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Questions tagged [ev3]

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

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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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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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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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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
370 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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38 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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How can I have EV3 Commander App continue running the motor when I release the slider

I 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 are option with EV3 ...
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72 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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41 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
94 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
80 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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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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57 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 ...
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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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262 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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49 views

Sound block play file doesn't work

When sound block is used and play file is selected nothing happens. No sounds are available to select. I have uninstalled and reinstalled the ev3 software, but the problem persists.
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1answer
55 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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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
149 views

how to access the brick id in ev3-g

How can I access the brick ID ( or brick information) in ev3-g?
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208 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
131 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
101 views

EV3 does not react to commands (sent via bluetooth) 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
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Help with Multiple Motors/ Intelligent Bricks and coding/ programming/ daisy chaining

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 transfer the ...
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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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156 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. The program has 2 main loops, titled "touch" and "end" with two more nested in the "touch" ...
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117 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
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EV3 touch sensor specs relevant for a brick-built MOC

I want to integrate the following EV3 touch sensors (45507) into a MOC: For aesthetical 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
333 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
640 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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110 views

EV3 low battery communicate right after startup

I just bought 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 EV3 kept saying but the ...
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2answers
145 views

The center “ok” button does not work

My son has Lego Mindstorms EV3. The brick turns on when he pushes the center ok button, but he can't use it in the menu. What's the problem?
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1answer
43 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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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?
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1answer
251 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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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 ...
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1answer
192 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 ...
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1answer
64 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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EV3 Home edition for mac missing import block option

I'm running EV3 HE 1.3.1 on mac 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 to ...
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158 views

Why can't I install the NXT software?

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
224 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 ...
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1answer
301 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
137 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
182 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, how do I write an infinite loop ...
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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
385 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 ...
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1answer
350 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 ...
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1answer
72 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 ...
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1answer
461 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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1k 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
460 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 ...