Questions tagged [ev3]

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

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452 views

Loop interrupt stops all loops, not just the one designated

I have been using loop interrupts for a while, and not had an issue... until now. And it is driving me nuts. My program has 2 main loops, titled "touch" and "end" with two more nested in the "touch" ...
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296 views

EV3 low battery communicate right after startup

I just bought an EV3 and started having battery problems. I am using 6 NiMH 1.5V batteries for my EV3. They lasted for around 10 minutes of work and went flat (that's what the EV3 kept saying but the ...
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34 views

Advanced mode in EV3 ultrasonic sensor

The EV3 Ultrasonic Sensor has an “Advanced mode" which measures either in centimeters or in inches. When exactly do you use this mode? Why doesn’t the sensor send just a single ultrasonic signal?
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What is the use of a single ultrasonic signal?

The EV3 ultrasonic sensor has an advanced mode that includes an option to use single or continuous sensing as described in the Help page: You can choose whether the sensor sends a single ultrasonic ...
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1k views

How can I make my robot heavier?

I'm building a 3kg LEGO EV3 sumo robot and I need to make it as small as possible. Which LEGO items do you recommend to add more weight on it? (tires, plates, wheels, blocks, minifigs etc.)
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1answer
60 views

Is there a way to convert .ev3 files to .uf2 files?

I am using Lego Mindstorms EV3 Education Edition and I am wondering if there is a way to convert the default .ev3 files to .uf2 files
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1answer
81 views

Two motors are driven forward, why are they rotating in different directions?

I have the Lego Mindstorms EV3 Pack and built a simple car with 3 wheels. The back wheels are motorized. When I run the following code: Motor.A.backward(); Motor.D.Backward(); both motors are ...
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2answers
136 views

Seeking HiTechnic Color Sensor V2 control block for EV3-G

I'm looking for the EV3-G control block for the HiTechnic Color Sensor V2, previously distributed by HiTechnic (https://www.hitechnic.com/cgi-bin/commerce.cgi?key=NCO1038&preadd=action), ...
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42 views

Release date for New LEGO® MINDSTORMS® Education EV3 Classroom? [duplicate]

What is the release date for LEGO® MINDSTORMS® Education EV3 Classroom for New macOS (macOS 10.15 Catalina)?
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1answer
156 views

Is the EV3RSTORM from Lego Mindstorms programmable using a real programming language? [duplicate]

I'm a software developer and Lego fan. I'll create a robot with Lego Mindstorms, but I'll like to know that the is EV3RSTORM is programable using a real programming language (Python, C#, JavaScript, ...
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Could Microsoft MakeCode be an alternative to the EV3 program?

Is it possible to use Microsoft MakeCode for the EV3 as an alternative to the widely used EV3 program by LEGO? What are the benefits and drawbacks?
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1answer
62 views

Can you change the sensitivity of an EV3 Touch Sensor?

My son is making a LEGO pinball machine and is wondering if it is possible to increase the sensitivity of an Ev3 Touch Sensor as when a ball hits it? Or does he need to use Color Sensors?
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92 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.
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1answer
85 views

how to send direct command to ev3 brick

I am new to ev3 python but am working on a project. I was reading about NXT-python that " It works by sending the direct commands detailed in LEGO's "Blue-tooth Development Kit" to the NXT brick" I ...
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5k 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 ...
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When the Chromebook crashes after coding the color sensor switch, what can I offer students to do for troubleshoot this consistent problem?

When students use the switcher block to program the color sensor on their Chromebooks, the app crashes. We have all accessibilities turned off and ChromeOS updated. What other troubleshooting steps ...
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1answer
44 views

Is it possible to use multiple IR beacons on different channels to control EV3?

One IR beacon has very few buttons and I would like to buy additional beacons and use them simultaneously to be able to control more channels. I can't find any information if this setup will work. ...
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1answer
33 views

can ev3 switch block take inputs

Is it possible to input values into a switch block? For example, if I have a move steering block in switch statement, can I input a value for power from a math block outside the switch statement? If I ...
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1answer
45 views

EV3: Detect distances over 255cm with 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 ...
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27 views

How to import file to Mindstorm Programmer?

I got a Mindstorm set a year ago and I stumbled across a build which looked really cool! I finished the building part then I downloaded the program file but I couldn’t import it. I have a MacBook with ...
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2answers
132 views

Port Splitter for EV3 motors

I have searched all over the internet for EV3 port splitters for motors. I have got 4 large motors and 2 medium motors and I do not have enough motor ports for them all. I can usually only find sensor ...
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14 views

Do you need multiple start blocks rather than just multiple wires from one start block?

Using the Chromebook app I cannot have multiple "wires" from the start block to multiple sections of code blocks. I have to use a start block for each section. When I try to drag a wire it only ...
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1answer
42 views

Unable to change program name in EV3 IDE

My students are having a weird problem in the EV3 IDE. When we try to change the program name, in the IDE, the name reverts to program. As an example, if the student is creating several programs, ...
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7answers
12k views

Direct control of EV3

I need to control a car with an EV3 brick. I want to control it remotely. The trouble is, I'm using an education set so I don't have the remote. What means of controlling it remotely could I use? I ...
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1answer
116 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 ...
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6k views

Compatibility EV3 software with NXT brick - known limits?

Lego says I can I use the new software to program old NXT bricks: Q: Is EV3 backwards compatible with NXT hardware? A: Yes. You can program your NXT intelligent brick using the new EV3 ...
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54 views

Is there a way to restart a program with EV3?

I've got a program with a code lock, and I would like the program to restart when you enter the incorrect code. Does anyone know of a way to do that?
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1answer
810 views

EV3-specific bricks missing from Lego Digital Designer 4.3.11 (Win)?

I have LDD on my Mac and have used it to create EV3 models (like an FLL robot, or a Lego dot-matrix printer). Recently, I purchased a cheap Windows laptop for use by a FLL team. After twice ...
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1answer
126 views

Run Code From PC

https://www.ev3dev.org/projects/2014/05/09/Python-Rubiks-Cube-Solver/ The other one gives a solution in around 20 steps, but takes around 500 MB of memory, so I need to run it on a computer How do I ...
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1answer
115 views

How to mirror an EV3 motor?

I want to get one EV3 large motor to copy the other. So if I move one half a rotation the other copies.
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2answers
562 views

Is EV3 Device Manager still active?

Link to https://ev3manager.education.lego.com/ is broken - will this be fixed?
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1answer
124 views

What does this error symbol on the EV3 mean?

I get this error image pop up when I power on my EV3. What does it mean? Also, is there a list of different error codes anywhere, I looked in the User Manual and I could not see anything. Cheers!
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1answer
75 views

How to distinguish between objects using a sonic sensor?

I am trying to find a ball in the field, grab it, and drop in the specified area. I'm using an ultrasonic sensor on the front of the robot. My current solution for locating the ball is: Turn ...
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1answer
163 views

Why is the EV3 Ultrasonic Sensor (45504) out of stock?

The EV3 Ultrasonic Sensor (45504) has been out of stock for a long time. Is the sensor discontinued due to an accuracy problem? Is there an alternate version of "Gyro Boy" that works without the ...
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4answers
10k 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 ...
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2answers
305 views

The center “ok” button does not work

My son has Lego Mindstorms EV3. The brick turns on when he pushes the center ok button, but he can't use it in the menu. What's the problem?
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36 views

T-R3X the look My Block problems [duplicate]

OK I am making the look My block for the T-R3X program but there is this block which don't know how to make at the end of the diagram in the book.
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9k views

Export Lego Mindstorms 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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17 views

changing ev3p file back into an ev3 project file

how do I change an ev3p file into an ev3 project file. Everytime that I click on the ev3p file to open it, it turns up as text in notepad.
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1answer
250 views

How can body segments be moved to precise angles in snake robot?

I want to create an EV3 robot similar to this: I've glanced at the mentioned papers. To me it seems that some simpler equations to govern the motors will work also. I have 9 segments, articulated by ...
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2answers
16k views

Code for PID for EV3-g

I want to use PID for my Ev3. I used PID for NXT-G before, but I have never used EV3-G before and don't know how to get PID. Could someone please post a screen shot of the code or upload the file?
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2answers
394 views

Is the NXT forward compatible with EV3 sensors and motors?

Is it possible to use EV3 sensors and motors with the NXT intelligent brick? I've read that the EV3 is backward compatible with NXT motors and sensors, but does vice versa work as well? Is the NXT ...
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49 views

The HiTechnic Color sensor is not detected in the port view in lab view

When I inserted the HiTechnic Color Sensor Block into the Ev3, the Ev3 detected the color sensor. But in my Mindstorms lab view, the HiTechnic color sensor does not appear on the port control. Can ...
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1answer
93 views

Stuck on “Installing rootfs” when installing leJOS on the brick

When following the instructions for creating an SD card with leJOS, the brick freezes when it comes to the screen “Installing rootfs.” I'm using a new 32 GB SanDisk SD card. I've confirmed that I'm ...
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1answer
151 views

How to make of point coordinate system for EV3

I'm trying to make a internal coordinate system for an EV3 Python project I'm doing, but at a complete loss on how to do it. It needs to keep track of how it moves (with wheels) in an X, Y coordinate ...
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5answers
9k views

Is it possible to edit a my block input parameter value?

I have created my blocks but want to change the input parameter to a negative. Is this possible or must all the myblocks be re-written?
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2answers
116 views

What does this symbol on the EV3 Brick mean?

I can’t figure out how to get my R3PTAR to open and close it’s mouth to bite. I keep getting this symbol. What does it mean?
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43 views

EV3 Brick is Stuck on Red

The EV3 brick started by flashing red. Then started where it is stuck on two red buttons. Have changed batteries, and manual reset with no change.
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1answer
47 views

Looking for custom EV3 block to control LEDs independently

The EV3 brick has 2 LED sets, one on the left side of the button panel and one on the right. Software such as python for ev3dev let's you control them both individually, the normal EV3-G LED block ...
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46 views

Using switch block with Hitechnic color block

Can I compare the Hitechnic block --> measure --> color output in a switch block? For example, if the Hitechnic color sensor is seeing black, then do something, else do another thing. If not, then how ...