Questions tagged [ev3]

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

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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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5 votes
1 answer
83 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. ...
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3 votes
1 answer
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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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2 votes
2 answers
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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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2 votes
1 answer
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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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0 answers
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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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3 votes
0 answers
102 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 ...
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2 votes
2 answers
245 views

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

When I try to open my project it gives me 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 that ...
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3 votes
2 answers
151 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, ...
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2 votes
1 answer
141 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 ...
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4 votes
1 answer
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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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0 answers
111 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.
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3 votes
0 answers
72 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.
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4 votes
1 answer
150 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 ...
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2 votes
1 answer
52 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 ...
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1 vote
0 answers
163 views

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

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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0 votes
0 answers
102 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 ...
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3 votes
1 answer
290 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 ...
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4 votes
1 answer
70 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, ...
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5 votes
1 answer
91 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 ...
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2 votes
1 answer
585 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 ...
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5 votes
1 answer
261 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 ...
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2 votes
1 answer
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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 ...
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3 votes
1 answer
110 views

Can an EV3 power a buggy motor with the NXT to 9V extension cable?

On Philo's motor comparison webpage, https://www.philohome.com/motors/motorcomp.htm, it says that the buggy motor (42908 lego id, 5292 bricklink id) is not recommended to be powered by an RCX as the ...
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2 votes
1 answer
46 views

EV3 Brick: Powers on then off and won't stay powered on

I have an EV3 brick that when I press the power button the red lights all come on - the display shows starting up but after 3 seconds it powers off. The same happens when I press the power and right ...
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4 votes
1 answer
80 views

Can I use the EV3 IR Sensor with a power functions remote?

In other words, I want to control my Lego Mindstorms EV3 robot with my Lego Power Functions remotes. The EV3 has an IR sensor, and the PF remotes are IR Remotes, but will they work together?
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1 vote
2 answers
335 views

What is the max current for the LEGO EV3 motors (pin 1-2)?

The LEGO EV3 Hardware developer kit says that the first and second pin of output port provides a current of max of 700 mA with 1 A but the motors appendixes don't have the maximum current that can I (...
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7 votes
1 answer
140 views

What is the max current for the EV3 I/O port's VCC pin (pin 4)?

The LEGO EV3 Hardware developer kit says that the fourth pin of input or output port provides a voltage of 5 volts but doesn't give the the maximum current that can be drawn from the pin. What is the ...
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2 votes
2 answers
98 views

Is it possible to power supply an EV3 hub through the battery slot with 10 V?

I have two USB power banks that according to USB standard supply 5 V. I want to power my EV3 brick using my two USB power banks wired in series and to the EV3 battery slot. Can I power supply an EV3 ...
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2 votes
1 answer
108 views

How can I use the LEGO distance and color sensor from Power Up with the LEGO Mindstorms EV3?

I am asking how I can use the distance and color sensor from the LEGO Power Up series with my LEGO Mindstorms EV3. I know that they have different plugs but I am wondering if there is a solution to ...
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4 votes
1 answer
633 views

Is it possible to power an EV3 hub via USB?

I have a LEGO Mindstorm EV3 hub. I want to avoid buying rechargeable batteries by supplying power through battery box pins using an external variable power supply. Is it possible to supply power to an ...
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  • 149
2 votes
1 answer
96 views

EV3 force sensor - how to download the block to EV3?

I'm a twelfth grade student and I'm studying mechatronics and this is the first time someone from my school has used a force sensor so my teachers do not know how to help me. Can you please tell me: ...
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3 votes
3 answers
294 views

How to stop or freeze the EV3 large motor in position

How do I stop or freeze the large motor in a fixed position? I have a forklift type attachment that will lift to the precise height, but will not stay in position due to the weight of the attachment. ...
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1 vote
1 answer
84 views

Connecting EV3 with older motors using conversion cable

I'd like to use an EV3 brick to power an old 9V motor (74569). To do so I'm going to get one of these conversion cables (x1676) but I'm not 100% sure if it's possible to control the speed of the motor ...
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0 votes
1 answer
47 views

Bluetooth connection between an Android phone and EV3 brick?

I've paired my phone to the brick, however I was wondering if there were any resources out there regarding a simple android app to type something out on my phone and output it on the robots LCD screen....
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2 votes
1 answer
80 views

Is there a way to add a ultrasonic sensor on the ev3 COR3 robot?

When I built the COR3 robot I started to have some fun programming it. But then I wanted to add a ultrasonic sensor on my robot but I can't seem to find a way to place it on my robot. If you can ...
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3 votes
0 answers
84 views

How do I import my programs from makecode (Chromebook) to my EV3 robot

While using makecode I wanted to import my file to my EV3 robot but it says that I have to connect my EV3 robot to my computer and then move the file to the robot. But since I'm on Chromebook I don't ...
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6 votes
1 answer
97 views

EV3 .py to .rbf?

So, I need to send an rbf file from my computer to e-mail for a tournament. I'm currently using python with the ev3 microPython setup and vscode. The question is, where or how can I get the rbf file ...
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2 votes
1 answer
603 views

Am I able to use the Chrome version of the Mindstorm software on a Windows/Mac laptop?

We currently teach Lego robots as part of our Technology curriculum, but we are 1-to-1 in a BYOD environment. So we have all different types of devices the students use including Chromebooks, Windows ...
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1 vote
1 answer
37 views

EV3Dev Gyro sensor doesn't output values beneath 0

So, basically, my problem is that my Ev3 Gyro Sensor clamps outputs beneath 0 to 0. If I were to rotate my robot clockwise, the gyro rotation would go up, but when I rotate my robot counter-clockwise, ...
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6 votes
1 answer
859 views

How to run 2 motors at the same time in the new EV3 version?

So I've seen a question that solves my problem in an older version, which I don't think is possible in the Education EV3 Classroom - 1.2.2, which is the one I'm using. I want to simultaneously run 2 ...
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1 vote
2 answers
100 views

Who designed EV3RSTORM?

I wonder, who designed EV3RSTORM? I have searched on Google but no results.
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9 votes
2 answers
1k views

Programming on a chromebook with EV3

How do I install the new Lego block programming software on a chromebook? We have the standard version, but want the new one that looks like Scratch.
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3 votes
1 answer
280 views

Why does Pybricks on ev3dev have slow performance compared to EV3-G?

I got MINDSTORMS EV3 for my son and me. We installed Python (ev3dev) and ii seems to be running very slowly. I tried setting up the classic LEGO ev3g (block code), and that seems to run fine. Are we ...
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8 votes
1 answer
176 views

Help with my Ev3 printer

I'm building an image printer using my ev3 set and several more pieces, as a project to keep me occupied while I'm stuck at home. Here's how it looks: I've done the build part, the way I've chosen to ...
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4 votes
1 answer
303 views

Is there any cross compatibility between 51515 and 31313?

I'm thinking of buying another Mindstorms set, and I already have a 31313. I don't want to spend $370 just to learn they are completely incapable of communicating with each other, so if you could tell ...
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1 vote
1 answer
58 views

Why is my EV3 status light pulsing? (ev3dev)

I am using EV3 micropython (ev3dev?). When I upload the below program to my EV3, I see on the screen the usual play button image which looks approximately like the below ASCII art: ...
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7 votes
1 answer
1k 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 ...
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1 vote
1 answer
286 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 ...
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6 votes
1 answer
259 views

Why doesn't my LEGO Micropython remote control program work?

I am writing an EV3 micropython program meant to test my remote, but it does not work. When I run it, I see no errors at all. Instead, I just see a "play" symbol and the program continuously ...
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