16 votes
Accepted

How much current do the LEGO motors draw?

YES! Philippe Hurbain (Philo) has put together a great and very detailed write-up on those and many other LEGO 9V electric motors. You can find it here: LEGO 9V Technic Motors compared ...
14 votes
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What electronics are inside the LEGO Powered Up hub?

The bulk of the space inside the Powered Up hub is consumed by the housing for the 6 AAA batteries. A small portion of the top of the hub contains the main printed circuit board. Here's how it looks ...
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12 votes
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What is inside the LEGO Powered Up M motor?

Let's take a look. The first step to disassembling the motor is removing the small Philips screw on the bottom: Now there are a pair of gray tabs in the back white section that we need to release. I ...
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12 votes
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What is inside the Technic Powered Up XL motor?

I was curious about this, and TLG was willing to provide me with one of these motors, so I opened it up. I was able to get the outer shell off by cutting down the 4 tabs on the outside. This motor ...
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12 votes
Accepted

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

If we open the hub we can take a look at the main PCB inside. There's just one PCB in addition to a small speaker and the replaceable lithium ion battery. Here's the top of the PCB: And the bottom: ...
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10 votes

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

The LEGO Power Functions connectors have 4 standard designations regardless of the usage: 9V power "0V" Ground C1 "control 1" C2 "control 2" It seems for motors that the 9V and Ground are unused. ...
  • 5,100
10 votes

Is there a way to buy just the robotic parts?

Yes, you can buy all the electronic parts by themselves, but given that the electronic parts are the bulk of the cost, you may not save much. The MINDSTORMS EV3 set (MSRP $349.99 USD) contains: 1 - ...
10 votes
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Where can I get replacement cables of this kind?

This is an Electric, Wire 12V / 4.5V. They can be found here: Catalog: Parts - Electric, Wire & Connector Just find the right length.
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9 votes
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What are the differences between NiMH and Alkaline batteries for the EV3?

NiMH batteries only provide 1.2V per cell whereas Alkaline batteries provide 1.5V (nominal values). This means that new/fully charged batteries will provide a total of 9V for Alkaline and 7.2V for ...
9 votes
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Custom Power Functions plug design

I eventually made my design available for download over at Shapeways with a CC BY-NC-SA license (login is required in order to download the STL file). I tested it at my local maker space in PLA on a ...
  • 445
8 votes
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What internal electronics does LEGO Boost use?

Here's what the main board in the Move Hub looks like from the top: And bottom: The Move Hub includes the following hardware: Motors The two built in motors are fairly standard DC motors. They ...
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8 votes
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Classic 9V battery box current limiter?

The short answer is about 150mA. Electrical Characteristics From the limited testing that I've done, the component you pointed out appears to be a positive temperature coefficient thermistor. Here's ...
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8 votes

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

I'd be tempted to use the Batmobile (76112) design: Basically, you have independent motors for the left and right wheels. This allows you to steer quickly and easily without the fuss of a traditional ...
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8 votes
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How do the Infrared Towers work?

IR Transmitter Tower exist in both USB version as well as Serial cable version. Page 7 of instructions for one of the sets (3804) that was using USB version has following explanation: Transcription: ...
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8 votes
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EV3 not recognizing resistance correctly (MicroPython)

Here is the schematic of an input port on the EV3 (available on official LEGO MINDSTORMS download page): And this is the implementation of the resistance() method from Pybricks MicroPython: STATIC ...
7 votes

Custom Power Functions plug design

I make a print (with silicon) of the Lego PF socket, in 2 halves. I just need the C1 and C2 electrical contacts, so I'm just dealing with them, but you can go for the 4 contacts. So in the bottom ...
  • 71
7 votes

Duplo Locomotive: What is this inner part used for?

They are protective locks. If something (let’s say kids hair, or part of their clothes) gets stuck and dragged inside the wheel, these tiny blocks will lock the wheels and make sure it doesn’t keep ...
  • 233
7 votes
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Custom extension cables for Light Stax?

I have also little soldering experience, but I managed to create custom extension cables: First: open the cover with a small screw driver: Remove the PCB by lifting the small notch to open the light ...
  • 186
7 votes

What is inside BuWizz 2.0?

I don't have this part, so I can't directly give you the photos that you are looking for, but there is at least one teardown video floating around that we can use to see what is inside the BuWizz 2.0 ...
  • 34.9k
7 votes

What electronics are inside the SPIKE Prime angular motors?

Here's what the part looks like from the outside: The first step to opening it up is to remove the cover over a section of the drive. Note that this process is likely to cause permanent damage to the ...
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6 votes
Accepted

AA Battery Packs 54950c01 vs 59510c01

The main functional difference between these is the electrical connector. The one with the red switch uses the old style 9V connection, while the one with the orange switch uses the newer Power ...
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6 votes
Accepted

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

This is a Duplo Sound Effects Brick 2 x 4 with Water and Pump Sounds (Set 5605) brick from 2008. It featured only in 1 set, 5605 Tanker Truck.
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6 votes
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Running Power Functions Train Without IR Receiver/Remote

There is a fairly easy and cheap way to do this since you don't want real variable speed control. As you noted, connecting the AAA battery box directly to the PF train motor technically works, but the ...
  • 34.9k
6 votes

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

It sounds like you are asking how to motorize your own custom LEGO creations using motors that you may already have around the house rather than purchasing official motors. Before I answer this, I ...
  • 34.9k
6 votes

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

Boost and the other Powered Up components (the new City trains, the app-controlled batmobile, and WeDo 2.0) are controlled via Bluetooth. Any environment that can send bluetooth commands can be used ...
6 votes

Scarcity of electric parts: motors etc

Cost. If you look at any set with electric motors, etc. you will see a significant increase in the price of these sets. They have marketing research groups and accountants that somewhat dictate the ...
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6 votes
Accepted

How to integrate hardware/embedded button with LEGO?

For the first switch I bent the legs of the button and splayed them out just a little bit. Next I stripped off the caps of two Dupont connectors, ran them through the headlight bricks and connected ...
  • 2,488
6 votes
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Does the Mario Starter Course require a smart device?

Yes, a smart device is required. The box says the following: Smart device required but not included However, this set is not like Boost, where the intelligent brick just adds weight to your model ...
  • 34.9k
5 votes

Identify brick with internal battery, light and sound

If anyone is interesting in whether the battery can be replaced, the answer's yes-ish. As you can see in the picture, it's powered by a CR2032. The only hurdle here is that it's welded to the ...
  • 151
5 votes

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

This part is called Micro Scout with Dark Gray Base the white version on your photo comes from 9748-1: Droid Developer Kit (pictures via Bricklink)
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