Questions tagged [ev3]
EV3 is the current generation of LEGO MINDSTORMS, released in 2013.
339
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T-R3X the look My Block problems
OK I am making the look My block for the T-R3X program but there is this block which don't know how to make at the end of the diagram in the book.
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31 views
How to make ev3 follow moving object with ultrasonic sensor [closed]
I have an EV3 and am part of a sumo tournament. We want to make it follow the other robots, but am not sure how
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29 views
how to send direct command to ev3 brick
I am new to ev3 python but am working on a project. I was reading about NXT-python that " It works by sending the direct commands detailed in LEGO's "Blue-tooth Development Kit" to the NXT brick" I ...
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14 views
changing ev3p file back into an ev3 project file
how do I change an ev3p file into an ev3 project file. Everytime that I click on the ev3p file to open it, it turns up as text in notepad.
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38 views
What does this error symbol on the EV3 mean?
I get this error image pop up when I power on my EV3. What does it mean?
Also, is there a list of different error codes anywhere, I looked in the User Manual and I could not see anything.
Cheers!
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The HiTechnic Color sensor is not detected in the port view in lab view
When I inserted the HiTechnic Color Sensor Block into the Ev3, the Ev3 detected the color sensor. But in my Mindstorms lab view, the HiTechnic color sensor does not appear on the port control. Can ...
2
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1answer
40 views
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
32 views
Is there a way to restart a program with EV3?
I've got a program with a code lock, and I would like the program to restart when you enter the incorrect code. Does anyone know of a way to do that?
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1answer
56 views
How to make of point coordinate system for EV3
I'm trying to make a internal coordinate system for an EV3 Python project I'm doing, but at a complete loss on how to do it. It needs to keep track of how it moves (with wheels) in an X, Y coordinate ...
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1answer
90 views
Run Code From PC
https://www.ev3dev.org/projects/2014/05/09/Python-Rubiks-Cube-Solver/
The other one gives a solution in around 20 steps, but takes around 500 MB of memory, so I need to run it on a computer
How do I ...
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2answers
90 views
What does this symbol on the EV3 Brick mean?
I can’t figure out how to get my R3PTAR to open and close it’s mouth to bite. I keep getting this symbol. What does it mean?
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EV3 Brick is Stuck on Red
The EV3 brick started by flashing red. Then started where it is stuck on two red buttons. Have changed batteries, and manual reset with no change.
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1answer
40 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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38 views
Using switch block with Hitechnic color block
Can I compare the Hitechnic block --> measure --> color output in a switch block? For example, if the Hitechnic color sensor is seeing black, then do something, else do another thing. If not, then how ...
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2answers
99 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), ...
3
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1answer
62 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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0answers
37 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
50 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 ...
2
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1answer
58 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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1answer
79 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
66 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
41 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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46 views
EV3 Spinner factory not moving in the right order
We've built a spinner factory going by the original instructions in the Lego Mindstorms EV3 Education Software, and downloaded the program for it onto the bricks, the Spinner factory moves around, the ...
4
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1answer
92 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
45 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
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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 ...
3
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0answers
44 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 ...
2
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0answers
116 views
How many rotations or degrees do you need to turn your robot?
I have an EV3 Home edition. I have made a tribot. 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.
Does ...
2
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3answers
120 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
196 views
Is EV3 Device Manager still active?
Link to https://ev3manager.education.lego.com/ is broken - will this be fixed?
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1answer
618 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
108 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
344 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
98 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?
2
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1answer
47 views
What is this EV3 controlling app
What is this EV3 controling app that is used here:
https://youtu.be/Sjix76QjtMU?t=1m43s
2
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1answer
165 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
126 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 ...
3
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0answers
103 views
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 ...
2
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2answers
93 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
2k 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 ...
3
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1answer
51 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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1answer
73 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 ...
2
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1answer
101 views
What kind of mat do you use for running Mindstorm EV3?
Turning Ev3 precisely has been a problem. Do you use a mat for running EV3 on. Can you tell me on what material to get the mat printed?
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182 views
Bricx Command Center says “No connection to the programmable brick”
I saw that Laurens Valk in THE LEGO® MINDSTORMS® EV3 DISCOVERY BOOK thanks John Hansen for the EV3 screen capture tool, and, upon further investigation, I found and installed Bricx Command ...
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1answer
271 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 ...
6
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1answer
450 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
40 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
120 views
EV3 Ultrasonic Sensor (45504)
I leanred that EV3 Ultrasonic Sensor (45504) is out of stock for a long time.
I wonder if the sensor is being discontinued due to accuracy problem?
Is there any alternate version of "Gyro Boy" that ...
0
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1answer
180 views
lego mindstorm ev3 education 1.4.2 for Windows crash when open 2nd projects
EV3 open first project no problem, but when I open second project it crash and exit.
I tryed install EV3 software on Windows 10 (MS Surface laptop i7,16GB RAM), or on Windows 7 (Thinpad i5, 16GB RAM), ...
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2answers
1k 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 ...
