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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.

1
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2answers
36 views

Color sensor reliable?

I am experimenting with the light sensor shipped within the mindstorms ev3 package. My Problem is that the bot is standing quiet at one place. Each value returned by sensor is different, although the ...
2
votes
1answer
46 views

Two motors are driven forward, why are they rotating in different directions?

I have the Lego Mindstorms EV3 Pack and built a simple car with 3 wheels. The back whels are motorized. When I run the following code: Motor.A.backward(); Motor.D.Backward(); both motors are ...
0
votes
0answers
27 views

EV3 Spinner factory not moving in the right order

We've built a spinner factory going by the original instructions in the Lego Mindstorms EV3 Education Software, and downloaded the program for it onto the bricks, the Spinner factory moves around, the ...
3
votes
1answer
47 views

What do I need to connect an old RCX2.0 to a computer and is it worth compared to just buying a new one?

From a friend I got some Lego, including an old Mindstorms package (RCX 2.0 as I already found out). It's my first time with the Mindstorms "eco system". I already found out that I need some kind of ...
3
votes
2answers
90 views

What does each part do exactly?

It's been a few years since I bought a Lego Mindstorms (v2) which comes with the technic style pieces. There's beams, axels, rods, connectors... but the majority of the times when I'm building (my ...
4
votes
1answer
235 views

How to install Firmware 1.10E on an EV3 home/retail edition brick

If and how can you install firmware 1.10E on an EV3 brick from an home/retail edition set (instead of an education set)? Updates 1.0E9 are only recognized from the Mindstorm software, also with ...
3
votes
0answers
87 views

Capture video stream from LEGO Studio Camera (Logitech USB webcam) in ev3dev?

Once upon a time, LEGO made a digital camera for the LEGO Studios and Mindstorms line. Internally it's an old USB Logitech repackaged in a LEGO housing. It could also be used with the old LEGO ...
4
votes
2answers
97 views

What are some good purist rotacaster / omni wheel designs?

In robotics, rotacasters or omni wheels are often very useful. It's possible to buy LEGO-compatible ones from some third parties, here's one random example: Unfortunately, LEGO has yet to make any ...
2
votes
0answers
212 views

Lego EV3 simulator and programming

I've been searching and testing for hours. There is little information on this subject though. I have some specific requirements for a Lego EV3 simulator and programming environment. I do not want to ...
4
votes
1answer
142 views

Mindstorms Chromebook app Stuck in Zoomed-Out Position

We are using the LEGO Mindstorms app on Chromebooks. Our test program got zoomed-out to the point of being too small to read. The remainder of the screen is normal sized. We've tried using 2 fingers ...
1
vote
1answer
97 views

Program for NXT golf robot not looping properly

This is what I made: I will put this robot straight in line with the ball I have to make this robot go forward and once it reaches the ball, I have to make it stop and hit the ball with the swing ...
0
votes
1answer
65 views

How could I make a golf robot from a LEGO NXT kit?

I want to make a golf robot. It will be placed straight in line with the ball. It will approach the ball and swing. The part where I get confused is how to get it to swing in a left-right motion when ...
3
votes
0answers
73 views

EV3 Brick and Commander app bluetooth disconnecting

On OSX on an iPad, we're having an issue with the EV3 Brick and Commander app bluetooth connection constantly disconnecting. The brick just stops responding, so we turn the brick off to disconnect and ...
2
votes
2answers
56 views

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 ...
7
votes
3answers
2k 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 ...
3
votes
1answer
64 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
101 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
133 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
vote
2answers
179 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
297 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
64 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
297 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
votes
1answer
596 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 ...
3
votes
2answers
238 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
votes
2answers
185 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
vote
0answers
139 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
117 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
359 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
390 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
votes
2answers
211 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
570 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
3answers
2k 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
637 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
vote
0answers
112 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
663 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
524 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
54 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
361 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
168 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
487 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
112 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
622 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
270 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 ...
1
vote
0answers
237 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
211 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
135 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
1k 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
456 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
27 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
98 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 ?