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Questions tagged [electronics]

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4
votes
2answers
58 views

Stacking motors on the Powered Up hub or Boost hub

The way the Boost/Powered Up connectors are designed, it's not possible to have multiple motors on the same output of a hub like it was possible with 9V or Power functions. However, since I only want ...
4
votes
1answer
106 views

The route a power line takes through a neighborhood

I have a small Lego town built. I want to add power lines. However, I don't know how to route the power lines through the neighborhood. Should I create one line that snakes between all the houses? ...
8
votes
1answer
102 views

Classic 9V battery box current limiter?

Recently I disassembled a classic 4760c01 Electric 9V Battery Box Small Complete Assembly to see what was inside. Battery Box: Disassembled: In the switch component, we find what appears to be a ...
7
votes
1answer
374 views

Why are there 4 wires leading to the Power Functions LEGO train motor?

Does anyone know what the wires do? If the Power Functions train motors are simple DC only 2 wires would be needed or is it more complex than that?
3
votes
1answer
79 views

Is there a way to buy just the robotic parts?

I apologize if this is a silly question. My kids recently went to a Lego robotics workshop at our local science museum and LOVED it. Is there a way to buy just the robotic parts (motor, sensors, ...
6
votes
1answer
125 views

How to fix the 4.3V output supply of a NXT 2.0?

I have a Mindstorm NXT 2.0 from 2007 (PCB code: 62115.40H) at which the sensors except the simple "Touch sensor" are no longer working. Also the tacho-signal of the motors do no longer work. (The ...
6
votes
1answer
109 views

How could I provide power and/or data coupling between train cars?

I'm trying to find a way to create a power/data coupling between train cars that can be connected/disconnected like the car coupling magnets. Has anyone done anything like this? Background: This is ...
4
votes
1answer
1k views

Why is the LEGO IR Receiver V2 not widely produced? Or are they?

Basically, there are 2 different major versions of the LEGO IR Receiver, the unmarked V1 and the labeled V2. I've also read somewhere there was also a small hardware upgrade to the V1 Receiver at some ...
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, ...
7
votes
3answers
2k views

Running Power Functions Train Without IR Receiver/Remote

I recently bought 10254 Winter Holiday Train and wanted to get it running around the provided circle of track. I was wondering if there is any way to do this without incorporating the IR receiver and ...
4
votes
1answer
129 views

From what series is this brick?

We have ten of these, but I don't know from which series! When pressing the yellow button it makes a sound that could be a train or a tractor or something like that. We are curious. Does anyone know?
5
votes
3answers
441 views

Is it possible to build a decimal to binary converter (binary counter) with LEGO?

I have seen many papers on logic gates built with LEGO, but I want to make a decimal to binary converter. There should be a counter as an input, with each press of the counter, the output 8 block ...
1
vote
2answers
105 views

Conductive “App Brick” without human contact

This may not be entirely LEGO-related, but more related to touch screen technology. I'd like the LEGO app brick (http://brickset.com/sets/containing-part-6103777) to register a touch on a touch ...
8
votes
1answer
632 views

How much current do the LEGO motors draw?

I'm building a project with Raspberry Pi and some other electronics driving the LEGO Power Functions M-Motor (8883) and I need to know how much current those motors draw under load. Has anyone done ...
7
votes
1answer
433 views

Where can I get replacement cables of this kind?

What I'm looking for: This is a 4,5V cable which is part of an old set I once had. I don't have any parts number, but I know this comes in different lengths. Google told me about bricklink.com and I'...
6
votes
2answers
2k views

Custom Power Functions plug design

I'm considering the possibility of making my own Power Functions-compatible sockets for a project. I'm designing a module board for a single-board-computer with motor drivers and would like to encase ...
6
votes
2answers
2k views

What are the differences between NiMH and Alkaline batteries for the EV3?

Currently I am using six rechargeable batteries for my Lego Mindstorms EV3. A few seconds after I start a motor the EV3 gives a notification that that the battery is low. I know that good batteries ...
1
vote
0answers
82 views

Creating electronic product which is compatible with Lego brick [closed]

Currently, my company has an idea to create the product to integrate with your Lego brick. So far, we found that there is a product at kickstarter, mcookie (Link: https://www.kickstarter.com/...
3
votes
2answers
597 views

Identify brick with internal battery, light and sound

I just bought a bulk lot of second-hand bricks and found this odd one inside. It has a black panel on one side and when pressed it plays a screeching sound. Through the transparent purple top I can ...
3
votes
1answer
679 views

What is the correct input voltage for the 9v Lego train speed regulator?

I wanted to buy a transformer for the speed regulator, so based on this image, I bought a transformer with 12V DC output. It works. However, discussing this with a fellow AFOL, he pointed out that ...
12
votes
1answer
3k views

What are the electrical properties of electric LEGO systems?

Several electric LEGO systems exist: LEGO Trains LEGO Technic Power Functions (PF) LEGO Mindstorms (in several versions) ...? How do these systems differ in electrical properties and which systems ...
10
votes
2answers
4k views

Homemade methods for interfacing a Servo with LEGO bricks

I'm looking for non-destructive way to structurally attach a standard servo with LEGO bricks. I'm interested in answers for either Large, Medium or Small size servos. I'm using LEGO Mindstorm/...
6
votes
1answer
490 views

LEGO Scalextric?

I have a couple of these car parts in my collection but cannot find anything about them. They are copyright 2003 and show a number 3213 on the back axle. Interesting is that they have 3 electrical ...
12
votes
1answer
4k views

Can I use a generic (non-Lego) transformer with a rechargable Power Functions battery?

I've recently ordered a LEGO® 8878 Rechargeable Battery Box: I was wondering if I really need to get the (rather expensive) LEGO® Power Functions Transformer or if I can substitute a (cheaper) ...
16
votes
2answers
7k views

Is it possible to change the battery in a 54604 light brick?

I got 4 of these in in a bulk lot of Lego, but the lamp is getting quite dim in a couple of them. Is it possible to change the battery in a 54604 light brick? It looks like the brick should open, ...
55
votes
4answers
7k views

Is it possible to build simple logic gates with LEGO mechanics?

I built a simple bitshifter in Minecraft yesterday. I wondered if something like this could be built with LEGO? Maybe there is a possibility to build gates with rubber bands and those movable ...