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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 - ...
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9 votes

What are some good purist rotacaster / omni wheel designs?

Here's a design I've been using, based on this model by Lambert Varias: It's not a perfect circle, but it is relatively small all things considered: It's pretty simple, but here's a partial ...
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8 votes
Accepted

What are some good purist rotacaster / omni wheel designs?

I have copied a design by Isogawa Yoshihito I prefer it over the Lambert Varias design as the wheels are positioned more radially More pictures in this EuroBricks thread: https://www.eurobricks.com/...
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7 votes

How to make an exact 16 degree turn?

This is actually a surprisingly difficult task. If you search for similar questions over on the Robotics stack exchange, you will find very smart people who can't even get it right with thousand-...
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6 votes

Technic beam centering for beam with even length

Hmm... I don't know... I personally, wouldn't try to reinvent pin placement of Technic holes and Studs. I'm not saying being creative that way is too challenging. What I am saying is that, we should ...
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  • 8,718
5 votes
Accepted

How do I build this robot car?

There are several ways you can start with LEGO Technic. If you have no elements whatsoever the best (cost-efficient) approach is to buy a set that contains most of the parts. Or a couple of sets. Bulk ...
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  • 20.1k
5 votes

Anyone have the control block for the hitechnic color sensors?

It looks like the page listing downloads is down, but direct links to the downloads still work. I believe that this is the file that you're looking for: https://www.hitechnic.com/upload/306-Color%...
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  • 34.5k
5 votes

What are some good purist rotacaster / omni wheel designs?

Just stumbled across this little gem of a Lego omni wheel!
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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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  • 11.1k
4 votes

LEGO Mindstorms Motor Power

The RCX system provides a certain average voltage level (via PWM) to the motors. This means that speed can vary based on load, and may even vary slightly from motor to motor. Power will also vary ...
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4 votes
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When using pi * distance between wheels/tracks, how do I measure distance between wheels?

This formula will need the lateral distance between wheels, i.e. the distance between left and right wheel, not the back and front wheel. motor_pair.move(8.1 * math.pi / 2, 'cm', steering=100) The ...
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  • 156
4 votes

Is there any cross compatibility between 51515 and 31313?

It is possible to communicate between the 31313 and 51515 hubs. See these youtube videos: https://www.youtube.com/watch?v=PT4_4v1W2C8 https://www.youtube.com/watch?v=p3uk80tuqI4 In the first video a ...
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  • 388
3 votes
Accepted

Is there a way to convert .ev3 files to .uf2 files?

The .UF2 file format appears to be a fairly compact, binary format for reliably transferring data to "microcontrollers" (i.e. small embedded systems such as the EV3 controller), and is the format used ...
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3 votes

Technic beam centering for beam with even length

What if you had anti-studs where you want them, at stud-depth, but also overlaid technic holes at full technic pin depth where you want them? This would lead to a complicated, non-standard arrangement,...
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3 votes

How to make an exact 16 degree turn?

Do you have a gyro sensor on your robot? I'm assuming you're using an EV3 set, and the Mindstorms programming environment. If so, reset your gyro sensor, and then insert a loop block attached to the ...
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3 votes
Accepted

Which LEGO set is best suited to build robots?

Your question is not so clear, but it seems like you want to build robots and you want Technic pieces. Then Lego Mindstorms is the product you should buy. While not formally part of the Technic range, ...
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  • 1,678
2 votes

Mindstorms EV3: Patrolling a number of rooms - what are my options?

For moving on defined path you can achieve amazing accuracy with LEGO MINDSTORMS EV3 odometry combined with good gyroscope but this still will result in a collision sooner or later. Examples of such ...
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2 votes

How to make a conveyor belt with LEGO parts?

Another option is to use LOTS of 60483 Technic, Liftarm 1 x 2 Thick with Pin Hole and Axle Hole as shown in: https://youtu.be/X89pXBJaPWI?t=7s
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  • 43
2 votes

A 90 degree turn with Wheel part number 56145

Use your gyroscope sensor, set your program to have the Move Tank block turn very slowly in the "On" mode, and then use a Wait block checking the Gyro sensor until it sees an absolute change of 90 ...
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  • 16.5k
2 votes
Accepted

Is LEGO mindstorms good for a robot warrior or a small size soccer robot?

An option that comes to mind is building a Raspberry Pi-based robot. But it's not likely to be small nor easy to put together, code and all. I think going for a LEGO robot would be easiest; motors, ...
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  • 1,678
2 votes
Accepted

Is there a way to add a ultrasonic sensor on the ev3 COR3 robot?

The ultrasonic sensor is useful for navigation. This robot design has a nice skirt and positioning the ultrasonic sensor should not interfere with that skirt. Also the ultrasonic sensor is excellent ...
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  • 1,311
1 vote

Robot Inventor Bluetooth not working

Maybe this project legoBTLE4pi could help you. It connects a Raspberry PI via Bluetooth to a Lego Powered Up Brick and does all the funny stuff. The project is ongoing (nice TUI etc) but everything ...
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1 vote

How to make a Lego continuous conveyor belt

If you want the belts to operating in a single plane, you could try having an angled blockage across the corner which diverts the blocks onto the next belt, like this. If you don't mind them going ...
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  • 3,231
1 vote

Is LEGO mindstorms good for a robot warrior or a small size soccer robot?

It's easy to use Lego Mindstorms EV3 to build small robots. There are competitions such as the WRO where EV3 soccer bots compete. Sensors like IR seekers from HiTechnic are used to detect the "...
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1 vote

EV3 T-Rex we build keeps toppling over on step

I built a walking machine when I was a kid several (cough) decades ago, and it had a similar problem. We finally figured out that what I had built was very front-heavy. Weight has to be balanced ...
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  • 111
1 vote

NXT light sensor homework help

Without solving your homework, you will need at least the following blocks: for bullet 1 Light Sensor Data to Text LCD Panel Display for bullets 2 and 3 Loop (forever) Switch (based on light ...
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  • 1,311
1 vote

How can body segments be moved to precise angles in snake robot?

You could use worm gears, or worm gears, or compound worm gears, because you can slow the rotation down as much as you want, which means you can have super fine rotation. An extreme example of this ...
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1 vote

LEGO Mindstorms Motor Power

The motor speed is controlled by time modulating the available voltage (approximately 9 volts). So at 100% it looks like a continuous 9 volts. At 50% it is periods of 9 volts and 0 volts in equal ...
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  • 1,311
1 vote

RCX 2.0 Firmware downloaded successfully but "Run" does nothing

Could be the button indeed. These buttons are conductive rubber pressing on the circuit boards integrated contacts. Might need some cleaning there... Disassembly of the RCX is not easy but can be ...
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  • 2,663
1 vote

The Mindstorms EV3 Software crashes on OS X Yosemite 10.10.3. What do I do?

Updating the iOS version to 10.10.5 seems to have solved the problem for me. Hopefully this helps someone else out there.
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