3
votes
1answer
265 views

How can I use 1 motor for grabbing/lifting and another for moving?

I am really stuck on how to use the three motors for better functions. Is there anyway in which I can use 1 motor for efficient/quick movement while turning left and right? Another thing is whether I ...
3
votes
1answer
3k views

Where can I download the software for old RCX-era Mindstorms sets?

These days I've been coming across a lot of people who've purchased used MINDSTORMS sets from the RCX era, only to find they didn't come with a CD. And in order to use the set, assuming that using an ...
3
votes
1answer
149 views

Lego 7670 has two different box designs?

Does Lego 7670 (Hailfire Droid and Spider Droid) have two different colored boxes? I am seeing two different boxes on Ebay and other sites. One is a white clone wars box, and the other is a dark red ...
3
votes
1answer
84 views

CAD model of the LEGO monorails

I was wondering two things, Is it legal to share CAD models of LEGOs with other people as long as it is not for profit and Does anyone have A CAD model of the LEGO monorail track that was made in the ...
3
votes
1answer
105 views

How do they keep the outdoor models so clean at the various Legoland parks?

I've visited Legoland in California a few times and was always impressed with the lack of accumulated grime or bird "strikes" on the outdoor displays. How do the park employees accomplish this feat? ...
3
votes
2answers
420 views

IDE recommendations for EV3 programming

Does anybody have any recommendations for non-GUI programming of the EV3 unit? I'm impressed by the LabVIEW software, but as a professional C# and VB.Net programmer (with C, C++ experience), I find ...
3
votes
1answer
188 views

what is included lego 7155

I found an open box lego 7155 at a local Goodwill. The funny thing is that there are 3 unopened bags in the box, 3 booklets (instructions, and 2 other small booklets along with 4 large pieces that ...
3
votes
1answer
150 views

Best online community for Lego Builders?

It seems like different people use different online communities to share Lego-related things, but is there one that's just the best? I suppose I am asking a subjective question, but what I'm looking ...
3
votes
1answer
126 views

Finding certain positions in a room?

I have LEGO NXT and a square room of 100x100cm. I would like to use the center of the of the room always as my starting point(the black box). The green box is going to be my park area. Circles can be ...
3
votes
1answer
114 views

Battery Acid Dust Issue

I was recently digging through some old boxes looking for old LEGO bricks I had as a kid. In two of the boxes I found old double A batteries that had busted (the boxes were in a building that has got ...
3
votes
1answer
398 views

How to use two NXT bricks for 3+ motors and 4+ sensors?

I need to use multiple bricks in order to use more motors and sensors. I need to read sensor values, and tell motors to move. I've tried using bluetooth, however my attempts haven't been very ...
3
votes
1answer
166 views

Are there any LEGO elements not being produced because of mechanical problem with the mould?

I am referring element number 702 4x4 corner brick, and possibly other elements that have not been in sets in a considerable amount of time.
3
votes
1answer
1k views

On Lego Mindstorms EV3, is there a way to change the input parameters of a My Block?

I am writing a program for which I did a My Block. I later realize that I need to add a new input parameter and I can't find a way of doing this without creating a new My Block. This seems it should ...
3
votes
1answer
1k views

Software to do Duplo train track layout?

Anyone know a way to create with a software duplo train track layout? The only thing I found is: http://www.anyrail.com/index_en.html It's a bit overkill for what I need and it's $US60, although ...
3
votes
1answer
691 views

Can I open my old NXT program files in the new EV3 software so I don't have to rewrite the entire program?

I would like to use or convert NXT-G 2.0 programs for use with the new EV3 software. Is there an easy way to convert them besides just building them from scratch in the EV3 environment?
3
votes
1answer
174 views

What pieces do I need to make suit swappers from the Lego Batman video game?

My son has asked Santa to bring him Lego Batman suit swappers to use with his minifigures, both Batman and Robin versions. Can anyone advise as to what pieces are needed for these? All help is very ...
3
votes
2answers
509 views

Suspension bridge building techniques

I am working on a suspension bridge with my sons and have encountered two problems. Our technique: 8x6 plates for the roadway 1x8 bricks (with side-holes) underneath each side of the roadway to ...
3
votes
2answers
1k views

Unable to connect to NXT using NeXTTool via USB cable

For reasons beyond me, the NXC program MotorControl22.rxe in my NXT has disapeared. So i thought I'd just download it from my computer over to the NXT using NeXTTool. This is where the trouble ...
3
votes
1answer
304 views

How to store large amounts of bigger bricks?

I am aware of this question and of this post blog on Evil Mad Scientist which include a couple of interesting. My issue with the first one is that it is completely unsuitable for larger amounts of ...
3
votes
1answer
2k views

Naming a program in EV3 software?

I have figured out how name a project but cannot figure out how to rename a program.
3
votes
1answer
795 views

EV3 digital interface with sensors?

The EV3 Brick is noted as having both analog and a higher speed digital I/O with auto ID up to 460.8 Kbit/s (UART), and 4 motor port with encoders. The NXT Brick has 4 sensor ports both Analog and ...
3
votes
1answer
5k views

Where can I buy older sets, such as the 10187 VW Beetle?

A few years ago LEGO issued a wonderful set of a classic 1960 Volkswagen Beetle, for an selling price of $120. A few years have past and I can't find it anywhere except on eBay where it is sold for ...
3
votes
1answer
156 views

Setting priorities in LEGO NXT Programmer

For a sumo bot competition I made a robot that has a perfectly functioning ultrasonic senor. However, when I made a second branch on the program for a light sensor, I calibrated the light sensor and ...
3
votes
1answer
56 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 ...
3
votes
1answer
40 views

NXT brick not executing programs correctly

I have an issue that I am hoping someone might be able to resolve: We're using Mindstorms in the classroom as part of a STEM program and have one NXT brick that wont execute programs correctly. The ...
3
votes
1answer
76 views

How can I tell if my NXT motor is faulty?

I pulled my old Mindstorms NXT out of storage (it's been there for a few years). After patching together a test robot, I noticed that my motors behave strangely. At first, one of the motors did not ...
3
votes
3answers
120 views

Cheap Lego sets for Kindergarten classroom?

I am wondering what is the best way to get a set of Lego bricks for my kindergarten classroom? The children love playing with them and I no longer own them due to a transfer of grade levels.
3
votes
2answers
360 views

Return a robot to its start position?

I have a LEGO NXT robot, and after some movements I would like it to return back where it started. After some research, it looks like my best option is to revert the motors. To decode their movements ...
3
votes
1answer
152 views

Which bricks warrant an extra to be included in a set?

I know why there are extra pieces in the sets, but I'm curious to find out which pieces will typically have an extra. I know that usually 1x1 plates (both square and round) will have an extra ...
3
votes
0answers
48 views

What electrical contact material is used for PF Connectors?

I'm designing my own PF electrical connector and I want to have the same functional characteristics as the original Lego brick. Could you please let me know which electrical contact material is ...
3
votes
0answers
48 views

PC To NXT Brick via Bluetooth

We have a fully-working java programme which can connect to another computer and can send messages from this(both sides run java and we used SPP Server and Client), however when trying to connect to ...
3
votes
1answer
714 views

How do I get the Mindstorm EV3 software to recognize an NXT brick via Bluetooth?

I'm trying to program my NXT brick via the EV3 software over a Bluetooth connection. I can connect it via USB (although that too failed initially but has since resolved; not sure why) but I'd really ...
3
votes
0answers
206 views

LEGO turing machine using Rascal

I followed the instructions on LEGO Turing Machine and succeeded to build it. Next I've tried and failed to program it using NXT Mindstorm GUI. The site mentions a Rascal framework, but it doesn't ...
3
votes
0answers
145 views

NXT shuts down in 5 minutes

I have an NXT brick that will always shut down after 5 minutes. No, it is not the sleep timer. Documentation from the NXT Hardware SDK, page 17, states that if the ARM7 processor does not send back ...
3
votes
0answers
95 views

Cleaning lego: substances that can be safely used without causing damage? [duplicate]

Possible Duplicate: Lego cleaning techniques and tools I've used a normal washing up solution of Fairy washing up liquid and warm water to good effect previously, but I do find the blocks ...
2
votes
4answers
606 views

How to put LEGO together upside down

I'm building a truck. For the transmission, I want to make it all even and symmetrical. To do that I need the pieces to stay together but they have no studs connecting so they will just fall apart. ...
2
votes
2answers
236 views

How can I make a pigglet headed LEGO figure to be a sidekick for my Gadget Hero?

I have a LEGO superhero that I painted, and he needs a sidekick. The Sidekick is a boy who has the head of a pigglet! But how do I make a Pigglet head?!?
2
votes
1answer
395 views

Please identify this broken LEGO Technic piece

This piece is from LEGO Technic 8070 Super Car. Can anyone please identify its name as it's broken and I need to get a new one.
2
votes
2answers
941 views

What is LEGO Junior?

Are LEGO Junior bricks bigger than regular LEGO? I can't decide between Junior LEGO and Duplo for my son who is just over 3. I had thought the Junior sets might constitute a happy medium, but am now ...
2
votes
2answers
203 views

Identify minifigure torso - yellow with blue “N” on front

I've got a yellow torso (with yellow arms). The front (I believe) has a large blue letter 'N' with a orange drop shadow. Otherwise the torso is plain. I've tried loads of search terms on bricklink to ...
2
votes
2answers
275 views

Where did “Cheese Slope” get its name?

Why is this piece called a "cheese slope"? "Slope" I get; but "cheese"?
2
votes
2answers
354 views

Pick A Brick delivery times

I am about to order some bricks using the online Pick A Brick service. Unfortunately, its delivery time information is confusing. In the right column of the checkout page, it says: Your item will ...
2
votes
2answers
805 views

What's a good base collection of tiles?

I recently picked up a copy of the LEGO ideas book, and been inspired. As a novice builder, I've noticed that almost every model makes use of tiles to provide a finished look, which seems like a great ...
2
votes
3answers
210 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 ...
2
votes
2answers
143 views

Part Identification - bricks with posts

I have two unusual lego pieces that came from a collection of used legos that mostly seem to date from the 1970's that I am unable to identify using LDraw's ldfind app. What are these parts, and if ...
2
votes
1answer
484 views

Cost of different works in a LEGO set price?

What percentage of a LEGO set's price goes toward research, design, manufacturing, marketing etc. It's just my curiosity since all my minifigures (from Series 3) are made in China and I don't know if ...
2
votes
3answers
601 views

Authentic or Not?

I browse periodically on eBay and see a lot of superhero lego minfigs. Are these real or Chinese knockoffs? It says that they're from China. I just search "lego minifigures". ...
2
votes
1answer
364 views

Robot that builds a copy of itself

I'd like to try building a robot that can build a copy of itself. Basically, I guess that involves: having some means of navigating around (i.e. wheels, tracks, something to move on) having some ...
2
votes
1answer
2k views

What different types of lego train tracks exist?

I would like to purchase some used lego train tracks off ebay. I am not, however, very familiar with the different choices of track systems are out there that I might come across. So I would like to ...
2
votes
1answer
1k views

How to build a flywheel crankshaft piston pattern with technic?

I'm not sure of the name of the pattern, feel free to edit title if you have a better name for the pattern commonly used in engines. I was just wondering if anyone has built this specific pattern in ...

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