Questions tagged [ev3]

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

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1answer
108 views

Any way to track a light source in 1 dimension using one color sensor?

I would like to know if there is any workable way to use a single color sensor to track a light source in one axis of rotation? Would rotating the sensor back and forth within a few degrees, every ...
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1answer
138 views

Bazooka blast ev3 Mindstorms using Python

I would like to shoot balls with the ev3 Lego robot. How can I code it using Python? Which components do I need for that and which function and motor use ?
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1answer
134 views

System.ArgumentException: Only Sequence Wires can be snapped

I try to open an project on last version of LEGO Mindstorm EV3 Home Edition, but the system shows the next error message 'An unexcpected error has ocurred. Please restart LEGO MINDSTORM EV3.' After ...
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1answer
272 views

EV3 won't run a certain loop

I'm trying to make a program where an EV3 is IR controlled but if button 9 (toggle) is pressed it goes in autonomous mode. However, my EV3 will not run a certain loop in the program. It looks like ...
2
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1answer
2k views

EV3 not recognized by PC when attempting firmware update after interrupted update

I have just sent the following inquiry to Lego Customer Support: I aborted a firmware update and now the Intelligent Brick does not get past the "Starting.." message when it is turned on. I ...
2
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1answer
2k views

What is the best option for Mindstorms EV3 remote control for motors?

I have never experimented with remote controlling EV3 but I wonder what is the best way to use it, especially in the case when I'd like to control large and medium motors parallel as well, possibly ...
0
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1answer
2k views

Moving the motor to certain initial position [duplicate]

I was assisting my child in EV3 missions, specifically, the 3rd mission of TRACK3R, the one where the robot has to grab two tires and put them elsewhere. The mission requires to manipulate the Medium ...
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 ...
4
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1answer
302 views

Is code written for NXT bricks compatible with EV3 brick (for Johnny 5 building)?

My son is mad on the robot from Short Circuit (Johnny 5) and I want to build robots with him. We have a copy of Daniele Benedettelli's "Creating Cool Mindstorms NXT Robots" and I was planning to start ...
8
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1answer
270 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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1answer
2k views

What is the best way to program Mindstorms EV3?

I'm just starting to use the LEGO Mindstorms EVE robot and I'm a bit hesitant which way to choose for programming: the official graphic software or any alternative (preferably the Linux based ev3dev)? ...
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2answers
12k views

EV3 Ultrasonic Sensor block is not availible in the Home Edition software

I can't find the ultrasonic sensor block on the programming app on my computer. I am using the Lego Mindstorms EV3 Home Edition.
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2answers
1k views

Send variable to EV3 via WiFi

I'm trying to connect my EV3 via Wifi to my Unity game. Is there a simple way to send a command to the EV3? I gave the EV3 a fixed IP and I'm getting the broadcast which the device is sending. So ...
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1answer
163 views

Are there any sensors that are capable of measuring audio pitch for EV3?

Are there any sensors that are capable of measuring audio pitch? Or is there an easy solution that a beginner would be able to make work?
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0answers
893 views

Programming NXT ultrasonic sensor with EV3 software [closed]

How can I program the NXT ultrasonic sensor with EV3 software? When I pick the block for the ultrasonic sensor, it tells me it is not compatible.
0
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1answer
392 views

Does anyone here know how to apply for MFi product plan id to LEGO?

Does anyone here have an idea as to how to apply to LEGO to get MFi product plan id? Or how do I get to their MFi product plan form?
4
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2answers
585 views

Mindstorms EV3: Patrolling a number of rooms - what are my options?

I want my Mindstorms EV3 bot to patrol a number of rooms autonomously on the same track. What are my options? line following, which requires a line and is relatively slow setting a default program ...
2
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1answer
424 views

List of parts to buy for to “upgrade” existing Mindstorms NXT 1.0 to Mindstorms EV3 set?

Is there a list of parts available I need to buy to "upgrade" an existing Mindstorms NXT 1.0 (8527) set to a Mindstorms EV3 set?
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2answers
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EV3 Motors not moving even though EV3 has batteries

I am new to using the EV3. I have only had it for 3 weeks. My question is why are my EV3 motors not moving? I know the motors are new and they are in such a good condition they could be sent back ...
6
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1answer
5k views

How do I export LEGO Mindstorms programs on the Chromebook

There is now a Chromebook app to program LEGO Mindstorms. I have multiple kids collaborating on programs for FIRST LEGO League. Can they share the program between their Chromebooks? I don't see a ...
2
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1answer
74 views

Can I get a JSON value from the internet without flashing a custom FW on EV3?

Got an EV3 for X-Mas. My old NXT brick was broken. So now I have a ton of motors and sensors and all. First project I'd like to create a Bitcoin piggy bank which performs some actions when it gets new ...
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0answers
1k views

Bluetooth connection to EV3 from Java on Linux/Android

I would like to connect to my EV3 from PC (and then Android) via Bluetooth. I was able to connect to NXT with LEGO-MINDSTORMS-MINDdroid which uses direct LCP commands but as far as I know the ...
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1answer
183 views

Do we need WiFi Dongle to install Scratch on EV3

I was wondering if I can install Scratch program on EV3 brick without the wifi dongle. Appreciate any insight here.
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1answer
651 views

Installed EV3 software on Win 8 and it won't load

EV3 software used to work on my laptop. Now it does not load any more. When I double click on the LEGO Mindstorms icon. It starts the procedure of loading the software. Then it stuck there and won'...
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 ...
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2answers
204 views

A wired data logging brick

I need a data logging brick where I can wire an input to the file name. Is this possible? and if so how would I do this?
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1answer
387 views

EV3, menu with the buttons?

I've been trying to make a menu that when you press the < button on the block it will start and > button to stop. The menu will also only occur at the start, it will not be ongoing. I've ...
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1answer
3k views

How do I rename an EV3 project?

I can rename the program in the Home Edition software but I just can't rename a project. Please tell me how to do it. Thanks!
2
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1answer
837 views

Raw sensor question?

What is raw sensor and what is on port 3? Is this code only for robot to go completely straight without errors?
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1answer
2k views

Use legacy RCX sensors with EV3

In NXT-G, there was a "Legacy" Block pack which had blocks to allow for the use of RCX motors/sensors with the NXT, as long as you had a converter cable. However, the EV3 software does not have this, ...
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3answers
2k views

Does the Mindstorms EV3 software work on macOS Sierra?

I guess this is a continuation of these two questions: Does the Mindstorms EV3 software run on OS X El Capitan? Is the LEGO Midstorms EV3 software compatible with OS X yosemite? macOS Sierra was ...
2
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1answer
601 views

Color sensor use in Commander app

I'm trying to build the MindCub3r model shared online at http://mindcuber.com. It often has trouble scanning the cube so I wanted to check the output of the colour scanner by using the Commander app. ...
0
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1answer
154 views

EV3 program refuses to work

I downloaded a 67KB program into my EV3 block. However, the program refuses to work. The EV3 says "Main", the name of my program, but it does not respond otherwise. What is the problem, and how do I ...
4
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0answers
793 views

Ev3 spik3r mission 2 doesn't move

So I was building Spik3r and I thought I got mission 2 completed. Wheels are turning, legs are moving but the robot just does not move. It looks like the small wheels should be moving the robot but ...
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3answers
3k views

PC control Ev3 robot

I wanted to see if I could control my robot with a PC and I wanted to know if there was a way to do it. I have already searched for a controller for the PC and didn't find anything.
6
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1answer
295 views

How can I make an EV3 vehicle follow an elliptic equation?

Has anyone succeeded in having the EV3 driving base moving following an ellipse? I would like the kids to think about how would we program a satellite orbiting around earth. They would input the ...
7
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1answer
4k views

How can an EV3 motor “remember” it's starting position?

I am currently working on a project that uses large motors. I want the project to return to a "starting position" (0,0,0) at the touch of a button so that it can be used multiple (identical) times. ...
7
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1answer
8k views

How do you program mindstorms to keep doing a task until either the IR OR the colour sensor state changes

How do you program mindstorms to keep doing a task until either the IR OR the colour sensor state changes. I would like to use the wait block but it can only be either the colour sensor or the IF ...
4
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1answer
397 views

What files are required to run an ev3 program?

I'm working on a project that aims to help beginning Lego Mindstorms programmers. I'm developing certain "modules" (moving straight, making a turn) for students to try, and I want to develop a program ...
7
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1answer
957 views

Understanding the makeup of an XML .ev3p file

When you unzip an .ev3 program, there are many txt and xml files that are inside. In particular, there is an xml file produced with the filename extension .ev3p, which seems to contain program ...
2
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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. ...
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0answers
72 views

How do you get LEGO Education EV3 Software? [duplicate]

Does anyone know how to get it? I have a rough feeling that you get it by purchasing the product? Please help.
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1answer
2k views

Where can I find a good tutorial on programming with Lejos?

I want to get started with LeJOS and use Java to check to see if an EV3 touch sensor is pressed, but I can't find any decent tutorials. Are there any good resources for this?
3
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0answers
814 views

Sending Gcode to LEGO mindstorms x/y plotter?

I am building an x/y plotter out of LEGO Mindstorms. I would like it to read an SVG file on the EV3 brick, convert it to gcode, and draw the coordinates. How would I go about doing this?
7
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3answers
8k views

EV3 screen stuck at “Starting…”

After I turn the device on, its screen is stuck at "starting..." for a long time. It hasn't change into the regular screen, and the light behind the button was still red (didn't become green). Is ...
2
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2answers
4k views

Is it possible to access the RGB values of the EV3 Light Sensor?

I'm following a line with the LEGO EV3 Color Sensor in Reflected-light mode, I need to stop the robot when it detects a green tile in the ground, but I didn't succeeded in differentiating Green and ...
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1answer
1k views

How to parameter the ports in move tank block EV3?

How do I parameter the ports at Move Tank block (in My Block)?
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1answer
402 views

EV3 Installation failure on OSX El Capitan 10.11.3

Hi This is the first time I've tried to use EV3 software since upgrading to El Capitan. Before then, it worked perfectly. When I tried to launch the application a message pops up saying it has ...
3
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1answer
828 views

LEGO Color Sensor - EV3

My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?
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1answer
125 views

Why does display output affects motors?

I'm making a simple program with LEGO EV3 Education. It makes a little tank to follow a black line over a white-ish floor. Here it is: [] This works very smooth: it makes the tank follow the EDGE ...

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