Questions tagged [electronics]

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5
votes
1answer
253 views

What is this 11x6 white and dark grey motorized LEGO piece with blue buttons and a transparent blue panel?

My brother bought a big tub of LEGO recently and found this piece inside. He doesn't know what it is and we can't find anything about it online so we were wondering what it is. He says it isn't in any ...
10
votes
1answer
352 views

Replace Battery in LEGO Dino Attack Light-Up T-Rex Head?

Is it possible to replace the battery of the LEGO Dino Attack T-Rex head? There's a button on the top of the head that makes the eyes and tongue light up red, presumably via a red LED. There doesn't ...
4
votes
1answer
164 views

From what series is this brick? Duplo machine piece with yellow button, copyright 2007

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
1answer
204 views

What is this silver and transparent green electronic piece for / from

I found this Lego in a box with other old Lego parts and I have no idea what it is for. It has a 'Lego' logo with a code 5202 but I can not find anything online. Could someone please give me more ...
4
votes
2answers
933 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 ...
8
votes
1answer
251 views

Duplo Locomotive: What is this inner part used for?

Background I was forced to completely disassemble a duplo locomotive. My son played with it in a sand box and, guess what, it was not working anymore. I used a small brush to clean every single part (...
1
vote
1answer
105 views

IR protocol for Duplo RC Dozer (2949)

Does anyone know where to find the IR protocol for Duplo RC Dozer (2949)? I have the RC Dozer and no remote and wanted to use a universal remote to control it.
7
votes
1answer
167 views

AA Battery Packs 54950c01 vs 59510c01

What is the difference between these two battery boxes, 54950c01: and 59510c01: except for the on/off button? Which electrical connectors are compatible with each of those? Is there a counterpart ...
3
votes
1answer
113 views

What sets are these electrical parts from, dark grey bases and remotes with orange and yellow buttons?

I have been searching for a long time but I am struggling to find the origin for these parts. I think they are possibly Power Functions IR remotes & battery packs...? Thanks for any help.
1
vote
0answers
93 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
3k views

How do I make a remote control car without LEGO motors?

I have no LEGO motors In my collection, what are some household materials I can use?
18
votes
3answers
7k views

Lego set for 17 year old

This might sound a little bit silly, but I'm 17 and I've never built a LEGO toy, so I was looking for a first one, to see what it's about. What sets would you recommend I should look at, that are ...
5
votes
1answer
332 views

Apart from the LEGO brick, is there any other hardware that has an NXT firmware written for it?

I am trying to find out if you can upload LEGO NXT byte-code to any other hardware, so I am just checking to see if anyone has ever written the LEGO firmware for any other hardware. Maybe hardware ...
1
vote
1answer
1k views

EV3 IR, ultrasonic senosor datasheets

I want to connect EV3 IR and ultrasonic sensors to my Arduino. Unfortunately could not find any good documents describing how to use/control them. Could you please help? Thank you very much.
-1
votes
1answer
369 views

Arduino-izing LEGO Technic - and now I need some ideas for the Lego Service Truck 8071

I am starting a project - Arduino-izing LEGO Technic - and now I need some ideas for a car / vehicle to choose. This project starts out as a quest to find a way to combine the ease of LEGO Technic ...
7
votes
2answers
2k views

Is the PWM on the PF Servo motor different than the PWM from an Arduino?

I have a Arduino motor shield connected to XL, L and M motors and can control the speed with PWM (Pulse Width Modulation). I made my own connector by cutting a Lego PF connector in half and wiring up ...
3
votes
1answer
416 views

Control two Lego NXTs with an Arduino

I'm new here and also very noob with the Arduino. I have a basic knowledge in Java and some more in C# so code isn't a problem. I can learn it easily. I have a project assigned. I would like to know ...
2
votes
1answer
827 views

LEGO EV3 I2C Compatibility

I'm having difficulties with communication between the EV3 and Arduino boards. Does anyone know if the EV3 is really I2C compatible, or is it just close enough? Background: I can get the EV3 to ...
2
votes
3answers
514 views

Bucket Wheel Excavator not powering up?

I just finished to assemble the Bucket Wheel Excavator (42055) set, I inserted new batteries in the battery box and tried to power it up. The LED on the battery box blinks for a millisecond almost ...
1
vote
1answer
102 views

My DUPLO railroad engine stops after 20cm

My DUPLO railroad engine stops after 20cm moving. I suppose the sensor in the front axle is damaged. So is it possible to repair it?
3
votes
2answers
607 views

Repairing disintegrated old 9V wire

I have a number of old technic motors and battery boxes I would like to use however the wires have disintegrated in storage to the point that the metal conductors touch and short out. Does anybody ...
5
votes
1answer
257 views

Are there any difference between the Power Functions 88003 and 99499 L motors?

I am planning to attempt a couple of RC MOCs and was looking up the power functions L motor on BL and found that there are actually 2 types of the L motor, namely the "88003 Power Functions L Motor" ...
5
votes
3answers
3k views

Which programming environments or APIs are available for the LEGO BOOST?

Over the holidays I tried the following Python library: https://github.com/undera/pylgbst but I couldn't get it to work. Then again my knowledge of Python is very limited. I'm more experienced with C+...
3
votes
1answer
221 views

Problem-shooting on 8070 “Super Car” with Power Functions

I have recently bought a used Lego Technic car (8070 Supercar). It was not fully built, and from the instructions I learned that it was fully built except for approximately the last 10 steps. I ...
0
votes
2answers
122 views

Scarcity of electric parts: motors etc

Having bought parts in bulk several times I came to realization that electric parts are scarce resource in Lego world. The cost of plastic parts comes at around 10% of original price but there are so ...
6
votes
2answers
307 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 ...
3
votes
1answer
51 views

Use D output in 42099 (4X4 X-treme Off-Roader) set

How I can use the D output for an additional motor in the 42099 set? Or how can I use a custom control skin?
6
votes
1answer
604 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 ...
1
vote
1answer
41 views

Can a v1 PF reciever power an XL motor and servo?

I have a v1 PF receiver but don't want to pay $35 for a v2 receiver and I was wondering if a v1 receiver can power a single XL/L motor and a servo.
1
vote
0answers
54 views

Custom extension cables for Light Stax?

Recently, I got the S-12012 Light Stax kit with 50 (!) light bricks. They are different from those described in this question, but they are much cheaper, colorful and with blinking/pulsating effects. ...
5
votes
2answers
568 views

What is a good third party battery box and receiver?

I got the LEGO 4x4 crawler for my birthday and I love it. But there is one slight thing which I hate: it has terrible range when using it outside. I know there is BuWizz which is a third party ...
14
votes
1answer
5k 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) ...
5
votes
2answers
481 views

Arduino-izing LEGO Technic - ideas for a car / vehicle to choose

I am starting a project - Arduino-izing LEGO Technic - and now I need some ideas for a car / vehicle to choose. This project starts out as a quest to find a way to combine the ease of LEGO Technic ...
5
votes
1answer
99 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, ...
5
votes
2answers
327 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 ...
3
votes
1answer
944 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 ...
4
votes
1answer
120 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? ...
14
votes
1answer
4k 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 ...
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 ...
8
votes
1answer
227 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 ...
19
votes
2answers
8k 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, ...
8
votes
1answer
1k 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?
8
votes
3answers
3k 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
4k 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 ...
5
votes
3answers
526 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 ...
5
votes
1answer
133 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 ...
7
votes
2answers
3k 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 ...
3
votes
1answer
101 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
1answer
562 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'...
60
votes
4answers
9k 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 ...