Questions tagged [ev3]

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

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Can EV3-G MyBlocks be recursive?

Imagine I create a MyBlock called function1 from a line of blocks. Can I call that block from within itself? This is the program for the block recursiveTest. Will this block function properly?
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EV3 additional build instructions - PDF download or print possible?

The EV3 retail edition comes with printed instructions to build only one of the possible robots and it appears you have to use the software to view the build instructions of the other models. My ...
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EV3 digital interface with sensors?

The EV3 Brick is noted as having both analog and a higher speed digital I/O with auto ID up to 460.8 Kbit/s (UART), and 4 motor port with encoders. The NXT Brick has 4 sensor ports both Analog and ...
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107 views

How can I have EV3 Commander App continue running the motor when I release the slider?

I'd like to control a drawing robot that I am building with EV3 Commander App. The problem is that EV3 Commander App stops the motor as soon as I release the slider. Is there an option with EV3 ...
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444 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 ...
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174 views

No power to Mindstorm EV3 Brain

My 11 year old just spent her entire Christmas Day assembling the Mindstorm EV3 Reptar, but when we put batteries in the brain nothing happened. It didn't turn on, no lights, no sign of power at all. ...
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216 views

Using the NBR 1036 Barometer with the EV3

I just purchased the HiTechnic Barometer from LEGO, thinking the Block was available for the EV3. Theory says that I can use NXT Block in the EV3. Can anyone point me in the right direction?
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1answer
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Trying to get a modified traffic signal challenge worked out

The challenge is for a robot to go around the perimeter of a rectangular field and execute 90 degree turns when it gets within 4.5 inches of a wall. Simultaneously, if the bot encounters a red flag, ...
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145 views

Teleoperated arm trouble

I have built a robotic arm with the lego Mindstorms ev3. My goal is to control its motion via teleoperation, that is , to have a gyro sensor strapped onto my arm and have the robot mimick the up and ...
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484 views

What are the memory requirements of EV3-G software blocks running on NXT bricks?

The NXT brick has about 130K memory available for user programs. With the newer firmware required for downloading EV3-G programs that memory has been reduced to 118K. How much memory is used by the ...
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EV3 Brick and Commander app bluetooth disconnecting

On OSX on an iPad, we're having an issue with the EV3 Brick and Commander app bluetooth connection constantly disconnecting. The brick just stops responding, so we turn the brick off to disconnect and ...
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659 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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459 views

No response when controlling the Mindstorms EV3 brick over Bluetooth

I am trying to control the EV3 using direct commands over a Bluetooth connection. There are no issues pairing the brick with a PC or phone, and opening the serial connection works fine, but sending a ...
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679 views

Can I use EV3 with a TETRIX motor?

What program can I use to control a TETRIX motor through the LEGO EV3? I've heard that RobotC currently cannot be used for this. Has NI released a Labview version which I can use to control TETRIX ...
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1answer
193 views

EV3 Rapt3r's head cable interfering with slithering

My Rapt3r is working great, except that the cable that goes from the head to the "Intelligent Brick" physically interferes with the slithering on the side on which it is plugged (port 4). Physically ...
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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 ...
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362 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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What is this EV3 controlling app

What is this EV3 controling app that is used here: https://youtu.be/Sjix76QjtMU?t=1m43s
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LEGO Mindstorms EV3 crashes on OS X El Capitan

I get the following problem details, can anyone help me? Process: MindstormsEV3 [595] Path: /Applications/LEGO MINDSTORMS EV3 Home Edition.app/Contents/MacOS/...
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Mindstorms crashes when connecting to EV3 with Bluetooth

I am using OS X 10.10 (Yosemite) on a 2011 MacBook Air, LEGO Mindstorms EV3 Home Edition v1.0 and the latest firmware on the EV3 (v1.06H) When I attempt to pair the EV3 with my Mac over Bluetooth, ...
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Is there a fix for an NXT reporting “File error!” when running an EV3 program?

I downloaded the new EV3 software from Lego and installed it on Windows 7. The EV3 software runs. I plugged in an NXT using a USB cable. EV3 can edit the memory on the NXT and remove programs/...
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95 views

Stepping through Mindstorm program

The code does not do what I think it should. It is frustrating to tweak it, download it, run it from the block, and find that once again, it does not do what I think it should. Is there some way to ...
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1answer
705 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 ...
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Code for PID for EV3-g

I want to use PID for my Ev3. I used PID for NXT-G before, but I have never used EV3-G before and don't know how to get PID. Could someone please post a screen shot of the code or upload the file?
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Turn a tank a specific number of degrees

I don't have a gyro sensor so that's not a possible solution (until I purchase one). I figured I'd just do the math on this one. What I'd really like to know are: The circumference of the caterpillar ...
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1answer
125 views

EV3-specific bricks missing from Lego Digital Designer 4.3.11 (Win)?

I have LDD on my Mac and have used it to create EV3 models (like an FLL robot, or a Lego dot-matrix printer). Recently, I purchased a cheap Windows laptop for use by a FLL team. After twice ...
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Stuck on “Installing rootfs” when installing leJOS on the brick

When following the instructions for creating an SD card with leJOS, the brick freezes when it comes to the screen “Installing rootfs.” I'm using a new 32 GB SanDisk SD card. I've confirmed that I'm ...
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1answer
45 views

Looking for custom EV3 block to control LEDs independently

The EV3 brick has 2 LED sets, one on the left side of the button panel and one on the right. Software such as python for ev3dev let's you control them both individually, the normal EV3-G LED block ...
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119 views

Seeking HiTechnic Color Sensor V2 control block for EV3-G

I'm looking for the EV3-G control block for the HiTechnic Color Sensor V2, previously distributed by HiTechnic (https://www.hitechnic.com/cgi-bin/commerce.cgi?key=NCO1038&preadd=action), ...
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157 views

Why is the EV3 Ultrasonic Sensor (45504) out of stock?

The EV3 Ultrasonic Sensor (45504) has been out of stock for a long time. Is the sensor discontinued due to an accuracy problem? Is there an alternate version of "Gyro Boy" that works without the ...
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3k views

Can you extract a program from the EV3 brick to the computer?

As part of an assignment, I made a program for my EV3, but however my computer automatically restarted, so I lost that program. I need to show the program! However, the program is still in my brick. ...
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387 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 ...
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1answer
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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 ...
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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
744 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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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
384 views

Direct/system command for reading the display buffer of EV3 bricks?

I recall being able to read in the display buffer of NXT 2.0 bricks over Bluetooth/USB by issuing Read IO Map system commands. I've looked through the bytecodes and communication documentation for the ...
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The Mindstorms EV3 Software crashes on OS X Yosemite 10.10.3. What do I do?

It's crashing on startup which is really irritating. When debugged with terminal it says this: Unhandled Exception: System.UnauthorizedAccessException: Access to the path is denied. [ERROR] FATAL ...
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1answer
65 views

Two motors are driven forward, why are they rotating in different directions?

I have the Lego Mindstorms EV3 Pack and built a simple car with 3 wheels. The back whels are motorized. When I run the following code: Motor.A.backward(); Motor.D.Backward(); both motors are ...
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3answers
156 views

EV3 Multiple conditions: wait sensor activation for N seconds or

How to program EV3 to wait for a sensor activation for at most X seconds? If the sensor is activated in the given time, begin sequence B. If it is not activated in X seconds, begin sequence A. ...
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2answers
129 views

Is the EV3 compatible with a 3rd party I2C gyroscope?

The only detail I've found so far is that the pull-up resistor should be 82k ohm. I'm wondering If I could just get something like this Adafruit Gyro/Accelerometer and just hook it up to the SDA and ...
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1answer
189 views

How can I access the brick id in ev3-g?

How can I access the brick ID ( or brick information) in ev3-g?
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1answer
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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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1answer
775 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 ...
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1answer
418 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. ...
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1answer
374 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 ...
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1answer
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Connecting EV3 to Mac over Bluetooth without Lego Mindstorms software

I am trying to connect the EV3 brick over Bluetooth to a Mac so I can use direct commands to send bytecodes. However, the Bluetooth connection remains active only through the Lego Mindstorms software....
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1answer
126 views

Sizesorting machine

I am quite new to LEGO Mindstorms, and can't seem to wrap my head around this one. I am making a size sorting machine, sorting brick sizes depending on the time they take to pass the lightsensor. So ...
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1answer
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EV3 turning in circles

New programmer feeling my way around. I set the most simple "steering block" to 25, the power to 50, and the number of motor rotations to 40 or 50. Then I let it run expecting the bot to go in a ...
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1answer
239 views

Can I identify the colour of objects 5mm in diamater with an EV3 Colour sensor?

My plan was to make a simple robot to sort beads like this:. Its the Hama Medium size beads, they have a diameter of 5mm so they are fairly small. After some testing, reading and asking here I figured ...