Questions tagged [ev3]

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

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1answer
96 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 ...
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1answer
163 views

Improving EV3 Screen Readability

I often have a hard time reading the EV3’s LCD display. I presume that I’m not the only one who has experienced this issue. Is there a way to improve its readability? For example, are there any good ...
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2answers
261 views

Color sensor reliable?

I am experimenting with the light sensor shipped within the mindstorms ev3 package. My Problem is that the bot is standing quiet at one place. Each value returned by sensor is different, although the ...
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1answer
225 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 wheels are motorized. When I run the following code: Motor.A.backward(); Motor.D.Backward(); both motors are ...
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1answer
230 views

Using two color sensors simultaneously

I am new to the world of robotics, and I'm preparing a new project with my students. Our goal is to make a self driving robot that can read colored signs from the road in order to turn right or left a ...
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2answers
284 views

Can't link variable inside a switch when creating a new block

I have a problem when connecting the variable (from the create a block) to a variable in the function because it's inside a switch. How can I link them? I want to connect the variable to each (20) in ...
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1answer
193 views

LEGO Mindstorm EV3 Line-With-Gaps Follower? [Robotc]

Trying to create an algorithm / code in order to get my robot to follow a track which it currently can do, using a color sensor and following the inside edge. So I'm wondering how to transition to the ...
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2answers
218 views

How to mirror an EV3 motor?

I want to get one EV3 large motor to copy the other. So if I move one half a rotation the other copies.
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1answer
348 views

How to connect an NXT brick to the LEGO programmer application on an iPad?

Can you connect a NXT brick to an iPad via either USB cable or Bluetooth? For me neither seem to work even though the EV3 brick (and the LEGO programmer application) should be backwards compatible. ...
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2answers
85 views

Buy the complete EV3 set or only the brick?

I have an old NXT (or NXT 2.0, do not remember exactly) bought I think in 2007. I would like to upgrade to EV3, but I am not sure if I should buy the complete set or only the central brick. Is there ...
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245 views

Read power usage and respond when motor is straining

Is there a way to know if the drive wheels are "straining", like when locked up with an opposing bot? This is for a Lego sumo bot using the Lego Mindstorms Education EV3 Core Set (EV3 Large Motor ...
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1answer
936 views

Using a remote control for an EV3 robot?

I have just started to get into using a LEGO Mindstorms EV3 robot. I know you have to create a program on the laptop, then it has to be downloaded to the EV3 block. Can you use a remote control to ...
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0answers
765 views

How many rotations or degrees do I need to turn my robot?

I have an EV3 Home edition. I have made a tribot. It has two main motors for the wheels and a caster in the back. To complete a full turn in place I need to set the rotations to 2.32 or 835 degrees. ...
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3answers
334 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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1answer
1k views

Is EV3 Device Manager still active?

Link to https://ev3manager.education.lego.com/ is broken - will this be fixed?
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7k views

How to install Firmware 1.10E on an EV3 home/retail edition brick

If and how can you install firmware 1.10E on an EV3 brick from an home/retail edition set (instead of an education set)? Updates 1.0E9 are only recognized from the Mindstorm software, also with ...
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1answer
143 views

How I can program a solar panel heliostat? [closed]

I want to make a program for an EV3 solar heliostat. It consists of two motors and a color sensor. I want it to follow the light. The station is fixed. EV3SolarStation pdf
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0answers
886 views

Lego EV3 simulator and programming

I've been searching and testing for hours. There is little information on this subject though. I have some specific requirements for a Lego EV3 simulator and programming environment. I do not want to ...
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2answers
385 views

How do you convert the ev3p program files and assets back into an ev3 project file?

I edited the ev3p file, and I want to see the changes by opening it in the ev3 IDE. How do I convert all of the files back into an ev3 project file?
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1answer
57 views

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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1answer
478 views

How can I get the EV3 to control an ordinary motor with PWM?

Looking at the hardware developer pdf, it looked like the EV3 should output a PWM signal with a duty cycle corresponding to power level. It does, but only for 100ms and only on pin 1. Is that how the ...
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1answer
230 views

Why does the Gyro Sensor not work correctly in Virtual Robotics Toolkit?

I somehow found out about Virtual Robotics Toolkit and when I did, I decided that it would be great software to use for Lego League. Later in my research, I found that it automatically had the newest ...
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0answers
315 views

EV3 Brick and Commander app Bluetooth disconnecting

On iOS 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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2answers
454 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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3answers
4k views

Lego Mindstorms Ev3 home edition on Mac OS Mojave bug - bricks sometimes go blank

I have a fresh install of Mojave and of Mindstorms Ev3 home edition. It seems to work fine but then randomly all the information disappears from the blocks at the bottom of the screen, and sometimes ...
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1answer
59 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?
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1answer
201 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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1answer
366 views

What kind of mat do you use for running Mindstorm EV3?

Turning EV3 precisely has been a problem. Do you use a certain mat for running EV3 on? Can you tell me what material I need to get the mat printed?
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1answer
803 views

Why do I not have the Brick Datalog app in the LEGO Mindstorms EV3 V1.10E firmware?

I realize a similar question has been asked (you can view it here) however mine is slightly different. I have a Lego Mindstorms EV3 Home Set 31313 and due to recommendation, I installed Lego ...
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1answer
1k views

Is it possible to use 5 motors on an EV3 brick?

The EV3 brick has only four output ports (A B C & D) to run motors. Is there any way to use port 1 (sensor port) to control a motor?
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1answer
79 views

Can I install EV3 Education software and Retail software side by side?

I have EV3 Retail edition and I like to buy required sensors and build the robots come with the education edition of EV3. I have lots of LEGO Technic spare parts so I expect I can find alternate parts ...
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1answer
208 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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1answer
488 views

Mindstorms EV3 education 1.4.2 for Windows crashes when opening second project

The EV3 software opens the first project with no problems, but when I open a second project it crashes and terminates. I tried to install the EV3 software on Windows 10 (MS Surface laptop i7,16GB RAM),...
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2answers
3k 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 ...
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2answers
2k views

How to make a Lego Mindstorms ev3 self driving car?

I recently got the Lego Mindstorms EV3 kit. I wanted to make a self driving car, but I got stuck on the building part. I saw another question like this, however it was for NXT and had no decent ...
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1answer
429 views

Stepping through Mindstorm program for debugging

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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2answers
341 views

EV3 brick not turning on, nothing on display?

Ev3 brick not turning on, nothing on display, just red leds are on, tried 3 buttons not working.
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1answer
223 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
1k views

Mindstorms EV3 Spinner factory complete code problem

I recently posted a question about the creation of My Block. Now I have another problem. I have written the code as described in the program description, and double checked it, but it still doesn't ...
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1answer
572 views

Lego mindstorms ev3 spinner factory problem

I hope you can help me with this. I'm on an education where we practice all stuff about IT. I'm currently working on the Spinner Factory project in the EV3. However, when i looked through the program ...
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1answer
279 views

EV3 does not react to Bluetooth commands after 1.7 seconds

Short description: I want to send commands via Bluetooth to an EV3 brick from a Linux computer. I use python to send bytecodes via Bluetooth and not any EV3-specific software Pairing the device was ...
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1answer
261 views

Help with Multiple Motors/Intelligent Bricks and coding/ programming/ daisy chaining

I have built the accompanying robot earlier in the week. I have a challenge where the robot needs to find white/black bricks then store them on a tray and then travel over to another robot and ...
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0answers
117 views

Function in EV3 Basic

I have been programming in basic for ~30 years. I want a translation of the following code into EV3 Basic: function index( x , y ) return x + y * ( maxx , + 1 end function sub look for i = 0 ...
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550 views

Loop interrupt stops all loops, not just the one designated

I have been using loop interrupts for a while, and not had an issue... until now. And it is driving me nuts. My program has 2 main loops, titled "touch" and "end" with two more nested in the "touch" ...
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2answers
388 views

Steer with the LEGO Mindstorms EV3

In my workshops I get asked regularly, what the turn option of the default steering block means (see the image). Obviously, if the turn option is set to 0, the robot is moving forward. A positive ...
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1answer
62 views

EV3 touch sensor specs relevant for a brick-built MOC

I want to integrate the following EV3 touch sensors (45507) into a MOC: For aesthetic reasons, I want the MOC to be mainly built out of system bricks and plates, with only some internal stuff in ...
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1answer
928 views

Using the unregulated motor block and conversion cable to light LEDs

I have the following setup: It consists out of An EV3 brick A nxt to 9v conversion cable (https://www.bricklink.com/v2/catalog/catalogitem.page?P=x1676) A 20 cm 9v to Power Functions conversion ...
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1answer
8k 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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461 views

EV3 low battery communicate right after startup

I just bought an EV3 and started having battery problems. I am using 6 NiMH 1.5V batteries for my EV3. They lasted for around 10 minutes of work and went flat (that's what the EV3 kept saying but the ...
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2answers
522 views

The center button does not work on EV3 brick

My son has the Lego Mindstorms EV3 brick. The brick turns on when he pushes the center button, but he can't use it in the menu. What's the problem?

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