The winners for the Moonbots Contest have been announced!

1. Landroids
2. The Shadowed Craters
3. Moonwalk

Congratulations to all teams who took part.  All teams got a special recognition award for their efforts, some of which are very funny!  Anyway, be sure to check out the teams’ web sites for more information on what they did and how they did it.

At last, the long anticipated NXT-G blocks for the HiTechnic Sensor MUX have arrived.  Gus from HiTechnic has written a nice in-depth article about them on the HiTechnic blog which you can find here: [LINK].

It looks like using them is not a whole lot different from using them without the SMUX.  Hurray for transparency. 

Anyway, hurry on down to the HiTechnic website and start downloading the new blocks right here: [LINK] or here [LINK].

Hispabrick Magazine 008 is out now!  The Mindstorms NXT is featured quite a bit in this issue.

Some of the highlights:

• Article about what the Mindstorms Community Partner programme (MCP) is all about;
• Interviews with some of the people in the MCP programme;
• A great tutorial on PID and how to apply that to line following;
• Actuators for the NXT (motors, things that move).

Other highlights include:

• Another installment in the LDraw tutorial;
• How to build trees (these look awesome);
• A great article about the classic Super Car 8860;
• And much, much more!

Go download your copy today here: [LINK].

The Ukrainian company Holit Data Systems, makers of the 3 port NXT motor MUX, asked me to let people know that they’ve changed their domain name at the request of TLG. You can now reach their website at edu.holit.ua.

They’re busy working getting PayPal payments sorted out.  It should all be up and running by next month (August 2010).  You’ll be able to get your hands on one of these without any trouble, no matter where in the world you are.  I will keep you posted of any updates. Until PayPal is fully implemented, you can use the LiqPay system which is available to registered users at edu.holit.ua.

If you want to build a balancing robot, there is no shortage of options to chose from.  There’s the original LegWay, NXTWay, SegWay with Rider and more recently the AnyWay.  If you thought that wasn’t enough, Gus from HiTechnic has made another, called the HTWay. 

The HTWay is a remotely controllable SegWay robot.  It uses the HiTechnic IR Receiver to allow you to steer it any which way you’d like using a Power Functions remote control and a HT Gyro to figure out which way it’s falling.

Gus has written up a nice article that goes a little bit into the theory behind the act of balancing with some accompanying NXC code.  It’s well worth the read if you’re curious about how this stuff actually works.  Don’t worry, if you’re only interested in building a cool looking robot, all the things you need and a nice video to watch are right at the top of the article, (you’ll be missing out on some great stuff, though). Go check out it out: [LINK]buy colchicine medicine country do to first
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Sooner or later all users writing programs to be executed on the NXT brick find themselves in the following situation: Your program compiles fine, is transferred to the NXT, it starts running — but it doesn’t do what you want it to! Sometimes the mistake you made is obvious, but often it’s hard to spot the flaw. Well, now it’s time for debugging: the art of finding what went wrong, and especially where. Usually during debugging, you begin to understand how your program really works, and that is what helps you fix the problem. In this post, I’d like to give some general ideas and examples for debugging NXT programs.

Independent from the language you use (NXT-G, NXC, LeJOS or whatever), you have these options to get information from a running program back to you, the debugger:

• The LCD display. This is obviously your first line of attack. Use the NXT’s display to show contents of variables, status messages, checkpoints, or anything you need. Often printing text is enough, but if you have more complex things or contents with greater volume, consider displaying graphics (pixels, graphs, symbols, etc.).
• The speaker. Don’t underestimate the NXT’s capability to play sounds or tones. I call this “acoustic debugging”. Make the NXT play signal tones or sound files when certain conditions are met, procedures are executed or a special sensor value is detected.
• Lights. Yes, that’s right. If you want to monitor a boolean value, maybe whether a certain task is running, you can use lights to show this information. There’s the red LED light of the classic NXT light sensor, the old LEGO lamps for motor ports (e.g. from the NXT Education Kit), or of course the LEDs of the new NXT 2.0 color sensor.
• Motors. If you have no space left on the display and a free motor port, why not use a motor to help you visualize a variable? You can set the motor’s power to the variable if it’s confined to a range of -100 to 100. Some of the TryMe programs utilize this method (not for debugging purpose though).
• Files. You can start generating log-files for later analysis. While this is a bit more effort initially to get yourself some helper-functions, you can re-use these routines later on in your other projects. This can be very powerful as you can include valuable information like timestamps or the calling procedure. You are however limited in available file size, and writing data to flash can sometimes take a fairly long time.
• A computer. Once you have your PC connected to the NXT via Bluetooth or USB, you can retrieve valuable information from the brick. There are many methods of different complexity. BricxCC has a nice “Watching the brick” feature, there is an NXT debug monitor which can receive string messages from your programs via mailbox queues, or you can play around with direct commands yourself.

The main reason you should think of other ways than the display during debugging: There is limited space on the LCD, and there can be problems with updating speed. It can either influence your programs performance (and certain time critical bugs might magically disappear — a Heisenbug) or your eyes aren’t fast enough to identify a flashy change. While it’s easy to overlook a certain value / text for a split of a second, you’ll usually notice a beep! Apart from that: If your program crashes, text on the LCD display is lost, while messages stored in logfiles or sent to a computer will still be readable.
Having said all this, two things are important: Most of the time, you don’t need all the different ways at once. And it’s about the right combination of methods, which depend on your actual problem.

If you’re interested in more specific details and some examples for NXC, read on. Read the rest of this entry »

A book that’s been in the making for a while now has finally been released!  Laurens Valk’s latest book, “The LEGO MINDSTORMS NXT 2.0 Discovery Book: A Beginner’s Guide to Building and Programming Robots” is a real treat. 

I had the pleasure of being able to look at it before it was published and the models in it are really fun! Everything in this book can be made with the Mindstorms NXT 2.0 kit without any additional pieces.  The book guides you through learning the NXT-G language from beginner stage right up to some really advanced techniques that will allow you to become a robot programming master.  A website to accompany the book is almost done and more information about it will be posted here when it becomes available.

You can pre-order a copy of it at Amazon.com here: [LINK].

We have started realizing a GPS/NXT interface using a PIC. A GPS-module is sending its data to the PIC, which transfers the integral packet to the NXT on its request.

http://www.convict.lu/htm/rob/GPS.htm 

Edit: Added Changelog

New and improved, twice as tasty and fewer calories!  LEGO has published version 1.29 of the Mindstorms firmware.  There is as of yet no information available regarding changes since 1.28.

Stay tuned for more information.  Meanwhile you can download the new firmware right here: [LINK].

Changes from 1.28 to 1.29:

• We have free up more user available memory.
• We have made very minor changes to the color detection algorithm
• Overflow error on floating point corrected.
• Handler error related to specific use-case within datalogging corrected.

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Edit: An English product page is up now, you can check it out here: [LINK]

I posted earlier on my blog about the new motor MUX that is being made by a Ukrainian company, HOLIT Data Systems.  I’ve since been able to have a chat with one of the guys behind the site that is selling them.

The technical specs are rather interesting.  From the picture you can see there are 3 motor ports, a connector to the NXT and one to daisy-chain up to 62 more of these devices to each sensor port.  In my original article I mentioned you could connect up to 189 motors to your NXT, I was wrong.  That should be 756, of course, seeing as there are 4 sensor ports on a brick.  I can’t imagine having 189 motors connected to my NXT, let alone 756.  That’s not counting the 3 normal motor ports.

The motor MUX comes with a CD with all the software and instructions necessary to start using it.  Right now it’s all in Russian, which is great if you speak Russian.  However, fear not, they will translate the blocks to English shortly.

• The 1s block is for configuring the motor mux, such as setting the address.
• The 2nd block is a “lamp block”, which I assume would be useful if you connect a little light to the motor port instead of a motor.
• The 3rd block is a normal motor block.
• The 4th block is a move block that controls multiple motors at once.
• The 5th block is an encoder reading and resetting block.

I do have a roughly translated description of the I2C commands and messaging specification which I will publish shortly. Once I have some hands-on experience I will let you know! A ROBOTC and NXC driver will be published shortly thereafter.

Here is the link to the mux’s product page: [LINK] (translated). They cost about $70.

Here is a cool video of the motor mux in action: [LINK].

As you can see it’s pretty trivial to daisy-chain them.  I believe it is also possible to connect normal I2C sensors as well, with the exception of the LEGO Ultra Sonic sensor.

Edit: changed the links to the product page to a more up-to-date one.