Questions tagged [programming]
Questions about programming the various LEGO programmable bricks, including Mindstorms (Robot Inventor, EV3, NXT, and RCX), Wedo, Spike and Scout, in either the provided languages and editors, or more advanced languages.
214
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What is the difference between LOCAL memory for programs and LOCAL memory for Direct Commands?
I've learned a bit about Direct Commands in EV3 and understood the work of Local and Global memory. Using the Direct Commands I can access the memory using an offset of the accessing byte/bytes (like ...
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4
votes
2
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220
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Does LEGO make a electronically controlled pneumatic valve bank?
I've decided to try my hand at building a working LEGO Concrete Block Making Machine, as shown in this picture:
with the idea being that the machine will be controlled by both manual and automatic ...
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3
votes
1
answer
90
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Problem with emulating EV3 brick via wifi
I'm trying to emulate Lego EV3 brick connection via wifi. First I found the repo and rewrote it a bit in C# so now I have this:
LabVIEW.cs
public class LabVIEW
{
public string Serial { get; set; }
...
- 155
3
votes
0
answers
123
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LEGO Studios Movie Maker Camera (1349) (2000)
A few months back I had purchased the LEGO Studios Movie Maker Set (1349) and have been tampering with it, specifically the camera, to see if I can get it to work on my Windows 11 laptop. Was able to ...
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1
vote
1
answer
76
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Mindstorms program error when I play in download mode
I can run the program perfectly in the streaming mode, but it will flash a red light in the download mode after getting 5 points. Below is my program code:
...........Updated.............
Finally I ...
- 11
0
votes
0
answers
55
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One of EV3 motors doesn't respond in demo program
I just bought the EV3 set and made the "TRACK3R" model. When I run the demo program from LEGO the port B motor does not work - only the port C motor is works. But if I try "Motor ...
2
votes
1
answer
79
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Direct command to set EV3 motor speed
I am trying to set a EV3 motor's speed and start it remotely using a direct command. Using the resources LEGO MINDSTORMS EV3 Communication Developer Kit (page 24) and LEGO MINDSTORMS EV3 Firmware ...
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0
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1
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467
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How I can connect the LEGO SPIKE Prime hub via Bluetooth in Visual Studio Code using the pybricksdev library?
I'm trying to send some data from the hub to the terminal for some debug. But I can't figure out how I can connect the hub via Bluetooth to my PC. I tried to look in the API documentation and maybe I ...
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4
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2
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What is the gyro sampling rate on the Spike Prime hub?
I was wondering what is the inertial measurement unit sampling rate, because for my project I need 800 Hertz. I tried to look in the firmware file but I didn’t find anything. I use the pybricks ...
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4
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3
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Is it possible to have a motor default to a certain position at the start of the code? I'm trying to use the motor as a servo, and it's annoying
The motor is attached to a "door", which rotates to block off an opening. I have it coded to manually go back 1/4 of a rotation, and the distance sensor attached will send it forwards 1/4 of ...
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Mindstorms M.V.P. model doesn't move
I'm a total newbie to Mindstorms 51515.
I am trying to program my M.V.P. model and everything seems to work except the movement programming blocks (pink). Does anyone have a hint or a clue about what'...
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3
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Is it possible to re-flash the LEGO Spike Prime Hub with Mindstorms Robot Inventor Hub Firmware while retaining all functionality? And if so, how?
Unfortunately, LEGO has recently announced that after 24 years, the Mindstorms line of Robotics Kits is officially being discontinued at the end of this year. For this reason, the 51515 Robot Inventor ...
4
votes
2
answers
176
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How to change colour of the bluetooth/charging RGB LED in the hub?
I have the Mindstorms set 51515 - Robot Inventor. I want to display the progress of a robot's work using the LEDs.
How can I change the colour of the RGB LED that the hub uses to indicate the ...
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5
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1
answer
307
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How do I copy blocks in LEGO 51515 block IDE?
I have been trying to copy and paste blocks in the new IDE that I downloaded from the Microsoft store (v 10.3.1). I do not seem to be able to copy block code from one project to another. How can I ...
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4
votes
1
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103
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Accessing an EV3 brick on computer without MINDSTORMS Home
I am trying to hack my EV3, and I know I can make it execute commands I send via USB thanks to the communication developer kit.
When I connect it via USB, it is only visible by the MINSTORMS Home app ...
3
votes
1
answer
228
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How to cross compile for ev3dev using Docker
How to add ev3dev libraries/headers to docker cross-compile setup?
I have assembled ev3dev on BrickPi (with Raspberry Pi 1 - chip BCM2835). I think, it all should be pretty similar for EV3 brick too. ...
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votes
1
answer
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Looking for a PC controlled motor that allows for very small and precise movements
The image below is a LEGO specimen stage designed for a stereo microscope. I am looking for a recommendation for a PC controlled motors that allows for very small and precise movements.
I want use ...
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3
votes
1
answer
114
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When using Mindstorms Scratch-like development tool for EV3, is it possible to move a single or a few selected blocks somehow?
Say I have 10 random blocks in a line.
Is it possible to move number 4 to position 1 without also moving block 5-10?
As far as I have managed to move blocks all following blocks also gets moved even ...
- 31
2
votes
2
answers
261
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Multiple Programming Blocks Running at Same Time
My team created a simple program to drive robot out. It consists of a MyBlock to drive straight a specified distance and speed utilizing the Gyro sensor. The program then activates a third large ...
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3
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"Heads up! Could not open project" error message when opening project
When I try to open my project it gives me error saying "Heads up! Could not open project". Could you please help me? Let me know if you want me to share the file.
We were working on that ...
4
votes
1
answer
877
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Why did the light block change in SPIKE v2.0.0+?
I found Unofficial SPIKE Prime Block Guide, which has following details:
And if you open the SPIKE app (2.0.0 or newer), the light blocks were completely changed:
Is anyone able to explain why?
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1
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How to use REPL on the 51515 hub?
I've just got access to a 51515 Hub and I tried to connect to it as a serial port (with baudrate 115200), however it's spamming the console with motor/sensor data:
{"m":0,"p":[[62, ...
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176
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Ev3 classroom 1.5.2.0 not working
When I try to create a new project or open an old project, the program does not work.
We have 10 computers (desktops) with different versions of Windows 10
Stuck on this.
9
votes
1
answer
554
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robotic inventor\spike prime hubs: Hub 2 hub communication AND led matrix control
Recently the Spike essentials set was released, including the very interesting 3x3 led matrix part:
The matrix allows to set each individual pixel in the 3x3 array to 10 different shades of 10 ...
6
votes
1
answer
310
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Mindstorm 51515 If then else alternative - like a switch statement
Is there a way to act on multiple values for a variable? For example, x may be 1, 2, or 3. If then else allows for 2 conditions. Multiple "ifs" work, but is cumbersome.
Ideally I'd like a ...
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2
votes
1
answer
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How do you scroll the canvas in EV3 Classroom?
I have EV3 classroom installed on Mac. I am writing a pretty lengthy program that does not fit in a single screen. However, I am not able to figure how to scroll down or move sideways. This should be ...
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0
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182
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"Heads up! Could not open project" error message in EV3 software [duplicate]
Whenever we try to edit one of our old projects our EV3 Mindstorms Home software shows us the "Heads up! Could not open project" screen. What should we do?
I am on the Mac OS Big Sur 11.2.3 ...
0
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1
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EV3G Where can I find the .vix file for the low-level functions? (Set integer, IO operations, start block)
They look like this:
By default, when you refer to a vix file, it looks like this:
<Reference Type="VILib" Name="TerminalTerminal.vix" />
But, to refer to these low-level ...
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5
votes
1
answer
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EV3 not recognizing resistance correctly (MicroPython)
I recently tried measuring the resistance of a thermistor using the .resistance() method, the results are sadly not accurate. I measured the resistance with a multimeter and it showed 100kΩ, while the ...
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4
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1
answer
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EV3-G custom block crashes when Switch statement is copied
My team and I are trying to convert our coding framework made of myblocks into actual blocks. I made an application, that generates a "shell" of the block (the modes, and parameters). After ...
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3
votes
1
answer
375
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Robot Inventor Bluetooth not working
A while ago, I started up the Robot Inventor program and noticed the computer was not connecting. When I clicked the "Connect" button, the loading "circle" simply started spinning ...
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3
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712
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How to stop or freeze the EV3 large motor in position
How do I stop or freeze the large motor in a fixed position? I have a forklift type attachment that will lift to the precise height, but will not stay in position due to the weight of the attachment.
...
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115
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How do I import my programs from makecode (Chromebook) to my EV3 robot
While using makecode I wanted to import my file to my EV3 robot but it says that I have to connect my EV3 robot to my computer and then move the file to the robot. But since I'm on Chromebook I don't ...
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49
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How do I sync audio and movement on my NXT 2.0?
How do I sync audio and movement with my NXT 2.0? I'm building an animatronic head and I can't find a good way to sync it with external audio because the internal speaker is too quiet.
0
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1
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Program just stops motors and won't move
I'm trying to make a program in the NXT software that turns on the motors unlimited, then waits until something is less than 30 cm, stops the motors, turns to the left 30 degrees and saves the value ...
- 11
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0
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224
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Migrate Lego Boost Android app data to another device
I have a Lego Boost Android application installed on device #1 and the app is logged into my LEGO cloud account (the same used for Lego Life etc. too) and is fully synced with cloud. On this device I ...
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Where can one find the documentation for the LEGO Mindstorms Robot Inventor software?
Is the documentation (either official or unofficial) of the programming "language" for the LEGO Mindstorms Robot Inventor software available somewhere? Preferably online, without requiring ...
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How to get a random value in the Robot Inventor software (Python)
I am making a Python program with the LEGO Robot Inventor software which will, among other things, turn the robot a random amount periodically, which of course requires a random number. However, I ...
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1
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574
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When using pi * distance between wheels/tracks, how do I measure distance between wheels?
I am trying to make a program that requires my 51515 to turn a specified number of degrees. I found a way to do that on the LEGO app's "Knowledge Base", but the given example was:
import ...
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9
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2
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Programming on a chromebook with EV3
How do I install the new Lego block programming software on a chromebook? We have the standard version, but want the new one that looks like Scratch.
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Help with my Ev3 printer
I'm building an image printer using my ev3 set and several more pieces, as a project to keep me occupied while I'm stuck at home.
Here's how it looks:
I've done the build part, the way I've chosen to ...
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1
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156
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Using Power functions to teach robotics
I am a robotics engineer and I would like to introduce and teach my girlfriend to robotics. I would like to first get her the material for the first project. I would love to build a small Lego car ...
6
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1
answer
365
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Why doesn't my LEGO Micropython remote control program work?
I am writing an EV3 micropython program meant to test my remote, but it does not work. When I run it, I see no errors at all. Instead, I just see a "play" symbol and the program continuously ...
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1
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Automating self built models
I have just started with Lego, building the excavator with the 2 Bluetooth hubs. Can I program a model I build using this type of hub and motors or do I require EV3 (if indeed EV3 allows you to ...
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0
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201
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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 ...
- 27
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votes
1
answer
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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 ...
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EV3 square pattern motion [closed]
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.
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3
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1k
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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 ...
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1
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2k
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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 ...
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3
votes
1
answer
142
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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 ...
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