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Questions tagged [electronics]

Electronics are the branch of physics and technology concerned with the design of circuits using transistors and microchips, and with the behavior and movement of electrons in a semiconductor, conductor, vacuum, or gas.

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6 votes
1 answer
1k views

Continuous power supply for the SPIKE Prime or Robot Inventor hubs?

The hubs present in the Mindstorms Robot Inventor or SPIKE Prime sets have 2100mAh lithium-ion batteries which can be charged with the accompanied cable with a micro USB connector on one end and a ...
11 votes
3 answers
7k views

How to run "Power Functions" devices from an electric wall plug?

In this video showing an example of Great Ball Contraption (GBC), we can see (at 1:35) that some train's powers are used to run Power Functions (PF) motors: That must be more convenient than having ...
11 votes
1 answer
2k views

How are the sounds from the Sorting Hat produced?

I've seen the Talking Sorting Hat set: How are the sounds for this hat produced? Could it be used to produce other sounds?
0 votes
0 answers
24 views

How to connect NXT brick to EV3 programming software for mac (2024) [duplicate]

I have an NXT brick (most likely from 2006 based on a newspaper clipping I found in the box) that I want to program the NXT brick with the EV3 programming software (the newer version of the EV3 app ...
1 vote
0 answers
81 views

Is there any way to use electric pieces in Stud.io?

Also is the stack exchange meant for digital LEGO editors like Stud.io?
3 votes
1 answer
169 views

Type of Battery connector of Spike Prime & essential Hub

What is the type of the 3-pin connector used to connect the Spike Prime Hub or Spike Essential Hub to the rechargeable battery? It consists of 3 pins and has a male and a female side. I have issues in ...
5 votes
1 answer
199 views

Electronic inside Spike Ultrasonic Sensor 45604

What is inside the Spike Ultrasonic Sensor 45604? Pictures of Top&Bottom PCB-Assembly would be helpful. PoweredUp Cable and Connector use 6-Pin, but why is there used 8-Pin connector inside "...
19 votes
2 answers
12k 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, ...
4 votes
2 answers
302 views

Does LEGO make a electronically controlled pneumatic valve bank?

I've decided to try my hand at building a working LEGO Concrete Block Making Machine, as shown in this picture: with the idea being that the machine will be controlled by both manual and automatic ...
1 vote
0 answers
47 views

How to fix torn EV3 LCD Cable [duplicate]

I accidentally tore my lego EV3's LCD ribbon cable while opening it. I found this post of someone a while back having the same issue, however as my tear is smaller I was wondering if it was possible ...
3 votes
0 answers
317 views

LEGO Studios Movie Maker Camera (1349) (2000)

A few months back I had purchased the LEGO Studios Movie Maker Set (1349) and have been tampering with it, specifically the camera, to see if I can get it to work on my Windows 11 laptop. Was able to ...
2 votes
1 answer
242 views

What electronics are inside the SPIKE 3x3 LED Matrix?

What is inside the LEGO 3x3 Color Light Matrix 45608? Pictures of the assembled Top- & Bottom- PCB would be helpful.
7 votes
1 answer
2k views

What electronics are inside the SPIKE Prime angular motors?

Is there any information available about the internals of the SPIKE Prime and Robot Inventor angular motors? What Hall-Sensor is used by the SPIKE motors? To be more precise: I'd like to get ...
7 votes
1 answer
1k views

Where can I get replacement cables of this kind?

What I'm looking for: This is a 4.5 V 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'...
3 votes
0 answers
62 views

Which alternative electric connector is compatible with 12V plugs?

Which alternative commercial off-the-shelf electric connector matches with the LEGO 12V connector? Are there for example mini-banana-plugs which match with the LEGO standard?
9 votes
1 answer
1k views

white-coloured light brick for the iron man sets

I've recently built the Marvel Iron Man Figure (76206) which comes with a light brick to power the 'arc reactor' in the set I find it problematic that the light brick lights up orange, rather than ...
8 votes
2 answers
967 views

How to integrate hardware/embedded button with LEGO?

I have two different buttons (B3F-1000 and 3a250vac switch) which I want to integrate into a LEGO "machine" which I'm powering with an Arduino. Since the rest is integrated into LEGO plates, ...
8 votes
3 answers
2k views

Recommendation on how to build a "brick presence detector"?

I want to build a model of a complex machine with Lego and Arduino or a Raspberry. The machine model also features several accessories that can be added or removed during operation of the machine ...
0 votes
2 answers
132 views

What is the carbon footprint of running a Spike Prime robot? [closed]

We are trying to calculate how much carbon is emitted from running a Spike Prime robot off one charge (roughly 8-10 hours)?
6 votes
2 answers
1k 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 ...
2 votes
0 answers
201 views

Fixing a LEGO M Motor connector

I have several broken "Powered Up" M motors and I took one apart to see what was wrong. I ended up snipping off a section of the wire and re-soldering it back together but testing with an ...
1 vote
0 answers
311 views

Problems with the main rotor speed in Airbus H175 (42145) set?

I'm having problems with the main rotor in "slow" position. The speed stays the same no matter what position the joystick is in. On the other hand, in "fast" position the blades ...
4 votes
1 answer
316 views

Does LEGO sell a DC relay for Power Functions?

I’d like to use a signal from a (5V) littleBits circuit to control some (9V) Power Functions motors. Does LEGO sell or recommend a DC relay to facilitate this sort of thing? If the answer is no, I’d ...
0 votes
0 answers
418 views

How to increase the voltage supplying to technic motor through the Technic hub?

I have four Technic Large Motors, all connected to a technic hub. I am using the motor to turn some large propellers and the hub is powered by six 1.5 V (maybe less) batteries depending on the brand. ...
3 votes
2 answers
2k views

What is inside the LEGO Powered Up L motor?

What's inside the Powered Up L motor (part bb0959c01)? How do its internals compare to the XL motor and the M motor?
9 votes
1 answer
3k views

What is inside the LEGO Powered Up M motor?

What is inside the M motor in the new Powered Up system? How is it different from the older Power Functions motor?
2 votes
1 answer
269 views

Where can I get replacement battery connectors for old Lego Duplo Train?

I have the same Duplo Train that Pieterjan posted a picture and video of in September ('Old Lego duplo train not working on batteries'). In my case, it is clear that the battery connectors are ...
6 votes
2 answers
4k 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 ...
25 votes
1 answer
7k 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 ...
2 votes
0 answers
52 views

Is there any good comparison of Lego Electric systems? [duplicate]

Coming back to Lego after a 20 year break gave me headache when discovering the electric systems available. Is there a good comparison around or could we make one here? What connector fits, what ...
4 votes
1 answer
120 views

Transformer 45517: power supply or charger?

I would like to build a charging station for EV3 with rechargeable battery (45501). Does the transformer (45517) give a simple stable dc voltage (power supply)? Or does it provide a controlled voltage ...
12 votes
1 answer
5k views

What internal electronics do Spike Prime and Mindstorms Robot Inventor use?

What electronics live inside the SPIKE Prime hub? How powerful is the hardware?
69 votes
3 answers
12k 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 ...
7 votes
1 answer
1k views

What is inside the Technic Powered Up XL motor?

What components are inside the new Technic Powered Up XL motor? Is it the same as the PF XL motor, except with a different connector?
5 votes
1 answer
281 views

EV3 not recognizing resistance correctly (MicroPython)

I recently tried measuring the resistance of a thermistor using the .resistance() method, the results are sadly not accurate. I measured the resistance with a multimeter and it showed 100kΩ, while the ...
3 votes
1 answer
215 views

Can an EV3 power a buggy motor with the NXT to 9V extension cable?

On Philo's motor comparison webpage, https://www.philohome.com/motors/motorcomp.htm, it says that the buggy motor (42908 lego id, 5292 bricklink id) is not recommended to be powered by an RCX as the ...
6 votes
1 answer
1k views

Train with two Powered Up hubs

I'm building a motorized train. The locomotive has two Powered Up train motors, one at each end. However, no matter where I place the hub inside the locomotive, the wires on the train motors are too ...
7 votes
1 answer
279 views

What is the max current for the EV3 I/O port's VCC pin (pin 4)?

The LEGO EV3 Hardware developer kit says that the fourth pin of input or output port provides a voltage of 5 volts but doesn't give the the maximum current that can be drawn from the pin. What is the ...
3 votes
1 answer
517 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 ...
0 votes
1 answer
1k 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 ...
8 votes
2 answers
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 ...
5 votes
1 answer
2k views

What internal electronics does the Control+ Technic Hub (88012) use?

I'm interested in comparing to the other Powered Up hubs, which are already documented here: Mindstorms v4 / spike prime What internal electronics do SPIKE Prime and Mindstorms v4 use? train 6AAA hub ...
4 votes
2 answers
231 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
2 answers
249 views

How does the 8365 Tuneable Racer work?

The set 8365 Tuneable Racer has tunability as its main feature, meaning the motor's parameters can be changed by adding, removing or swapping certain additional elements. However, these parts seem to ...
4 votes
0 answers
53 views

How do I sync audio and movement on my NXT 2.0?

How do I sync audio and movement with my NXT 2.0? I'm building an animatronic head and I can't find a good way to sync it with external audio because the internal speaker is too quiet.
12 votes
1 answer
2k 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 ...
8 votes
2 answers
2k views

How do the Infrared Towers work?

I've seen a few Mindstorms "infrared transmission towers" listed on Brick Owl, Bricklink and other sites. However, I cannot find any good documentation that how they work, how they are used ...
3 votes
1 answer
147 views

What is the maximum voltage for motors from Cybermaster units?

I recently bought a non-functioning Cybermaster unit [part:71797]. As the motors in there might be perfectly fine, I'd like to use them. I could not find information on these motors (as opposed to ...
3 votes
1 answer
1k 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 ...
4 votes
1 answer
2k views

Does the Mario Starter Course require a smart device?

I've seen that the Mario Starter Course (71360) requires a smart device to play: I'm trying to limit the amount of screen time that my child consumes, and I'm wondering exactly how required the smart ...