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Questions tagged [ev3]

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

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2answers
811 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 ...
4
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2answers
382 views

Lego EV3 - Get output device type, opOUTPUT_GET_TYPE

I would like to know what kind of motor (XL, L) is connected to EV3 output port (A|B|C|D). I need to use direct command: Instruction opOutput_Get_Type (LAYER, NO, *TYPE) Opcode ...
4
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1answer
1k views

Is the LEGO Mindstorms EV3 brick waterproof?

I am trying to build a ROV (Remotely operated underwater vehicle) with LEGO Mindstorms Ev3. Is it waterproof?
4
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1answer
304 views

How can i use my iPhone to scan a barcode and send it to my EV3 brick?

I'm trying to build a sorter that scans the barcode on the brick using an iPhone and sorts it accordingly to the barcode. I cannot use colours due to amount of things to sort.
4
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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 ...
4
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1answer
231 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 ...
4
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2answers
940 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 ...
4
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1answer
352 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 ...
4
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1answer
108 views

System files deleted somehow

I think my son accidentally deleted all the system sound/image files, etc. I have tried loading the firmware but that does NOT restore the files. Is there not a way to just upload the system sound and ...
4
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1answer
1k views

Use iPhone camera as an input sensor for EV3

As EV3 has Bluetooth builtin as well as iPhone too, is there a way to connect them somehow so that iPhone could send data from the camera via Bluetooth to an EV3 brick? As a more general question, ...
4
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2answers
568 views

How can I find the analog output of a color sensor?

Could anyone provide me with an image of the voltage output of an NXT or EV3 colorsensor. I would like to have the analog output if it's possible, and not the digital output.
4
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1answer
67 views

DNX on LEGO Mindstorms

I am not familiar with ARM development but I am wondering would it be possible to compile DNX against LEGO Mindstorms EV3 processor. I know there is some ARM support and even there are some builds ...
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0answers
622 views

Daisy chaining EV3 with RobotC

I'm trying to run EV3 programs with RobotC and trying run on EV3 Daisy Chaining. I have three independent EV3 bricks labelled A,B,C. I want, according to the color reading by the color sensor on ...
3
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2answers
10k views

Where can I find LEGO Digital Designer projects for Lego Technic MOCs?

I have LEGO Technic pieces collected from multiple sets and would like to find projects on the web which I can view and build models step by step. Please advise sources where I can find these.
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3answers
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Are NXT Light sensors compatible with EV3?

I would like to use the NXT light sensors my EV3 brick. I don't have enough light sensors as I need 2 for each robot (per set) and it only comes with one. However, I have a lot of NXT sensors. Will ...
3
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3answers
9k views

How can I use multiple switch options in Lego Mindstorms EV3 software?

What I see is just a simple if/then/else. What I am looking for is to be able to add multiple options, more than yes/no. I use a motor as a switcher, so I rotate it to some position and measure its ...
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3answers
1k views

Creating a native EV3B block

I'm trying to create a native block for a hardware sensor. I've got it working pretty well, but can't get it to show up in the "port view" as anything but a sound sensor. I really need the live view ...
3
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1answer
80 views

Anyone have the control block for the hitechnic color sensors?

I'm just wondering if anyone has a copy of the control block for the hitechnic color sensor v2? I'll take a v1 if you have that because I'm desperate at this point. The downloads page for it is down ...
3
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1answer
983 views

EV3 motor TACHO signal connection. Hardware schematic questions

I'm trying to understand EV3 motor TACHO signals circuit on the EV3 hardware schematic. Please look at the image below. There are two things I can't understand: On the left side, the TACHOA0 input ...
3
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2answers
358 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
824 views

Should I buy the retail or education version of Mindstroms EV3?

There are other questions that list the differences in the retail and educational version but I cannot judge which one I should buy (educational or retail). I am buying Mindstorms for the first time, ...
3
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1answer
52 views

How do I delete custom images I made in my computer?

I created a custom image for a test, and everytime I download the program to my brick, the image shows up in the folder despite me not using a display program. How do I fix this?
3
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2answers
2k views

How to instruct Mindstorms EV3 from PC conditionally?

I want to direct my LEGO Mindstorms EV3 creature from my PC conditionally (ev3dev, Python). The idea is that the program runs on the computer, collects real-time data from different sources, processes ...
3
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2answers
315 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 ...
3
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1answer
621 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?
3
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1answer
636 views

How to read the EV3 display

Is there a users guide or something similar that describes in detail all the images that one sees on the display? There seems to be a lot of stuff there, but no explanation.
3
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1answer
1k views

NXT or EV3 gyro sensor

Do NXTs or EV3s have gyro sensors or built-in gyro sensors? How can I know the direction of the robot?
3
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2answers
458 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 ...
3
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2answers
820 views

Logging and performing mathmatical calc. during run?

Is it possible using the new EV3 to log data, and peform mathmatical calculation on the data while it's being logged, and peform some and thereby trigger some event if some value has been reached?? ...
3
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2answers
289 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?
3
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3answers
4k views

EV3 brick Bluetooth connection error

I’m unable to pair the ev3 brick to our iPad mini. Both see each other but I keep getting this error on the ipad, Connection Unsuccessful, make sure ev3 is turned on and in range. And the ev3 shows a ...
3
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2answers
194 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?
3
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1answer
155 views

How do I add the lms2012 library as a dependency within Visual Studio

I'm following this question and am curious how I go about actually importing the following the necessary dependencies. I see this line: #include "ev3sources/lms2012/c_com/source/c_com.h" and have ...
3
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1answer
382 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 ...
3
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1answer
2k views

What RGB-values do I get from the colorsensor

I have the extra colorsensorblock used by mindcuber - ColorSensorRGB - installed. Now I'm trying to use it in my own projct. But what values does it produce? It seems like it has a min-value of 0 (as ...
3
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2answers
4k views

Why I get this “message 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 ...
3
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4answers
2k views

IDE recommendations for EV3 programming

Does anybody have any recommendations for non-GUI programming of the EV3 unit? I'm impressed by the LabVIEW software, but as a professional C# and VB.Net programmer (with C, C++ experience), I find ...
3
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1answer
1k views

EV3 Block problems?

I don't see what is wrong with the way i made my program. It looks like this. The idea is that in the while loop [01] shall the robot move forward until it see something brown. If it see ...
3
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1answer
2k views

How do I have an else in conjunction with an if statement with two conditions?

I can't find a way to emulate an AND statement in a switch statement: if (angle >= 10 and angle <= 30) ;// do smth else ; // this is what I want Until now, I just nested two if ...
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 ...
3
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1answer
145 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?
3
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1answer
594 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 ...
3
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1answer
498 views

How to fix the Gyro

Currently the gyro sensor connected to the EV3 brick doesn't really work. whenever the gyro is attempted to be used the robot will just sit and spin once it gets to where it needs to use the gyro. Any ...
3
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1answer
240 views

How to measure green/blue reflected light on EV3?

As I know there is no way to turn on green/blue reflected light on EV3 color sensor. Is there a way to do it using NXT color sensor and EV3 controller? Or the only way is to use NXT controller ...
3
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1answer
1k views

Programming The Lego Mindstorms T-Rex from EV3 Laboratory

I bought the book The Lego Mindstorms EV3 Laboratory fron Daniele Benedettelli. I buid the T-Rex chapter 15 and when I tried to programming the T-Rex (chapter 16) I have a problem. I'm not able to ...
3
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1answer
3k views

Light on color sensor is blue

We had the sensor color on red and it was working with our remote. We changed the batteries in the 'brain' and now the light sensor is blue and won't work with the remote. Any suggestions? It's a ...
3
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1answer
2k views

Dimensions for EV3pieces

I need to know the dimensions of the EV3 pieces for a school project (in mm). Does anyone know?
3
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1answer
680 views

Can additional MyBlock icons be added to the EV3 palette of icons available in the MyBlock builder?

I'm a big believer in using MyBlocks when using EV3. For FLL teams, every robot needs to move forward, backward, turn right, turn left, arm up, arm down. Even before a robot is built, those MyBlocks ...
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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 ...
3
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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. ...