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Questions tagged [mindstorms]

Please use this tag only for general Mindstorms questions and compatibility. If the question refers specifically to the EV3, NXT, or RCX, then use those tags instead.

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2answers
42 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 ...
3
votes
1answer
29 views

Connecting 2 NXT bricks in order to control motors and sensors from one brick

Is it possible to connect two bricks using a cable (connecting port 4 to port 4) , and then have both programs run by only pressing one button? I want the sensors attached to one brick affect the ...
2
votes
1answer
58 views

Serial tower RCX 1.0 works with NQC but flakey with RIS 2.0

Had this baby for 20 years at this point. Some rubber rot on the cables, but other than that, the set's in great shape. RCX 1.0 with DC-in port. Serial tower. Fresh batteries in tower and RCX. I ...
1
vote
1answer
84 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 ...
1
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2answers
110 views

How to flash a LEGO Mindstorms brick and program it in another language

I have a basic LEGO Mindstorms kit which I wanted to use for testing a very simple object-avoidance project. I am trying to find a relatively simple way to flash the brick and upload scripts to it ...
2
votes
1answer
129 views

EV3 Unregulated Motor - different plus/minus power behavior

I'm helping some fellow Bay Area LEGO User Group builders who want to use an EV3 to power a 9V train. I'm using the NXT to 9V conversion cable (https://www.bricklink.com/v2/catalog/catalogitem.page?P=...
3
votes
2answers
56 views

Angular resolution of NXT motor

I am sure that I read somewhere that the resolution of the motor sensor was 2 degrees, but I can find no mention of this in the NXT Help file. What's more, the motor control block allows the Duration ...
3
votes
2answers
159 views

How to use the ultrasonic sensor on mindstorm NXT

I've been struggling for some time on this. I'm trying to code the robot to move when the distance is above a certain integer and stop when the distance becomes lower than the certain integer. I'm ...
0
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1answer
205 views

Power Function Converter Cable for LEGO MINDSTORMS

This is a follow up to this question: How to use Power Functions with Mindstorms EV3? The question was asked in 2013 (5 years ago). Fast forward to 2018, the product that was suggested in the answer ...
2
votes
1answer
141 views

Could not open serial port or USB device

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 ./...
4
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2answers
135 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?
1
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0answers
79 views

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 ...
4
votes
1answer
51 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 ...
3
votes
1answer
232 views

Which of the LEGO Mindstorms 9797 (NXT Education base set) Software is compatible with Windows 10

I have LEGO Mindstorms NXT 9797 and downloaded the following Windows PC Versions: NXT Edu 2.1F6 PC App ---Education Version NXT Ret 2.0F5 PC App ---Home Version Which one of these are compatible ...
2
votes
1answer
277 views

Lego Mindstorms education NXT 9797 software for a Mac laptop [duplicate]

Where can I find the software for a MacBook Air for the 9797 Lego Mindstorms Education NXT Base set?
5
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2answers
171 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 ...
5
votes
1answer
286 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 ...
4
votes
2answers
919 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 ...
6
votes
3answers
313 views

How to load an RCX from a modern system?

I recently bought a new in box 1.5 Mindstorms kit featuring the RCX. My computer unfortunately does not have a 9-pin connection, and the software does not appear to work on Windows 10. Short of buying ...
1
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0answers
60 views

myblock for a proportional gyro turn that randomly fails when in a larger program

I have a proportional gyro turn myblock that fails when played in a longer program. The myblock works perfectly fine when played by itself. The most confusing thing is that the way it fails seems to ...
1
vote
0answers
392 views

LEGO Mindstorms EV3: Camera recommendation for lane tracking

I am planning to build an autonomous car in LEGO Mindstorms that will use ultrasonic or infrared sensors for collision avoidance and in the future also a camera for line tracking. I am now wondering ...
10
votes
1answer
332 views

Lego Mindstorms EV3: programming language recommendation

I am planning to build an autonomous car in LEGO Mindstorms that will use ultrasonic or infrared sensors and in the future also a camera for line tracking. Currently I construct my programs using the ...
0
votes
1answer
50 views

Mindstorms program - myblocks that work fine when run individually but when executed as part of a larger program, break

We have a line following myblock, which follows the line perfectly if it runs alone. However, if we include it as a block as part of a larger program, it goes haywire when it gets to that step and ...
4
votes
1answer
210 views

LEGO EV3 on Chromebooks

I teach two LEGO robotics classes in middle school and in one of my classes I am using EV3 and in the other NXT. I was able to have these classes because of the Chromebook app, but the problem I am ...
3
votes
0answers
107 views

Spik3r wheels move but the spik3r itself doesn't

Our Spik3r's wheels move but the Spik3r itself does not move. Please see the picture of the back of the vehicle - is it somehow incorrectly built?
0
votes
1answer
420 views

Does the Lego Mindstorms EV3 software work on macOS High Sierra?

Will there be issues with the software, or will it work properly on macOS High Sierra? My Mac: Retina MacBook Pro 13", Early 2015
2
votes
2answers
99 views

Is LEGO mindstorms good for a robot warrior or a small size soccer robot?

I want to know if I can build a warrior or small size soccer robot with LEGO parts? If not, are there any better options?
1
vote
1answer
378 views

How can I connect the LEGO Mindstorms NXT with an iPad?

I'm looking to take advantage of the older generation LEGO Mindstorms NXT robots by developing a companion app for the iPad. I'm aware that non-jailbroken iPads cannot communicate with the robot via ...
5
votes
1answer
147 views

Turn on LEGO Mindstorms robot remotely

I'm thinking to build a robot using either NXT or EV3, then I can control it remotely via WiFi or Bluetooth from my office! It's not difficult to write the controlling codes, but how can I turn the ...
0
votes
0answers
149 views

ev3 brick blocked during running a program

I pressed "Run my program" (a simple one), and it is stuck with "mindstorms sound_turn_on" displayed on the screen. The name of my program is sound_turn_on. I am using LabView to program it. Now ...
2
votes
1answer
150 views

EV3 switch block does not recognize text?

i am using file access to input variables into my programm. text file is something like this: a b c .. on each loop, program access file (using File Access block) and reads a new line "a" or "b" or "...
0
votes
2answers
118 views

Programming to get data

I am using EV3 with Linux V1.09 and I am doing a project in which I want to send the sensor data from the EV3 to a remote web server using POST method - is this possible?
3
votes
1answer
843 views

Is it possible to fix a broken EV3 Port?

I have an EV3 running RobotC version 4.55. The medium motor connected to Port A does not run, but if I connect it to another port (B,C,or D) it works. I tested it manually through the EV3 motor tab ...
1
vote
1answer
337 views

How can I build a compact EV3 gearbox?

I'm building a sumo bot in EV3 and would like to have both 1:1 and 1:3 gear ratios, with the first being useful for general driving and the second more for pushing other robots. My problem is, I ...
1
vote
0answers
25 views

Mindstorms nxt screen not lighting up [duplicate]

I just pickup up this set at a garage sale and put in new batteries. The initial start up noises were indicated and there are clicking noises but the screen is not lighting up. Is it broken or do I ...
0
votes
1answer
76 views

Bazooka blast ev3 Mindstorms using Python

I would like to shoot balls with the ev3 Lego robot. How can I code it using Python? Which components do I need for that and which function and motor use ?
0
votes
1answer
94 views

System.ArgumentException: Only Sequence Wires can be snapped

I try to open an project on last version of LEGO Mindstorm EV3 Home Edition, but the system shows the next error message 'An unexcpected error has ocurred. Please restart LEGO MINDSTORM EV3.' After ...
2
votes
1answer
1k views

What is the best option for Mindstorms EV3 remote control for motors?

I have never experimented with remote controlling EV3 but I wonder what is the best way to use it, especially in the case when I'd like to control large and medium motors parallel as well, possibly ...
0
votes
1answer
499 views

Moving the motor to certain initial position [duplicate]

I was assisting my child in EV3 missions, specifically, the 3rd mission of TRACK3R, the one where the robot has to grab two tires and put them elsewhere. The mission requires to manipulate the Medium ...
1
vote
2answers
285 views

Scroll screen in EV3 Home Edition program

I'm using LEGO Mindstorms EV3 Home Edition program to program my robot. Typically a program becomes wider than the screen. However, no horizontal scrollbars appear on screen. So how can I view and ...
4
votes
1answer
64 views

Does the Mindstorms RCX Input Ports have a Pull-Down Resistor?

Sorry for the strange question. I was wondering if anyone knew anything about the internals of the RCX mindstorms brick. Specifically, does it have a pull-down resistor (if no sensor is connected, ...
3
votes
1answer
3k views

EV3 Ultrasonic Sensor block is not availible in the Home Edition software

I can't find the ultrasonic sensor block on the programming app on my computer. I am using the Lego Mindstorms EV3 Home Edition.
1
vote
1answer
102 views

How to instruct EV3 to go a certain place in the room?

I'd like to instruct my LEGO Mindstorms EV3 robot navigate to a defined place in the room ("return home"). With the lack of GPS capabilities, what other possibilities exist? Maybe directing the ...
2
votes
2answers
515 views

Send variable to EV3 via WiFi

I'm trying to connect my EV3 via Wifi to my Unity game. Is there a simple way to send a command to the EV3? I gave the EV3 a fixed IP and I'm getting the broadcast which the device is sending. So ...
4
votes
2answers
730 views

LEGO Mindstorms Motor Power

I am working on a project with a LEGO Mindstorms (RCX) motor. For this project, all I need is to spin a motor (43362, http://www.philohome.com/motors/motor.htm). I was wondering how the LEGO ...
3
votes
3answers
4k views

LEGO Mindstorms 9797 (NXT Education base set) Software Download

Where I can download the Software for the LEGO Mindstorms 9797 (NXT Education base set)
3
votes
1answer
254 views

List of parts to buy for to “upgrade” existing Mindstorms NXT 1.0 to Mindstorms EV3 set?

Is there a list of parts available I need to buy to "upgrade" an existing Mindstorms NXT 1.0 (8527) set to a Mindstorms EV3 set?
7
votes
1answer
2k views

How do I export LEGO Mindstorms programs on the Chromebook

There is now a Chromebook app to program LEGO Mindstorms. I have multiple kids collaborating on programs for FIRST LEGO League. Can they share the program between their Chromebooks? I don't see a ...
1
vote
1answer
671 views

Mindstorms EV3 brick does not play sound file to the end

I have a 16 seconds WAV file and am trying to play it. It plays only the first 8 seconds both on the brick and on the Mindstorms programming software.
4
votes
3answers
428 views

Recreating Mindstorms TRACK3R test track

I didn't realize until now that the 31313 Mindstorms packaging secretly contains a hidden test track for the TRACK3R robot. And the packaging is long gone with the trash. D'oh! What is the simplest ...