LEGO® Answers Stack Exchange
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Questions tagged [ev3]

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

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

Official Resources

477 questions
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Is there a changelog for any firmware updates on an EV3 brick?

When a firmware update is released for the Mindstorms EV3 brick, are there usually any changelogs for them explaining what's been added or changed? If so, where can they be found?
user5971
9
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3 answers

What is known of the capacities of the MINDSTORMS EV3 when it comes to interconnection with a network (WiFi, bluetooth)

What is known of the new MINDSTORMS EV3 capabilities when it comes to netwoked functions. What type of interface can be plugged to interact with a PC or portable device (smartphone/tablet)? In term of interconnection (WiFi/bluetooth) and in term of…
Coyote
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How to remember initial position of a robot and return to it

I have an EV3 robot with motors, like a car, that can move forward/backward and left/right and have some sensors attached. I want it to remember its initial position by remembering all the movements of motors when robot starts moving, then after…
Sergei Basharov
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Is it safe to try different firmwares on EV3?

I have prepared a SD card to run Lejos on EV3, as said on Lejos Sourceforge page and I'm about to test it. What worries me - will I still be able to go back to original Firmware if something goes wrong or I'd like to go back to this original Lego…
Jakub
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Understanding the makeup of an XML .ev3p file

When you unzip an .ev3 program, there are many txt and xml files that are inside. In particular, there is an xml file produced with the filename extension .ev3p, which seems to contain program instructions which the EV3 brick can then interpret and…
Nick M.
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5
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1 answer

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 stop and restart, however on restart the text…
Agent Zebra
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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?
xavi
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4
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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 anything I can do to update it?
Lori
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4
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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 few seconds, to check differing light levels work?
callisto
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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 to theoretically build an EV3 from scratch?
Kurtoid
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4
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1 answer

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 image files to the brick? They are so easy to…
mrspaghetti
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4
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1 answer

EV3 brick cannot connect my to computer

I can't connect my brick to my computer. It keeps saying it can't communicate with the brick. My brick has no firmware. My friend said to change the USB cable but it still doesn't work. I can't connect it via Bluetooth either.
user3223
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EV3 screen either flickering or blank, what do I do?

The screen on my LEGO MINDSTORMS EV3 brick has just stopped working. It is blank. I have tried turning it on and off, installed fresh batteries, and I can even hear the selection sounds. Additionally, it responds regularly when I connect it to my…
hydra games
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4
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Is it possible to power an EV3 hub via USB?

I have a LEGO Mindstorm EV3 hub. I want to avoid buying rechargeable batteries by supplying power through battery box pins using an external variable power supply. Is it possible to supply power to an EV3 hub via USB?
amreo
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3
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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 is my current program: The result is odd: it…
Simone Chelo
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