Questions tagged [ev3]
EV3 is the current generation of LEGO MINDSTORMS, released in 2013.
355
questions
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Can't create block: “Use of a block which no longer exists”
Unable to compile some documents for deployment:
Program.ev3p: Use of a block which no longer exists.
PutInRange.ev3p
The block i want to make. It will put a input value inside a given range.
When i ...
2
votes
0answers
332 views
Is there an leJOS simulator for EV3?
I found this but this seems to be using their own library to control the EV3.
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0answers
862 views
LEGO Mindstorms EV3: Camera recommendation for lane tracking
I am planning to build an autonomous car in LEGO Mindstorms that will use ultrasonic or infrared sensors for collision avoidance and in the future also a camera for line tracking. I am now wondering ...
9
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1answer
724 views
Lego Mindstorms EV3: programming language recommendation
I am planning to build an autonomous car in LEGO Mindstorms that will use ultrasonic or infrared sensors and in the future also a camera for line tracking. Currently I construct my programs using the ...
0
votes
1answer
59 views
Mindstorms program - myblocks that work fine when run individually but when executed as part of a larger program, break
We have a line following myblock, which follows the line perfectly if it runs alone. However, if we include it as a block as part of a larger program, it goes haywire when it gets to that step and ...
3
votes
1answer
471 views
LEGO EV3 on Chromebooks
I teach two LEGO robotics classes in middle school and in one of my classes I am using EV3 and in the other NXT. I was able to have these classes because of the Chromebook app, but the problem I am ...
2
votes
2answers
401 views
EV3 isn't showing up in programming software after pairing on Windows XP
Running Windows XP x32.
I've connected, paired, connected, paired, paired, and connected, but I just can't get the EV3 software to recognize my EV3!
I've used this EV3 before on a different PC over ...
1
vote
1answer
229 views
Why does my EV3 not have data logging in Brick App menu?
I recently purchased a 45544 Educator Mindstorms product. In working through tutorials. I am at section on data logging, but my Brick Apps menu stops at Brick Program. Data Logging is not on menu
My ...
0
votes
1answer
547 views
Does the Lego Mindstorms EV3 software work on macOS High Sierra?
Will there be issues with the software, or will it work properly on macOS High Sierra?
My Mac: Retina MacBook Pro 13", Early 2015
3
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2answers
337 views
How To Plug Detected Light Values into Variables and Still be Usable in Programs in EV3-G
I've seen teams, mostly in the world festival do this, and what they do is they program the robot so that when a brick button is pressed, the robot detects a value (usually RLI) and it is used later ...
1
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0answers
304 views
ev3 brick blocked during running a program
I pressed "Run my program" (a simple one), and it is stuck with "mindstorms sound_turn_on" displayed on the screen. The name of my program is sound_turn_on. I am using LabView to program it. Now ...
2
votes
1answer
210 views
EV3 motor control proportional to another motor when more than two motors
From what I understand, in EV3-g you can use "move steering" or "move tank" blocks to regulate two motors proportionally to each other as they have a built-in PID controller to do that.
If one motor ...
5
votes
2answers
6k views
Is the LEGO BOOST kit compatible with EV3 or PowerFunctions motors and sensors?
I'm curious if I can use my existing EV3 and/or PowerFunctions motors to extend the functionality of my LEGO BOOST set. Is this possible?
2
votes
1answer
745 views
LEGO EV3 I2C Compatibility
I'm having difficulties with communication between the EV3 and Arduino boards. Does anyone know if the EV3 is really I2C compatible, or is it just close enough?
Background: I can get the EV3 to ...
2
votes
1answer
269 views
EV3 switch block does not recognize text?
i am using file access to input variables into my programm.
text file is something like this:
a
b
c
..
on each loop, program access file (using File Access block) and reads a new line "a" or "b" or "...
0
votes
2answers
159 views
Programming to get data
I am using EV3 with Linux V1.09 and I am doing a project in which I want to send the sensor data from the EV3 to a remote web server using POST method - is this possible?
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0answers
33 views
Is my EV3 controller bricked? [duplicate]
My EV3 controller seems to be 'stuck' in this state:
Is the device operating properly?
If not, is there a procedure that can unbrick the controller?
Thank you
4
votes
1answer
2k views
Is it possible to fix a broken EV3 Port?
I have an EV3 running RobotC version 4.55.
The medium motor connected to Port A does not run, but if I connect it to another port (B,C,or D) it works. I tested it manually through the EV3 motor tab ...
1
vote
1answer
102 views
Trex we build keeps toppling over on step
I'm building the standard T-rex
project from Benedettelli's book.
We double checked construction and also step my block - all looks correct.
Any pointers appreciated.
4
votes
2answers
1k views
How to connect two LEGO Bricks EV3 by USB using python
For some project, I have to use 7 motors with ev3 bricks.
So I would like to connect 2 bricks using USB-USB link, and make them communicate, in python.
But I don't know how to do that, I've tried ...
1
vote
0answers
520 views
EV3 connection problem via USB on Windows 8.1
I am using LEGO EV3 on windows 8.1 eclipse Neon. When I try to launch the class as a LeJos application I get this error.
IP address is /10.0.1.1
Creating the jar file or uploading the program failed
...
1
vote
1answer
823 views
A 90 degree turn with 56145
I'm making a program for my ev3rstorm and I want it to have a 90-degree spin turn. I use the standard part ev3rstorm wheelbase or rather, treadbase. Using the move tank block (I use that block all the ...
4
votes
1answer
2k views
How to get double the speed from 2 regulated EV3 motors?
So I've noticed that if I connect two EV3 motors to one another (with gears), I still get exactly the same maximum speed as if I had a single motor.
So, my question: how can I get twice the power/...
1
vote
1answer
587 views
How can I build a compact EV3 gearbox?
I'm building a sumo bot in EV3 and would like to have both 1:1 and 1:3 gear ratios, with the first being useful for general driving and the second more for pushing other robots.
My problem is, I ...
11
votes
1answer
265 views
Are there any benefits to using PF motors instead of EV3 ones?
Can someone explain to me the key differences between PF motors and EV3 ones? I understand that EV3 motors are 'regulated', presumably meaning that you can control their rotational speed depending on ...
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5answers
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.)
1
vote
1answer
312 views
LEGO mindstorm EV3 control using FPGA
I need advice on this issue. I want to build a communication between EV3 Mindstorms and FPGA. I want to control the different actuator/sensor of the EV3.
The idea is to test functionality of my ...
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vote
2answers
2k views
How can I create custom EV3 blocks?
What do I need to create custom blocks and in particular the VIX part?
2
votes
1answer
401 views
EV3 Wired Brick to Brick communication
I'm currently working on a project for my intro to engineering class.
As it stands now, one brick is running a LabView program to intake data from a 'barcode' and another brick runs a Matlab program ...
3
votes
1answer
1k views
How do you open a logfile (.rdf) downloaded from an EV3 brick?
I have been logging data for a few sensors, and would like to import that data into Excel. What exactly do I need to do? I remember reading somewhere that LabView can export logging data (I have the ...
4
votes
1answer
104 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 ...
0
votes
1answer
108 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 ?
0
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1answer
119 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 ...
0
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1answer
212 views
Ev3 won't run 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
votes
1answer
1k 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
votes
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
1k 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 ...
6
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5answers
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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
votes
1answer
233 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
votes
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 ...
5
votes
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)?
...
4
votes
1answer
9k 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.
4
votes
2answers
972 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 ...
3
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1answer
147 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?
2
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0answers
666 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
votes
1answer
161 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
434 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
votes
1answer
380 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?
6
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1answer
3k 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
votes
1answer
65 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 ...
