Questions tagged [ev3]

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

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1answer
7k views

Naming a program in EV3 software?

I have figured out how name a project but cannot figure out how to rename a program.
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0answers
481 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 ...
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1answer
93 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.
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1answer
802 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 ...
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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/...
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1answer
252 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 ...
2
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1answer
3k views

Is it possible to connect EV3 and NXT bricks like master/slave configuration via bluetooth?

Can I make a Bluetooth connection between LEGO EV3 bricks and LEGO NXT bricks? and If it is possible how to handle the software to make a chain between them?
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4answers
2k views

Every time Robot is launched (without changing the code) it is not following the exact path

I'm working on FLL mission and every time our team launches the robot (without changing the program, and we are making sure that it is starting from same location every time) it is not following the ...
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2answers
1k views

How can I attach a Technic Linear Actuator to a EV3 Medium Motor?

I'm pretty new to serious LEGO building (never got past very blocky houses as a kid but got into Technic a couple of months ago) and need to connect a Technic large linear actuator (61927) to a ...
2
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1answer
373 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
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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 ...
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3answers
2k views

My Blocks with return parameter

I have the retail EV3 kit and have created a function with in and out numeric parameters. While using the [in] params seem quite straight forward, it seems that I can only set the [out] param once. ...
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1answer
3k views

Pass sensor or motor port number as a parameter

I want to create a block for one light sensor or one motor separately. Is it possible to give the number of the port as a parameter to a sensor or motor block via data wire? In NXT-G it was possible.
4
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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 ...
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 ...
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1answer
103 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 ?
3
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1answer
380 views

Mindstorms EV3 3D building instructions no longer working in Chrome

Lego Mindstorms EV3 building instructions in 3D (so that one can rotate the model around and stuff) are available. This used to work fine on my machine in Google Chrome. However, I can no longer get ...
6
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1answer
476 views

Which move block to use with Gyro?

We would like to make a series Gyro drive blocks. As a general rule what would be the benefits and drawbacks from using the move tank and move steer blocks? My basic design is to read the gyro and ...
5
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4answers
4k views

In lego mindstorm EV3, can you make the individual programs in a project into functions which can be used in the other programs?

The bit where you program what the robot does using your computer. I'm making a project and I can't fit it all onto the screen, so if you can't do functions, is there any way to zoom out of the screen ...
0
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1answer
190 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 ...
0
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1answer
116 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 ...
3
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4answers
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 ...
5
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1answer
805 views

How can I use the EV3 educational firmware instead of the retail version?

I have an EV3 brick from the retail kit, which is currently running the retail firmware. I would like to replace the EV3's firmware with the educational version. How can I do this?
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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 ...
3
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1answer
547 views

Infrared sensor behavior

I'm developing a small program with the LEGO's Ev3 development tool. I'm trying to make the robot rotate, 30° at time, and if the infrared sensor detects something then make something and stop. Here ...
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2answers
580 views

Making an ATM with an EV3

I am building an ATM using my LEGO Mindstorms EV3, but I ran across a problem. The problem is that I want to be able to input the amount of money that I want to get out of the ATM but I can only have ...
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 ...
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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 ...
5
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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)? ...
4
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2answers
792 views

Issues connecting the EV3 on Windows 8.1 64bit [closed]

I have got a computer with Windows 8.1 64 bit and I have installed LEGO Mindstorms EV3 software Home edition and tried to connect the EV3 brick to the computer, but the brick didn´t connect to the ...
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3answers
2k 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.
3
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1answer
7k 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
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2answers
911 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 ...
0
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1answer
151 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?
3
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1answer
142 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?
4
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2answers
389 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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0answers
565 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
113 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 ...
2
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1answer
4k 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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1answer
448 views

How to receive response from direct_command_reply from EV3 using Python?

I've established and tested a Bluetooth connection (by playing a tone) between EV3 and Mac running Yosemite with Python 2.7.11. I used file write as in bt.write(tone) in Python to play the tone ...
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0answers
140 views

Unable to turn on the EV3

I just can not turn on the EV3 with the SD card. I only turned on it twice. The EV3 stops at [-leJOS EV3] UI and does not go to the next step. I charged the battery, reinstalled the software inside ...
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0answers
358 views

How to determine orientation of a EV3 gripper?

I have built the EV3 Gripper using the manual. I am programming an ev3 brick using ev3dev. I need to determine the angle/direction/orientation of the robot programmatically, before I can issue a ...
2
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1answer
64 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 ...
2
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1answer
266 views

EV3 Programme won't load to brick

I have installed EV3 on my PC and am trying to load a program into an NXT 1 Brick. When I click the down load button on the EV3 screen the Brick beeps twice and the program does not load. What am I ...
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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
5k views

Programming EV3 with NXC

I'm trying to run NXC programs (all run well on NXT) but when trying run it on EV3 I find an error. The download from computer to EV3, runs well but trying to run the program with RUN EV3, I have an ...
3
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2answers
351 views

Can a EV3 program run simultaneously with the Running Robot commander app?

Is it possible to run the Robot Commander app and a program on the EV3 brick at the same time? If so how would it be accomplished?
3
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2answers
449 views

Mindstorms, black orphaned data wires

I've just copied a loop element, which had a data wire going into it. The internal wires (from the old external data wire) are now black, and I cannot delete them, or re-link them to a new external ...
4
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1answer
341 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 ...
2
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1answer
705 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 information ...