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Questions tagged [ev3]

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

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6 votes
2 answers
2k views

Port problem? Mindstorms EV3 brick doesn't detect sensor blocks

I've just bought a second hand Mindstorms EV3 home edition set but the ports aren't detecting any of the sensors just the motors. When checking the ports on the EV3 brick it says "none". I've updated ...
1 vote
2 answers
752 views

Mindstorms EV3 - Continuous low battery alarm

My son is facing an issue with his Mindstorms EV3. Every time he turns it on a low battery alarm is displayed and it shut downs. This happens regardless of the batteries, we have tried 12 different ...
0 votes
1 answer
167 views

Infrared Sensor Activation Problems

I tried running my EV3 program that requires an infrared sensor, but it didn't work. I looked at the port view on the app and I saw the infrared sensor. It was connected, the brick recognized it but ...
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 ...
0 votes
0 answers
26 views

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 ...
1 vote
0 answers
59 views

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....
1 vote
0 answers
50 views

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 ...
1 vote
1 answer
52 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", ...
3 votes
1 answer
64 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 ...
1 vote
1 answer
557 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 ...
0 votes
1 answer
97 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 ...
3 votes
1 answer
171 views

Anyone have the control block for the hitechnic color sensors?

I'm just wondering if anyone has a copy of the control block for the hitechnic color sensor v2? I'll take a v1 if you have that because I'm desperate at this point. The downloads page for it is down ...
0 votes
1 answer
261 views

Detect distances over 255cm with EV3 ultrasonic sensor?

In my use case, I have to detect things about 3-4 meters. I don't need to be accurate, +-2 or 3cm is enough. The EV3-G and most other places have a max distance of 255cm, which I understand that it is ...
4 votes
1 answer
504 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 ...
1 vote
0 answers
1k views

LEGO Mindstorms EV3: Camera recommendation for line tracking

I am planning to build an autonomous car in LEGO Mindstorms that will use ultrasonic or infrared sensors for collision avoidance and in the future also a camera for line tracking. I am now wondering ...
2 votes
0 answers
41 views

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? ...
2 votes
1 answer
299 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 ...
1 vote
0 answers
69 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(...
0 votes
5 answers
4k views

Every time Robot is launched (without changing the code) it is not following the exact path

I'm working on FLL mission and every time our team launches the robot (without changing the program, and we are making sure that it is starting from same location every time) it is not following the ...
2 votes
1 answer
103 views

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 ...
18 votes
2 answers
15k views

Export LEGO MINDSTORMS EV3 Lab Code

I was wondering if it was possible in any way to see the actual code that is generated by the Lego Mindstorms IDE. I know there isn't a direct 'export to code' option within the tool but I wondered ...
2 votes
2 answers
794 views

EV3 screen stuck at starting after inserting MicroSD card

I followed the official guide to download microPython and flash it onto an empty MicroSD card (SanDisk Extreme Pro 32GB), but the EV3 screen is now stuck at "Starting" after I insert the MicroSD card. ...
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; } ...
2 votes
1 answer
95 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 ...
6 votes
2 answers
6k views

How do I export LEGO Mindstorms programs on the Chromebook

There is now a Chromebook app to program LEGO Mindstorms. I have multiple kids collaborating on programs for FIRST LEGO League. Can they share the program between their Chromebooks? I don't see a ...
2 votes
1 answer
148 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 ...
3 votes
1 answer
696 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 ...
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 ...
2 votes
0 answers
190 views

Is the EV3 brick balanced? [closed]

Where is the center of gravity located on the ev3 brick? Is it at the center of volume, or is it off? Please note, I do not yet own an EV3 so I can't measure it myself.
0 votes
1 answer
184 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?
1 vote
0 answers
66 views

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 ...
0 votes
0 answers
37 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 ...
0 votes
3 answers
305 views

EV3 education brick doesn't work as is should

I have the EV3 education kit. When I create a program and upload it to the brick and run it, the first time it runs very well and the robot goes in a straight line, then makes a 90 degree turn. But ...
2 votes
2 answers
2k views

My EV3 program will not run despite clicking on the program from the brick

This is a new EV3 Education Core Set. I have made a simple move forward command using the Lego Mindstorm EV3 Students Edition and downloaded it into the EV3 brick. However when I press the program in ...
0 votes
0 answers
74 views

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 ...
0 votes
0 answers
83 views

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.
2 votes
1 answer
220 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, ...
4 votes
3 answers
154 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 ...
4 votes
1 answer
227 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 ...
10 votes
4 answers
17k views

How to install Firmware 1.10E on an EV3 home/retail edition brick

If and how can you install firmware 1.10E on an EV3 brick from an home/retail edition set (instead of an education set)? Updates 1.0E9 are only recognized from the Mindstorm software, also with ...
6 votes
3 answers
21k views

Is there a free EV3 simulator (virtual machine) for the Mac OS?

I recently saw this question on a virtual EV3 machine. From the video, I felt that this software will be great. However, I don't have the budget needed to buy a licence. Is there any alternative to ...
3 votes
0 answers
66 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 ...
7 votes
3 answers
3k views

How do I erase all old programs using the new scratch type Education software?

I have 24 Lego Mindstorms EV3 bricks that have old programs and the bricks are named. I want to erase them so they can be used for new students. In the older Mindstorms software I would just reinstall ...
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 ...
1 vote
1 answer
222 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 ...
4 votes
1 answer
122 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 ...
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. ...
2 votes
0 answers
247 views

How do I make a single arm double tap a piano key?

I am trying to make a Lego play piano from ev3, where I have connected two arms to a single motor on either side using Lego elements. Both the arms move counterclockwise to one another (if one plays ...
3 votes
2 answers
520 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, ...
2 votes
2 answers
316 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 ...

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