17 votes
Accepted

How can I motorize 42077 Technic Rally Car with LEGO Power Functions?

With some Power Functions elements and a few extra pieces, it's pretty easy to turn the Rally Car into an RC car. Here's a quick demo video of my design in action. And here are the instructions I ...
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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 ...
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15 votes

Which is faster: M motor or XL motor?

XL (8882): It delivers a maximum torque of 90,4 mNm (600 mA). Without load its rotation speed is around 220 rotations per minute. L (88003): It delivers a maximum torque of 45,4 mNm (450 mA). ...
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  • 366
11 votes

How to use Power Functions with Mindstorms EV3?

As mentioned by @guestguy123 and @eficker, it is easy to combine an EV3 cable and a PF cable to make a custom cable that allows the EV3 to control. This can even be done without soldering - I just ...
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  • 16.5k
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. ...
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  • 5,090
9 votes
Accepted

How to control a 88004 Servo Motor with a Raspberry Pi?

LEGO "Servo Motor" has little to do with a RC servomotor. To drive it, you need to: Power it at 9V (probably works at 5 volts, but with less torque) through PWR/GND terminals To move in one direction,...
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  • 2,663
9 votes
Accepted

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 ...
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  • 445
9 votes
Accepted

9V Battery instead of PF Battery Box

Most Power Functions pieces will run in classic 9V mode. The IR receiver can't, but motors and lights can. A hacky solution: Many people have done this by cutting up an extension wire, and ...
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8 votes

What are the various LEGO motors that have been produced over the years?

For a comprehensive enumeration and measurements on all motors, refer to Philo's excellent page on this topic: http://www.philohome.com/motors/motorcomp.htm There are some LEGO motors that are ...
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  • 13.9k
8 votes
Accepted

Is the LEGO BOOST kit compatible with EV3 or PowerFunctions motors and sensors?

While LEGO BOOST is compatible with the bricks from other sets, the motor, distance sensor, and Move Hub are not electrically compatible with current EV3 or PowerFunctions components. BOOST uses the ...
8 votes
Accepted

Lego Technic 42048 with LEGO 8293

Well the thing with LEGO, (Technic, Classic, Mindstorms or whichever category you talk about) is that it is customizable. You might not get instructions to combine Power Functions with this kit but ...
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8 votes

Does a LEGO Technic Power Functions L Motor work with a v1 receiver?

Yes, they appear in combination in the 42030 and 42095 sets. The L motor only appears in combination with the V2 receiver in the 41999 and 9398 sets. In my experience, there is a small performance ...
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7 votes

What advanced railroad features are possible with the Lego PF train sets?

You can create crossover tracks out of LEGO elements much like I did in this video. https://www.youtube.com/watch?v=_i6OWkxXtuo I got all the parts for around 4€ Also you can create your own ...
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  • 256
7 votes
Accepted

What are the largest LEGO® Power train sets available commercially [Oct 2014]

Right now, the largest commercially available train is the Lego City Cargo Train, Set 60052. It comes in at about 887 pieces. There are 30 rail pieces in this kit. Extra rail pieces are also ...
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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 ...
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  • 71
7 votes

How do I connect two models to one PF motor?

As an addition to Ambo100's very nicely detailed answer, I'd like to add one more option: If either of the two things you are powering might suffer from friction (or perhaps a child holding it still), ...
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  • 16.5k
7 votes
Accepted

Augment LEGO City Mobile Command Center 60139 with Power Functions LEGO 8293?

You are not likely going to be able to add the power functions motor to this set without some major modifications. The truck in the set uses pin type wheel connections, the motors normally use technic ...
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  • 1,871
7 votes
Accepted

Can I use two remote-controlled LEGO Tracked Racers 42065 simultaneously?

Yes, LEGO's Power Function IR elements have 4 different channels you can switch between with an orange slider on the receivers and remotes, so you can run up to 4 at a time.
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7 votes
Accepted

Confused about Power Functions M-motor 8883 and 8293

Yes, both items contain the same M-Motor part.
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7 votes
Accepted

Which resistor value is used for which motor in Power Functions 2.0?

M Motor (Powered Up/WeDo 2.0) The M motor has a 2.2kΩ resistor between pins 5 and 6. Pin 6 is connected directly to pin 3. LED Lights I don't own any lights yet, but according to this post, they ...
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  • 34.5k
7 votes

How long does it take a M-motor to go 1 googol rotations?

According to Philo's LEGO motor datasheet an unladen PF-M motor rotates with 405 RPM. One googol is ...
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  • 13.9k
6 votes

Which is faster: M motor or XL motor?

Theoretically, in terms of power (speed • torque), the XL Motor is faster than the L Motor and M Motor. The reason being, you can gear up the XL Motor 2:1 and have the following output: running torque ...
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6 votes

What are the largest LEGO® Power train sets available commercially [Oct 2014]

Apart from those mentioned by Joe, there are several larger sets in the Advanced Models category. They are not powered out of the box, but can be motorized. These are: 10233-1: Horizon Express 1351 ...
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  • 13.9k
6 votes

Problems with New LEGO Cargo Train

I would start by breaking down the problem into a few simple checks: Take the battery pack out of the engine of the train and press the green button. Does the green LED light turn on? If no, there is ...
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  • 16.5k
6 votes
Accepted

What LEGO Power Function parts do I need to make an RC car?

Your assumptions appear to be mostly correct. Just for clarity, these are the minimum parts required: A battery box A motor for driving A motor for steering (unless you want to try a steer-on-reverse ...
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  • 34.5k
6 votes
Accepted

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 ...
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  • 34.5k
6 votes

How do I connect two models to one PF motor?

Regardless of the models, you can always connect a single motor to one or more models by splitting the axle using (for example) angular wheels or bevel gears. I covered two ways of transmitting ...
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  • 17.3k
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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  • 34.5k
6 votes

Advice on Power Functions for an 11-year-old?

The easiest way to start out with Power Functions is to get an official LEGO set that comes with Power Functions. This will allow your child to really understand how Power Functions works. If he is ...
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6 votes
Accepted

What is the quietest LEGO motor?

I don't think it would be practical to evaluate every LEGO motors sound output, almost all LEGO motors are fairly noisy so I think it is best to address the problem of a noisy motor in general. My ...
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  • 17.3k

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