Questions tagged [programming]

Questions about programming the various LEGO programmable bricks, including Mindstorms (EV3, NXT, and RCX), Wedo and Scout, in either the provided languages and editors, or more advanced languages.

Filter by
Sorted by
Tagged with
1
vote
0answers
158 views

Strange blocks appeared in my program

In my Mindstorms program, I found these strange blocks. They appeared when I sent this program to my other PC on Windows 10, which is more powerful. They don't work and I can't change them. Mindstorms ...
3
votes
1answer
47 views

Any way to get the current motor position or angle in WeDo 2 (when accessing hub via BLE protocol)?

I have managed to write a small C# program that lets me play around with the WeDo 2 hub. I can read sensor values or set the speeds of up to two connected WeDo motors independently (I am aware that ...
22
votes
8answers
14k views

Can you program Lego Mindstorms with the Scratch programming language?

My child is learning programming using Scratch in school. Can she program her Mindstorms using Scratch?
2
votes
1answer
55 views

EV3 program runs fine when connected to PC but does not respond when copied to the brick

I am building the race car mentioned in the LEGO Mindstorms discovery book using an EV3 brick. The problem I am facing is that the driving program runs fine when the brick is connected to the PC via ...
5
votes
4answers
4k views

Which programming environments or APIs are available for the LEGO BOOST?

Over the holidays I tried the following Python library: https://github.com/undera/pylgbst but I couldn't get it to work. Then again my knowledge of Python is very limited. I'm more experienced with C+...
1
vote
0answers
43 views

EV3 square pattern motion

I'm trying to make my EV3 robot move in a square path, and an infinity path. I've tried this code for a square path but it's not working.
1
vote
2answers
122 views

How do you display multiple items at once on an EV3 screen?

I'm trying to make a program on the EV3 that will imitate the shutdown process. At first, I wanted to make my life easier by naming the program "Shutting Down" and not interfere with the display in ...
4
votes
2answers
319 views

How to make an exact 16 degree turn?

Does anyone know how to make an exact 16 degree turn with a LEGO robot?
1
vote
0answers
84 views

EV3 software crashes when coding color sensor switch, how can I fix this? [closed]

When students use the switch block to program the color sensor on their Chromebooks, the app crashes. We have all accessibilities turned off and the OS is fully updated. What other troubleshooting ...
1
vote
1answer
76 views

Online link to the LEGO NXT firmware (v1.31) source code or IAR ARM LEGO development tools?

I am looking for the source code to latest NXT firmware (v1.31). I found the binary image is on LEGO site: https://www.lego.com/en-us/themes/mindstorms/downloads, but no links to firmware source code ...
0
votes
1answer
87 views

Where to start with a custom firmware for the NXT

In the process of hardware hacking with my NXT 2.0 I Found no easy way to connect the device as a USB storage device. Is there a specification that states how the NXT interacts over USB, or should I ...
5
votes
2answers
214 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.
2
votes
0answers
79 views

Lego Mindstorms Software: “Error code: 4”

After updating my EV3 Brick's firmware from V1.09E to V1.10E and reinstalling the Teacher Edition of the Lego Mindstorms EV3 software (even though I'm not a teacher), I decided to recover my Brick's ...
1
vote
1answer
159 views

Where's the iNXTG app for programming NXT from iPad?

I'm trying to find the old iNXTG to program NXT bricks via iPad but it is no longer available in the Apple Store. Does anyone know if there exists an archive for programs like that? The problem is ...
5
votes
2answers
297 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, and now I'm wondering how I'm ...
4
votes
1answer
48 views

Is there a duplicate/copy paste function in Lego Mindstorms Ev3 programing?

I remember, when I first started out Lego Mindstorms, there was a copy and paste (duplicate) blocks function. I could highlight and right click the blocks then press on duplicate to make another copy ...
3
votes
1answer
60 views

Error message when using loop index as an array index to get value in arrays

My program moves an ultrasonic sensor around 260 degrees and the values are recorded down in an array variable every 2 degrees it turns. It moves back and measure it 3 more times, storing each ...
5
votes
1answer
1k views

How to build an automatic Lego train system?

I was wondering if anybody has ever tried using the IRLink NXT sensor to make an automated train system and if so, what kind of setup did you have to make it all work? I have been working on a train ...
2
votes
3answers
679 views

How to retrieve a deleted program file from the lego NXT

I have been programming a complex file for my Lego Mindstorms NXT. I accidentally deleted my file from the PC, but it is still available on my NXT brick. Is there any way that I can retrieve the file ...
0
votes
1answer
280 views

Is the EV3RSTORM from Lego Mindstorms programmable using a real programming language? [duplicate]

I'm a software developer and Lego fan. I'll create a robot with Lego Mindstorms, but I'll like to know that the is EV3RSTORM is programable using a real programming language (Python, C#, JavaScript, ...
2
votes
3answers
3k views

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 ...
2
votes
0answers
61 views

How to get Lego Mindstorms EV3 expansion set (45560) programmes in Scratch

I bought recently Mindstorms EV3 expansion set (45560) and found out that the available programs are written in old LabView-style programming language: https://le-www-live-s.legocdn.com/sc/media/files/...
8
votes
5answers
9k views

Is it possible to edit a MyBlock input parameter value?

I have created MyBlocks but want to change the input parameter to negative. Is this possible or must all the MyBlocks be re-written?
5
votes
1answer
2k views

Can't send multiple commands to EV3 using Python

I want to use Python to send commands to an EV3 brick. In C++ things work as expected - for instance, this starts the motor on port A and then stops it after a while: #include <unistd.h> #...
0
votes
0answers
63 views

Bluetooth connection between EV3 brick and MacBook Pro fails after 2 seconds

As I was adviced, I searched for same questions before posting mine but although some are similar, I can't make their answer useful for my problem. I have a Mindstorms EV3 Education brick and a ...
0
votes
1answer
370 views

EV3, menu with the buttons?

I've been trying to make a menu that when you press the < button on the block it will start and > button to stop. The menu will also only occur at the start, it will not be ongoing. I've ...
5
votes
4answers
11k views

EV3 Brick Error Symbols?

I am currently developing an EV3 robot that sorts colored technic beams. However, the brick will only run part of the program and then generate a strange error code on the brick's screen. The error ...
8
votes
1answer
2k views

Where can I find documentation on the LEGO Wireless Protocol for Powered Up devices?

LEGO BOOST and LEGO Powered Up Smart Hubs use Bluetooth Low Energy to communicate to apps. Where can I find documentation on the communication protocol so that I can build my own app for these devices?...
2
votes
0answers
111 views

How do I make a single arm double tap a piano key?

I am trying to make a Lego play piano from ev3, where I have connected two arms to a single motor on either side using Lego elements. Both the arms move counter clockwise to one another (if one plays ...
5
votes
5answers
2k views

IDE recommendations for EV3 programming

Does anybody have any recommendations for non-GUI programming of the EV3 unit? I'm impressed by the LabVIEW software, but as a professional C# and VB.Net programmer (with C, C++ experience), I find ...
4
votes
1answer
7k 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. ...
2
votes
1answer
3k views

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 ...
0
votes
1answer
84 views

LEGO EV3 Ultrasonic sensor missing from Home Edition programmer [duplicate]

I'll get straight to the point: When I open my LEGO MINDSTORMS EV3 Home Edition programmer and try to use an ultrasonic sensor, there is no option for it in any blocks. I don't even see any allusion ...
1
vote
1answer
859 views

A 90 degree turn with Wheel part number 56145

I'm making a program for my ev3rstorm and I want it to have a 90-degree spin turn. I use the standard part ev3rstorm wheelbase or rather, treadbase. Using the move tank block (I use that block all the ...
1
vote
1answer
56 views

How to make Spik3r move without the pincers moving

How do you make Spik3r move without the pincers moving as well? Seems like the legs are only controlled by the motor on port B, but the move tank and steer modules only allow for the use of 2 ports. ...
8
votes
1answer
5k views

Mindstorms 2.0 can't download to NXT brick with error 142023

Using Mindstorms education 2.0 on a Windows 7 computer I can't seem to get the program to see the NXT via USB or bluetooth dongle. When connected by USB nothing appears in the NXT window with device ...
6
votes
6answers
6k views

What are the programming languages that can be used on Lego Mindstorm EV3?

My son is interested in robotics. For me, I would like maximum flexibility for programming. For my son, I guess something simpler would be preferable so that his interest is not killed by complexity ...
3
votes
3answers
444 views

Could not open serial port or USB device, RCX on Linux

I am trying to use my old RCX 2.0 set on Linux (Xubuntu). The problem is that when I try to download the (official) firmware into the RCX via the command: nqc -Susb:/dev/usb/legousbtower1 -firmware ./...
1
vote
1answer
236 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 ...
2
votes
1answer
239 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 ...
0
votes
1answer
176 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 ...
2
votes
1answer
66 views

Unsure of how to use a switch that is time dependent

Have been trying to make a line follower that can auto-correct itself if it would lose the line. The follower is supposed to turn around, go forward and catch the line if the line has not been ...
0
votes
1answer
84 views

Detect distances over 255cm with EV3 ultrasonic sensor?

In my use case, I have to detect things about 3-4 meters. I don't need to be accurate, +-2 or 3cm is enough. The EV3-G and most other places have a max distance of 255cm, which I understand that it is ...
1
vote
0answers
516 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" ...
2
votes
1answer
205 views

LEGO mindstorm - which product to use to make projects mentioned below

I'm planning to buy a Lego Mindstorms kit for the following projects. I haven't really used Lego before - my friend asked me to consult him about projects (I use microcontrollers and build robots from ...
3
votes
0answers
361 views

Creating custom blocks using EV3 block developer kit

I am trying to develop a custom block using ev3 block development kit but I get nowhere. I created the XML files according to the documentation and the VIX file but it does not compile, I cannot ...
2
votes
1answer
97 views

Rearing off to the left without telling it to

I've started to build a robot, but when it drives it veers off to the left even though I'm just telling it to go straight. I think I need to do something to the motors but I don't know what or how. I'...
2
votes
1answer
97 views

How to distinguish between objects using a sonic sensor?

I am trying to find a ball in the field, grab it, and drop in the specified area. I'm using an ultrasonic sensor on the front of the robot. My current solution for locating the ball is: Turn ...
7
votes
2answers
643 views

Ultrasonic problems with the red and blue balls?

I'm still new to NXT, I try to make the robot locate a ball using the ultrasonic sensor, while there I should be in a square area marked by white color. How can I make the robot locate the object (by ...
2
votes
3answers
5k views

Programming NXT color sensor with NXC?

Currently I am working Lego robot that solves 2x2x2 Rubik's cube. I am programming Lego Mindstorms NXT 2.0 color sensor in BricxCC. I already have RGB data with the command ReadSensorColorRaw. I ...