2
votes
1answer
19 views

Software to help inventory set

Are there any software applications to help check the inventory of a lego set? Currently I load the set-up as a bricklink wanted list and then delete each part one by one until I have only the ...
17
votes
5answers
2k views

Useful machines built with LEGO

I am looking for examples of useful machines built with LEGO (probably Technics, NXT etc.). There are many fun project examples and proofs of concept, such as a Rubik cube solver and a Turing machine. ...
1
vote
1answer
21 views

MRDS & RCX Support?

What is the last version of the Microsoft Robotics Developer Studio that supports the RCX? The Wikipedia link (http://en.wikipedia.org/wiki/Microsoft_Robotics_Developer_Studio) indicates RCX was ...
2
votes
1answer
36 views

I need a block that can combine a movement program with NXTbee radio

I am a student. I am working on a science project using LEGO Mindstorms robots enhanced with NXTbees creating a mesh network. My engineering mentor has me using LabVIEW. I am trying to find a block ...
1
vote
0answers
24 views

Block Platform parameter is not instanciated

I used Simulink to write a program for LEGO Midstorms NXT. I can post the design if needed. The problem is that when I want to run it on hardware, it gives the following error: Lego mindstorms NXT ...
1
vote
0answers
176 views

Linear Actuator of the boom of 42006 jams

I just built a 42006 excavator, and the Linear Actuator jams such that it can't be rotated. I think that the overly sharp angle of the u-joint at the top of the boom is the reason. Is there a ...
1
vote
0answers
32 views

Tufts MAZE LabView Program Will Not Run on EV3

Through the 2012 LabVIEW for LEGO software package, I found an example of a maze from Tufts. I cannot get it to run on an EV3. It appears to just constantly execute the initialization. How can I ...
1
vote
0answers
33 views

RCX + java + usb-to-serial

I am trying to get an old RCX working with leJOS. I already have it working with NQC and BricxCC. While NCQ/BricxCC seems to recognize my usb-to-serial (which appears as "COM5" to the OS), the leJOS ...
1
vote
1answer
183 views

Dimensions for EV3pieces

I need to know the dimensions of the EV3 pieces for a school project (in mm). Does anyone know?
1
vote
2answers
30 views

Which wheels are suitable for Power Functions M-Motor

I'm attempting to build a small self-propelled LEGO robot. Initially I was attempting to use some cheap DC hobby motors but I spent a lot of time trying to attach LEGO wheels to the motor's 3mm ...
0
votes
1answer
144 views

Can Mindstorms EV3 communicate using protocol 802.15.4?

My aim is to make the robot communicate using protocol 802.15.4 through a USB dongle 802.15.4 over 6LoWPAN. The robot has to be able to get information from TelosB. I wonder whether this possibility ...
1
vote
0answers
15 views

Access WeDo on OS X from a real programming language

I'm trying to talk to the WeDo USB interface from Python or really any real programming language. I tried the clever WeDoMore library, but can't get it to bind the WeDo. I think this is because the ...
3
votes
2answers
45 views

Is there a list of giveaway sets from Toys R Us or other events?

Toys R Us frequently has giveaway sets called "Make and Take", where kids are invited to come in, build a set and then take it home for free. This is similar to the Lego Brand Retail store Monthly ...
1
vote
1answer
39 views

Bluetooth communication between computer and nxt using RobotC

I'm thinking starting a project involving controlling the movement of a NXT robot from the PC using RobotC. Is it possible? Does anyone have a simple code solution?
2
votes
0answers
47 views

How much does an average LEGO brick cost to produce?

I know that LEGO bricks approximately sell for 10 cents per piece but what does it cost to make an average brick?
0
votes
1answer
105 views

Raw RGB data to Color?

I'm trying to convert the raw RGB values from a Colour Sensor into HSL but it doesn't seem to be working: R = rgbn[INPUT_RED]; G = rgbn[INPUT_GREEN]; B = rgbn[INPUT_BLUE]; var_R = ( R/255 ); var_G = ...
35
votes
12answers
50k views

What's the most cost effective and efficient way to buy bricks?

After a 20 year hiatus I picked up LEGO again as a hobby. I've been into the Trains lately and need bricks. I found a couple places to pick them up but they all suck for various reasons. The first was ...
3
votes
1answer
117 views

Does knolling help or is it just part of the fun?

When building a new set, many people knoll their LEGO bricks before beginning the assembly. My question is: Is there a actual advantage to knolling all the pieces or is it only a way to stretch the ...
2
votes
1answer
41 views

Could I do datalogging in Mindstorms EV3 Home edition?

Apparently datalogging is an integrated part of the educational EV3 software. But I got the Home edition. Is there some module or thing I can use to get datalogging functionality in my Home edition? ...
0
votes
0answers
63 views

RGB To HSL Algorithm? [migrated]

I have seen many algorithms and formulas for converting RGB data to HSL but none were successful. So where can I get few algorithms/formulas for converting.
0
votes
0answers
61 views

Do you use the plastic buckets for purposes other than organizing your bricks?

We have several bucket sets like #5560. Now that our collection is growing, it's becoming harder to find what we need in the buckets even though we have them sorted by color. Plus they are in a ...
1
vote
1answer
97 views

Connection between two NXT bricks

Is it possible send information from BrickNXT_A to BrickNXTB_B? For example I have a touch sensor connected to IN_1 of Brick_A and I want send the result of the sensor status (1 or 0) to Brick_B. If ...
5
votes
1answer
41 views

What is NXT-G number format?

We've been following this tutorial to connect a NXT 1.0 brick to a PC via Bluetooth. We've been able to set up the communication, send and receive data in ASCII format. However, whenever we try to ...
1
vote
1answer
59 views

Mindstorm EV3 no longer recognises SD card

I followed the instructions to install leJOS on an SD card, to get Java support for the Mindstorms EV3 brio. The brick detected the leJOS files and processed the whole installation procedure ...
1
vote
1answer
54 views

Can I identify the colour of objects 5mm in diamater with an EV3 Colour sensor?

My plan was to make a simple robot to sort beads like this:. Its the Hama Medium size beads, they have a diameter of 5mm so they are fairly small. After some testing, reading and asking here I figured ...
3
votes
1answer
59 views

Custom EV3 Block: “Unable to compile…” (“string subsection”)

I am attempting to make a custom block according to the EV3 Block Developer kit (found here). I was able to create a simple block that returns the length of a string. This is what it looks like: (The ...
13
votes
2answers
4k views

What is this Lego piece - Yellow with handles and an octagonal section?

It clearly says Lego on it, but I have no idea what it is. The only number inside is 4-01.
1
vote
2answers
217 views

How to find out which set contains a higher plate percentage?

I want to gather various types/colors of plates to do some mini model MOCs. How can I find out which set has the best plate percentage or price per plate pieces? I know there are a lot of ways to ...
2
votes
3answers
230 views

Lego remote controlled cargo train not working

I've helped my son put together the Cargo Train set (60052) but now we can't get the remote control to work. It all looks like it's been assembled correctly with new batteries put in, but it doesn't ...
5
votes
1answer
233 views

How to get good color readings from the color sensor?

What type of setup is needed to get good color readings from the Mindstorms EV3 color sensor: Shape of object? Size of object? Distance to object? Color of background?
2
votes
3answers
572 views

Creating a native EV3B block

I'm trying to create a native block for a hardware sensor. I've got it working pretty well, but can't get it to show up in the "port view" as anything but a sound sensor. I really need the live view ...
2
votes
1answer
93 views

How can I rotate an EV3 motor an exact number of degrees using RobotC?

I'm trying to rotate the motor of an EV3 by an angle of 50°. I can't. How I can rotate a NXT/EV3 motor by a given angle using RobotC?
2
votes
1answer
186 views

Need help identifying extra large Lego figure from 2003

I came across these LEGO figures at an estate sale and have had no luck trying to find out what they are called. They are much larger than a regular minifig but have a shaped foot plate to attach to ...
10
votes
1answer
2k views

What would be a simple trebuchet design at the Minifigure scale?

I would like to have a trebuchet design at the Minifigure scale and simple enough for kids 10+ to build. Note 1: The counter weight can be any non-LEGO heavy object. Note 2: On top of the standard ...
1
vote
1answer
48 views

How would I make a decal for a 2x2 dome brick or a 2x2 round slope brick?

I am looking to make a decal for a custom droid using either the R5-series head or the regular dome R2/R3/R6/R7/R8 head. However, I do not know the process for creating droids. Does anybody know how?
2
votes
1answer
35 views

How to import an unofficial parts archive into LDraw?

I recently created a basic EV3 robot in Lego Digital Designer and exported it as a LDraw file. When I opened the LDView file, the EV3 elements were missing. I then proceeded to download an unofficial ...
4
votes
1answer
374 views

Dimensions of Mindstorms NXT pieces

I don't have access to my NXT boxes at the moment (they're stuck behind a wardrobe that won't get moved for a week or so) and I'm working on this project where I need to know the dimensions of the ...
2
votes
2answers
81 views

NXT Motors curving to the right

The NXT motors have been curving to the right by about 10-20 degrees. We have checked the program, no curves. We have checked the wiring, but it is also plugged in fine.
2
votes
1answer
124 views

EV3 RMIregulatedMotor Regulation Problems

I have problem with regulation of the motor when I control EV3 with Bluetooth. Here is the code: RemoteEV3 ev3 = new RemoteEV3("10.0.1.1"); ev3.setDefault(); RMIRegulatedMotor leftMotor = ...
4
votes
1answer
78 views

How large is the face of a 2x2 45º brick?

I am attempting to make a decal for a roof tile, sort of like the computer face on certain bricks of the type. However, as there appears to be no template, how large is the face of a 2x2 45º brick?
7
votes
1answer
511 views

What is the true angle of a cheese slope?

What is the true angle of a cheese slope? Bricklink lists it as "Slope 30 1 x 1 x 2/3" while LDraw and Peeron list it as "Slope Brick 31 1 x 1 x 2/3". Why do these sources disagree, and what is the ...
12
votes
9answers
3k views

My poor minifig's head is stuck in his helmet!

Recently I made a LEGO race car with a driver who wore a helmet. Unfortunately, after the race, I tried to take off his helmet and his head came off inside the helmet. Any suggestions about getting it ...
0
votes
1answer
36 views

Connect 39k3 powerpack to 417j3 motor

I'm new to lego. Trying to connect the powerpack 39k3 from 42009 Crane to a 417j3 motor. Is a 8528 Converter Cables for Mindstorms NXT the right cable? Is there a way to hack a phone connector ...
2
votes
1answer
46 views

Have Multiple Inputs to Programming Block

Originally, I had a simple program to move until the robot hit a wall, then it reversed and turned and moved again, repeated to infinity. It works by turning the motors on, waiting for input from the ...
16
votes
14answers
3k views

What pieces are prone to breaking?

I've had a few pieces break over the years, which was a real bummer as I was not expecting them to. What are some commonly used pieces that are prone to breaking? Pieces that should be handled ...
10
votes
2answers
3k views

Removing glue from Lego bricks

When I was five my Dad used some kind of a good glue to put together a set together so I didn't loose any pieces. Putting the ethics of that action aside, I want to split the bricks from another and ...
8
votes
1answer
130 views

Trains overview image

I'm looking for an overview image of all trains ever released by LEGO. With trains I mean train sets containing locomotives and wagons that run on train tracks. There is a beautiful image from Jeroen ...
2
votes
1answer
229 views

Mindstorms EV3 PC application won't load

Installed Mindstorms EV3 application on MS Windows 7 Home Premium v6.1 (Build 7601: Service Pack 1) and I keep getting the same error message when launching. A white window pops up with the ...
1
vote
0answers
65 views

Why are there only four elemental artefacts? [closed]

What I mean by this is that there are only 4 golden weapons (Fire, lightning, earth and ice), 4 elemental weapons (the same elements), 4 elemental forges (the same ones) 4 obsidian weapons (again!). ...
1
vote
1answer
115 views

What Lego set does this belong to?

I want to find which LEGO set this unusual piece belongs to. I have 10? I have a few sets from the late 1980's and the rest are from the 1990's. I have looked and looked. Hope you can help! It ...

15 30 50 per page