Questions tagged [ev3]

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

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votes
1answer
209 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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2answers
4k views

How can I create custom EV3 blocks (developer mode)?

What do I need to create custom blocks and in particular the VIX part?
2
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1answer
27 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 ...
9
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1answer
299 views

Is it possible to use EV3 MicroPython with Windows 7?

I have been trying to get python on my EV3 brick using an EV3 MicroPython SD card image as described on the Lego website. The EV3 brick seem fine with its new OS. Instead my problems are at the ...
1
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1answer
134 views

Converting a .ev3p file into a .ev3 project file

How do I convert a .ev3p file into a .ev3 project file? Everytime I click on the .ev3p file to open it, it just turns up as text in the notepad.
4
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1answer
38 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?
3
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1answer
77 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 ...
4
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2answers
588 views

Chromebook Lego Mindstorms EV3 trouble

I want to make a crane in LEGO Mindstorms EV3 and I've already downloaded the software but as you can see below some coding pieces here are not in the Chromebook version. Should I download the ...
2
votes
1answer
33 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 ...
11
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1answer
8k views

Is there a changelog for any firmware updates on an EV3 brick?

When a firmware update is released for the Mindstorms EV3 brick, are there usually any changelogs for them explaining what's been added or changed? If so, where can they be found?
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3answers
3k views

Does LEGO no longer support NXT 2.0 at all?

I am running Mac OS X 10.15 (Catalina) and the EV3 software can't detect my NXT 2.0 using USB.
17
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2answers
12k 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 ...
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2answers
71 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
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1answer
98 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
85 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 ...
4
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1answer
125 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
67 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
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3answers
7k views

Why I get this message saying “unable to compile some documents for deployment ev3”?

I have a LEGO Mindstorms EV3 program that I was working on for a long time but recently and suddenly when I try to download the program the software displays the following message: "unable to ...
2
votes
1answer
5k views

EV3 won't connect through bluetooth anymore

I was using VS2015 (C#) to write simple programs for my EV3 using a bluetooth connection. This was working fine for several days and then suddenly stopped. I can't for the life of me figure out why. ...
2
votes
1answer
58 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: ...
10
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4answers
9k views

Programming Mindstorms on a chromebook

I know there is no official way to program NXT/EV3 on a Chromebook. But a Chromebook can have Ubuntu installed via Crouton in developer mode. So, is there a relatively painless way to program NXT/...
3
votes
3answers
111 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. ...
8
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5answers
9k views

Is it possible to edit a MyBlock input parameter value?

I have created MyBlocks but want to change the input parameter to negative. Is this possible or must all the MyBlocks be re-written?
2
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1answer
80 views

EV3 program runs fine when connected to PC but does not respond when copied to the brick

I am building the race car mentioned in the LEGO Mindstorms discovery book using an EV3 brick. The problem I am facing is that the driving program runs fine when the brick is connected to the PC via ...
2
votes
1answer
51 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 ...
1
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1answer
59 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
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1answer
28 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....
3
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0answers
41 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
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1answer
64 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
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1answer
82 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 ...
3
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2answers
4k views

Can't get EV3 to work with touch sensors

My FLL team just got a couple of EV3 sets and the kids were trying to program a simple switch that has the robot drive into a wall, back up, and turn right once the touch sensor in the front is ...
1
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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, ...
9
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2answers
7k 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
1answer
106 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 ...
5
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4answers
11k views

EV3 Brick Error Symbols?

I am currently developing an EV3 robot that sorts colored technic beams. However, the brick will only run part of the program and then generate a strange error code on the brick's screen. The error ...
3
votes
2answers
725 views

Mindstorms EV3 unable to drive two motors simultaneously

Yesterday I had the basic driving robot with two large motors, but I could not get both motors running at the same time. I had the tank control programming block, with both motors set to 50% and when ...
4
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1answer
1k views

DIY EV3 from schematics

LEGO offers schematics for the EV3 brick in their hardware developer kit accessible from the bottom of the EV3 downloads page. (Files 1 and 2 in the zip) Do these schematics contain enough ...
3
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1answer
172 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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2answers
86 views

Who designed EV3RSTORM?

I wonder, who designed EV3RSTORM? I have searched on Google but no results.
7
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6answers
7k views

What are the programming languages that can be used on Lego Mindstorm EV3?

My son is interested in robotics. For me, I would like maximum flexibility for programming. For my son, I guess something simpler would be preferable so that his interest is not killed by complexity ...
0
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0answers
32 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....
8
votes
1answer
137 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 ...
9
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2answers
263 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.
2
votes
0answers
167 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 counter clockwise to one another (if one plays ...
2
votes
1answer
150 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. ...
6
votes
1answer
164 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 ...
1
vote
1answer
49 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: ...
4
votes
3answers
3k views

Sort the program list on EV3

When uploading a project to the EV3 brick, is there a way to control the sorting order of the programs on the brick? E.g: Prog_1 Prog_2 Prog_3 ... When playing a robot match in FLL one often needs ...
4
votes
1answer
184 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 ...
4
votes
1answer
354 views

Spik3r wheels move but the spik3r itself doesn't

Our Spik3r's wheels move but the Spik3r itself does not move. Please see the picture of the back of the vehicle - is it somehow incorrectly built?

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