Questions tagged [ev3]

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

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119 views

How to use the direct command to make EV3 motor backward?

I write the java language. I use ev3 direct command make ev3 motor to run, example: "opOUTPUT_POWER,LC0(0),LC0(0x01),LC0(20), opOUTPUT_START,LC0(0),LC0(0x01)" In this case, the power is 20 so I ...
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2answers
581 views

Is possible to change firmware of ev3 brick?

I bought LEGO 31313 but I would like to change the firmware for education (45544). 1.09H to 1.09E. Is this possible?
3
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1answer
770 views

What is a better algorithm for wall following with an ultrasonic sensor?

This wall following algorithm uses the ultrasonic sensor. It has a horrible worst case behavior. Place the robot about 3 cm too far from the wall. Instead of moving closer to the wall, the robot ...
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0answers
269 views

LEGO Mindstorms Spik3r won't move

I built my Spik3r as usual, but it wouldn't run when I tried to program it. I checked the wheels and the legs and everything seemed fine. I even looked back in the instructions, and redid it. It still ...
5
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1answer
1k views

How to pause, and restart (without resetting), a timer block - ev3

We're trying to pause the timer block, and then have it restart at the same time where it left off. By using the touch sensor in a loop before our timer code we were able to get the text output to ...
4
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1answer
278 views

LEGO MINDSTORMS EV3 Can't find MyData Block

While going through the challenges of the Gyro Sensor Investigation I came upon the issue that I do not have the MyData Block (It's a dark blue block with a graph on it) on the coding program. Could ...
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0answers
396 views

EV3 Home edition for Mac missing import block option

I'm running EV3 HE 1.3.1 on macOS Sierra 10.12.6, and I'm unable to import the ultrasonic sensor. When I open tools -> import block -> browse, the open button is always disabled, it does not allow me ...
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0answers
508 views

Why can't I install the NXT software on macOS High Sierra?

I just got an Mindstorms EV3 for Christmas, and learned that you can have the NXT communicate with the EV3 in the NXT software. I tried to install the NXT software on my Mac, but all that happens is a ...
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3answers
729 views

Why won't the loop block in my EV3 program stop?

I am building a robotic hand, and I programmed the finger to close when the touch sensor is pressed, and release when the touch sensor is released. It did that with a loop block - but when I ran ...
4
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1answer
596 views

What is the LEGO EV3 rpf file?

I read the LEGO Mindstorms EV3 Communication Developer Kit's document. I have a question in 4.2.1 (Start program “Demo” on EV3 brick) it is mentioned "The file-extension is "rpf" and NOT "rbf", so ...
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1answer
220 views

Colored balls detectable by EV3 color sensor

I'm looking for large balls in standard Lego colors that are detectable by the EV3 color scanner. So black, white, green, brown, yellow and blue and between 5 and 10 cm. I'm aware of the Duplo balls:...
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2answers
322 views

How can I program a motor to rotate towards the source of sound?

I have 3 sound sensors and a motor connected to four ports of the same brick. My motor should rotate by some angle towards the highest sound detected by the sensor, and now I'm wondering how I'm ...
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2answers
844 views

What does taking Raw value for EV3 Colour sensor do?

I participate in Robotics competitions like the WRO and I want to know if using EV3 colour sensor raw values helps in line follow.
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2answers
2k views

“Unable to compile” error code with LEGO EV3 Arm Robot Program

Does anyone know how to fix this error with my LEGO EV3 program? Unable to compile some documents for deployment: Program.ev3p: Use of a block which no longer exists. INI.ev3p: A My Block cannot ...
4
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1answer
1k views

How to make Lego Mindstorms EV3 robot go in reverse when move steering input comes from proximity sensor

I saw an program on the Lego Education page which makes a Lego Mindstorms EV3 robot gradually slow down as it approaches a wall. The info from the proximity sensor is used as the direct wire input of ...
4
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1answer
86 views

Why do two EV3 bricks have different power outputs?

I have two identical box designs with EV3 bricks. When I upload the same programs to both, one moves about twice as fast as the other. Is there a reason that this might be happening? Is there ...
3
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1answer
3k 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 ...
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3answers
8k 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 ...
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1answer
1k views

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 ...
5
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1answer
103 views

Two Mindstorms touch sensors: how to determine which sensor was pressed?

I'm trying do make simple program. Two motors, two touch sensors. Sensor one increases speed, sensor two decreases. The whole program works very well but only with one sensor. When I put some logic ...
2
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0answers
357 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
1k views

LEGO Mindstorms EV3: Camera recommendation for line 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 ...
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1answer
982 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 ...
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1answer
74 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
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1answer
619 views

LEGO EV3 on Chromebooks not recognizing NXT bricks

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 ...
4
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1answer
354 views

Spik3r wheels move but the spik3r itself doesn't

Our Spik3r's wheels move but the Spik3r itself does not move. Please see the picture of the back of the vehicle - is it somehow incorrectly built?
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2answers
684 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 ...
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1answer
322 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 ...
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1answer
590 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
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2answers
414 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 ...
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0answers
362 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 ...
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1answer
282 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 ...
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2answers
8k 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
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1answer
1k 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 ...
3
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1answer
325 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
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2answers
257 views

Programming to get data from EV3 sensor and send it to a server?

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
49 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
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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 ...
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1answer
143 views

EV3 T-Rex 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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2answers
2k 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 ...
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0answers
596 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
870 views

A 90 degree turn with Wheel part number 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/...
1
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1answer
674 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
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1answer
292 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.)
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1answer
343 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 ...
2
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2answers
4k views

How can I create custom EV3 blocks (developer mode)?

What do I need to create custom blocks and in particular the VIX part?
2
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1answer
482 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
2k 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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