cable, bluetooth or wifi. I haven't found a way to update the EV3 Brick from this app. How can I ...
Nasser's user avatar
  • 1
3 votes
1 answer
295 views

Is there any website or youtuber that can help me improve my building skills?

I joined the robotics team in my school and I find it really hard to cope with my friends when building. I need to improve my building skills before returning back to school. Is there any website or ...
user18986's user avatar
4 votes
1 answer
188 views

EV3 screen either flickering or blank, what do I do? [duplicate]

The screen on my LEGO MINDSTORMS EV3 brick has just stopped working. It is blank. I have tried turning it on and off, installed fresh batteries, and I can even hear the selection sounds. Additionally, ...
hydra games's user avatar
5 votes
1 answer
107 views

EV3 manual recording for displacement

So I'm doing this project using an EV3, here are the tasks of the project: We have to save the path that the robot will take manually ( we will move the robot by hand and it'll save the movements) so ...
Majed M.Alharthi's user avatar
2 votes
1 answer
2k views

How to resolve Studio's "unavailable color" warning for EV3 motors and sensors?

I have recently switched to Studio from Lego Digital Designer for designing EV3 robots and other mechanisms. It's a great program, but the color palette is driving me crazy. I want to add Lego EV3 ...
Kirkman14's user avatar
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5 votes
1 answer
278 views

EV3 not recognizing resistance correctly (MicroPython)

I recently tried measuring the resistance of a thermistor using the .resistance() method, the results are sadly not accurate. I measured the resistance with a multimeter and it showed 100kΩ, while the ...
C-Brick's user avatar
  • 53
2 votes
1 answer
46 views

LEGO EV3 Brick Type Data File not found

So this morning, I was going to build something with my EV3 kit, when I turned on the brick, the brick said 'Type data File not found'. Then I plugged in my touch sensor and all the motors in their ...
FaZe Crystal's user avatar

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