Questions tagged [ev3]
EV3 is the 3rd generation of LEGO MINDSTORMS, released in 2013.
432
questions
4
votes
1answer
60 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 ...
2
votes
1answer
69 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 ...
5
votes
1answer
241 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 ...
2
votes
1answer
29 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 ...
3
votes
1answer
80 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 ...
2
votes
1answer
38 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 ...
4
votes
1answer
42 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?
1
vote
2answers
87 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 (...
7
votes
1answer
100 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 ...
2
votes
2answers
86 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 ...
2
votes
1answer
71 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 ...
4
votes
1answer
160 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 ...
2
votes
1answer
61 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: ...
3
votes
3answers
126 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.
...
1
vote
1answer
62 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 ...
0
votes
1answer
29 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....
2
votes
1answer
53 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 ...
3
votes
0answers
44 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 then move the file to the robot. But since I'm on chromebook I don't see ...
6
votes
1answer
69 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 ...
2
votes
1answer
187 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 ...
1
vote
1answer
31 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, ...
6
votes
1answer
131 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 ...
1
vote
2answers
89 views
0
votes
0answers
35 views
Data logging with a custom sensor like Pixy2 camera
I am trying to use data logging functionality in EV3 LabView using Pixy2 camera, but I get this error when I click on download and run …
Unable to compile some documents for deployment:
Experiment....
9
votes
2answers
460 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.
3
votes
1answer
182 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 ...
8
votes
1answer
141 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 ...
4
votes
1answer
197 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 ...
1
vote
1answer
51 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:
...
7
votes
1answer
477 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
1answer
134 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 ...
6
votes
1answer
175 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 ...
5
votes
1answer
113 views
Lego RCX to NXT converter cables not working properly with EV3
I recently got some of these cables(see picture below) to control an old RCX motor. Some things to note before reading on. I tried both the medium and large motor blocks and played around with power, ...
1
vote
0answers
196 views
Strange blocks appeared in my program
In my Mindstorms program, I found these strange blocks. They appeared when I sent this program to my other PC on Windows 10, which is more powerful. They don't work and I can't change them. Mindstorms ...
0
votes
1answer
165 views
EV3 Folder not appearing on Windows
I am attempting to load a UF2 file into an EV3 robot, however when I plug everything in, nothing appears. Windows recognises that a device has been plugged in, and it even appears in the Device ...
3
votes
0answers
58 views
EV3 motor port works in motor control but not in demo mode
I have a new EV3 set and tried running the Demo program on the initial build. Only the left motor turned, so the robot kept going in circles instead of going straight like its supposed to. When I ...
1
vote
0answers
67 views
EV3 square pattern motion [closed]
I'm trying to make my EV3 robot move in a square path, and an infinity path.
I've tried this code for a square path but it's not working.
0
votes
0answers
38 views
Infrared Sensor Activation Problems
I tried running my program that requires an infrared sensor, but it didn't work. I looked at the port view and I saw the infrared sensor. It was connected, the brick recognized it, but had a "---&...
0
votes
1answer
94 views
EV3 Gyro sensor is not working
I started using the EV3 Gyro for the first time in a few months, and it's not working. When I rotate the robot the output shown in the EV3-G port view stays at zero. In the rare case it registers some ...
6
votes
3answers
256 views
Distance Learning Mindstorms web-based software
I am a Technology education teacher from NJ and I use Lego Mindstorms for my 8th-grade robotics class. Since we are doing distance learning (teaching from home) my students have not been able to ...
4
votes
1answer
543 views
Is there a duplicate/copy paste function in Lego Mindstorms Ev3 programing?
I remember, when I first started out Lego Mindstorms, there was a copy and paste (duplicate) blocks function. I could highlight and right click the blocks then press on duplicate to make another copy ...
4
votes
4answers
530 views
How to prevent my connected axles from falling apart?
In my EV3 robot, I have two rear axles connected to each other using this part mounted like this:
[
The problem with this construction is that after a while of driving, the axles disconnect like ...
1
vote
0answers
60 views
SPIK3R can't even hold itself [closed]
The SPIK3R does not move properly. When I remove the legs and depend on the wheels it works like it should: goes forward when I make it go forward, and turns when I make it go backward. I did not make ...
3
votes
1answer
69 views
Error message when using loop index as an array index to get value in arrays
My program moves an ultrasonic sensor around 260 degrees and the values are recorded down in an array variable every 2 degrees it turns. It moves back and measure it 3 more times, storing each ...
2
votes
1answer
101 views
Is it okay to put rechargeable AA batteries into the EV3?
Is it really okay to put rechargeable AA batteries into the EV3 and continuously put them in after recharging them each time? Boring old one-use AA batteries are getting too expensive for me, and I ...
1
vote
0answers
49 views
EV3 menu tabs occasionally vanishing
When I say "EV3 menu tabs," I'm referring to this part:
And sometimes it disappears, just like the title says.
After testing the EV3, I concluded that there are certain circumstances where this ...
1
vote
2answers
229 views
How do you display multiple items at once on an EV3 screen?
I'm trying to make a program on the EV3 that will imitate the shutdown process.
At first, I wanted to make my life easier by naming the program "Shutting Down" and not interfere with the display in ...
0
votes
1answer
1k views
How do I remove programs from my Lego Mindstorms EV3 project?
The title says it all. But to be more specific, I find it annoying that I have to download one single program to the EV3 Brick but then all the others in the project end up in the brick too, therefore ...
2
votes
0answers
179 views
How to get Lego Mindstorms EV3 expansion set (45560) programmes in Scratch
I bought recently Mindstorms EV3 expansion set (45560) and found out that the available programs are written in old LabView-style programming language: https://le-www-live-s.legocdn.com/sc/media/files/...
0
votes
0answers
165 views
Given program for EV3 Race Car doesn't work, but why?
I have successfully built an EV3 Race Car with instructions from a fan-made book made by Laurens Valk. In the book, he tells how to make my blocks for the rack-and-pinion steering and how to make a ...