Questions tagged [ev3]
EV3 is the 3rd generation of LEGO MINDSTORMS, released in 2013.
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How can I program two ev3 bricks at the same time with one program? [duplicate]
I want to be a program two EV3 bricks in Lego Mindstorms Education Ev3 software
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Mindstorms EV3 brick doesn't start up
When attempting to start your Mindstorms EV3 brick, the light turns red briefly and then turns amber (yellow or orange?) and stays that way indefinitely. The screen does not turn on at all. Any ideas ...
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What is the best way of emulating a Ev3 brick?
The main goal: emulate the work of a EV3 brick so then I would use it as a part of the simulator.
The problem: I don't know the best way of doing this.
About a year ago I asked about the memory ...
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EV3 Color Sensors Disconnecting
My EV3 color sensors disconnect a fair number of times. What can I do to prevent this from happening apart from changing the sensors and cables?
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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 ...
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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....
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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 ...
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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 ...
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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? ...
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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", ...
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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 ...
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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 ...
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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(...
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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 ...
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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 ...
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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; }
...
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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 ...
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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?
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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 ...
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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.
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
...
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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 ...
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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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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 ...
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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 ...
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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 ...
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"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 ...
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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, ...
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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 ...
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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 ...
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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.
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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.
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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 ...
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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 ...
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"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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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