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.

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56 views

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
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1answer
125 views

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
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1answer
146 views

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 ...
2
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1answer
37 views

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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57 views

"Heads up! Could not open project" error message in EV3 software

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 ...
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1answer
44 views

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 ...
5
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1answer
253 views

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 ...
4
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1answer
91 views

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 ...
3
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1answer
113 views

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 ...
3
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3answers
161 views

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. ...
3
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0answers
47 views

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 then move the file to the robot. But since I'm on chromebook I don't see ...
4
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0answers
39 views

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.
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1answer
63 views

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 ...
4
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0answers
83 views

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 ...
12
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2answers
2k views

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 ...
2
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2answers
183 views

How to get a random value in the LEGO Mindstorms Robot Inventor software

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 ...
4
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1answer
534 views

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 ...
9
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2answers
839 views

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.
8
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1answer
147 views

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 ...
0
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1answer
147 views

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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1answer
205 views

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 ...
4
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1answer
135 views

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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0answers
196 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
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1answer
79 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 ...
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0answers
70 views

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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2answers
366 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 ...
4
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1answer
777 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
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1answer
75 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 ...
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2answers
252 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 ...
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1answer
120 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 ...
2
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0answers
209 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/...
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0answers
149 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 ...
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0answers
510 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 ...
2
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1answer
95 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 ...
2
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0answers
171 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 ...
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1answer
208 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
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1answer
65 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. ...
0
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1answer
346 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, ...
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0answers
93 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 ...
0
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1answer
127 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 ...
2
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1answer
131 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 ...
1
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0answers
44 views

T-R3X the look My Block problems [duplicate]

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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2answers
208 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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0answers
66 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 ...
2
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1answer
101 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'...
0
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1answer
246 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 ...
0
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2answers
299 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 ...
5
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2answers
222 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
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1answer
274 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 ...
2
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1answer
68 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 ...