Connecting to the iTunes Store.... We are unable to find iTunes on your computer.LabVIEW for LEGO MINDSTORMS was designed specifically for use with the LEGO Education robotics platform, providing a sophisticated teaching tool that helps students program the LEGO MINDSTORMS NXT brick. Exclusive features just for LEGO robotics: Incorporate lesson plan content and share student results in one place. Visually configure and control your NXT using a joystick or keyboard. Graphically configure and test motor and sensor connections. Easily log and analyze the data you collect from your NXT. NI has a website just for teachers. Find lesson plans, videos, and more. Program TETRIX robots in the FIRST Tech Challenge. Robotics for All Ages Discover a suite of educational robotics solutions for all ages. Find step-by-step getting started tutorials and support resources. Use this form to email a PDF copy of this catalogue page. Thank You for your request of Fundraising catalogues!
Your fundraising catalogues will be delivered at the beginning of August. Meanwhile please don't hesitate to contact us via email.. Thank You for signing up for the "Modern Teaching Aids" newsletter! You will receive exclusive offers, news and advice direct to your inbox now that you have signed up. We're sorry we can't seem to find the page you are looking for. Posts: 24 Joined: Fri May 14, 2010 8:56 am EV3 motor regulation troubles /watch?v=h9_pNfebQf4Sometimes the second motor gets all nervous, overshooting like it has P*10. I tried switching the cables, and then the other motor starts jiggling. Sometimes they both work fine.At 1:03 you can see a violent outbreak, ramming the other car for no good reason. But sometimes it's like that all the time.I can't figure out why this is happening to one motor, sometimes. Maybe some weird thread-scheduling issue? Or maybe this is the "undefined" behaviour you get, because once upon a time I set a negative power.
Posts: 5655 Joined: Fri Sep 28, 2007 2:06 pm Re: EV3 motor regulation troubles I'm using Clojure, but I hope you can pick out the LejOS API functionsCode: Select all(def left (lejos.robotics.MirrorMotor/invertMotor lejos.nxt.Motor/D))(def right (lejos.robotics.MirrorMotor/invertMotor lejos.nxt.Motor/B))(defn move [angle speed distance] (let [deg (* (/ distance wheel-circumference) 360) radius (trailing-radius truck-length angle) [outer-ratio inner-ratio] (speed-ratio width radius) [outer inner] (if (> angle 0) [left right] [right left])] (.setSpeed outer (int (* speed outer-ratio))) (.setSpeed inner (int (* speed inner-ratio))) (.rotate outer (int (* deg outer-ratio)) true) (.rotate inner (int (* deg inner-ratio)) true)))The weird thing is that it does it just to one motor...(not sure why the EV3 stuff is in the NXT namespace) I'm pretty sure it's a control problem. It keeps jiggling after the program is done, until I flt it.
I don't have a simple reproducible program. That's the thing with problems that happen sometimes. But I'm not doing much more thanCode: Select all(def steer lejos.nxt.Motor/A)(def left (lejos.robotics.MirrorMotor/invertMotor lejos.nxt.Motor/D))(def right (lejos.robotics.MirrorMotor/invertMotor lejos.nxt.Motor/B))(.rotateTo steer 100)(.setSpeed right 110)(.setSpeed left 90)(.rotate right 200 true)(.rotate left 180 true)The outbreaks seem to happen after I stop, reset the tacho count and reverse. Maybe the thread that is holding the motors in position sees this huge jump in tacho count and tries to correct it? Should I flt all motors before resetting the tacho count?The negative power was a bit of a joke. I did that a few days ago, and read it causes undefined behaviour. The jiggling and violence seems pretty undefined...I'm not waiting for a perfect release. LejOS is the best and most complete EV3 API out there that I'm aware of. Ok, this reproduces the problem for me, sometimes:Code: Select allimport lejos.robotics.RegulatedMotor;public class HelloWorld { public static void main (String[] args) { RegulatedMotor steer = lejos.nxt.Motor.A;
RegulatedMotor left = lejos.robotics.MirrorMotor.invertMotor(lejos.nxt.Motor.D); RegulatedMotor right = lejos.robotics.MirrorMotor.invertMotor(lejos.nxt.Motor.B); while (left.isMoving() || right.isMoving()); }}[/watch?v=h5ZnbSdAtBI It's not usually that bad, but it illustrates the problem well /watch?v=h5ZnbSdAtBIOk, so I have a medium motor on A and two large motors on B and D. In this case it was D that went crazy, but it differs. It is always only ONE of them that goes crazy. I never had the medium motor do this so far.What happens is that it's just turning, until it suddenly starts overreacting, and overreacting and overreacting. As you see in the video it's never really smooth to begin with, but acceptable. And then at some random point(not even at the reset part yet), it starts to get really bad, doing full-power oscillations of like 45 degrees on the D motor. at this point it just printed "got here" once, and is still doing the first leg.I'd say something like 1 in 10 over today, but it just did it pretty consistently.
Also, once it gets i this mode, it never gets out. Only after a clean reboot would it behave sometimes. The code below reproduce BOTH problems.First run it went pretty fine, but did a wild overshoot at the second reset.The second and third runs it just went completely out of control on D.I also noticed that at times when the D motors was sort of doing fine, it seemed to move at ~100ms intervals, with the other motor moving more constant.Code: Select allimport lejos.robotics.RegulatedMotor;public class HelloWorld { public static void main (String[] args) { RegulatedMotor steer = lejos.nxt.Motor.A; Posts: 1550 Joined: Thu Oct 30, 2008 4:54 pm By "more maths" you mean the subtraction of two tacho count values, right? Users browsing this forum: No registered users and 0 guestsLEGO Mindstorms BB8 Balancing Robot Posted by Christoph Bartneck on Oct 30, 2015 in LEGO, Project, Research | We have been working on balancing a robot on top of a ball, similar to what BB8 accomplishes.
We used a robot balancing on top of the ball instead of inside it. This is work in progress. Building Instructions for a cable that connects LEGO Power Functions (PF) with Mindstorms NXT/EV3 Posted by Christoph Bartneck on Jun 1, 2015 in Documentation, LEGO, Project | Harry Davis and me built a cable to connect a LEGO Power Functions (PF) motor to a Mindstorms EV3. The goal is to enable the EV3 to control PF motors. In particular I wanted to control a RC train motor through an EV3. LEGO produced a cable (8528) to connect old motors (RCX) to the NXT, but it is no longer in production. You can still get them through Bricklink, but it will cost you dearly. You still need a PF extension cable to convert the old motor plug (RCX) to the current PF plug. Firgelli produced a cable that allowed you to connect an modern PF to NXT directly, but it is also no longer in production. There are two more solutions but both are more complex and costly. First, you can use the PF Mate from Mindsensors (currenlty $35).
It sends IR signals to the IR PF receiver and thereby allows you to control motors even at a distance. The second option is the GlideWheel PF (currently $38) that directly connects a PF motor to the EV3. It also features a rotation sensor so that you can control the PF just like you would control a Mindstorms encoded motor. Both of these solutions offer a great functionality but they are also expensive, in particular since the components necessary for a custom made cable only costs a few cents. At Amazon you can get a book Make: Lego and Arduino Projects: Projects for extending MINDSTORMS NXT with open-source electronics that will show you how to do such projects, but for now it is time to pull up our sleeves and do it ourselves. TechnicRobot already showed that it can be done but detailed instructions were not yet available. We also built a casing for our cable so that it can be easily integrated into your model. Here is the final result: And here is a video that shows our solution at work:
The Robot Engine Used For A LEGO Arduino Robot Posted by Christoph Bartneck on May 27, 2015 in Featured, Project, Research | We build a new LEGO robot based on the popular LEGO flash lights. We use custom made 3D printed parts to put small servo motors into its head, chest, arms and legs. The robot has six degrees of freedom. In addition we embedded a camera, microphone and speakers into the robot. The robot is controlled through an Arduino micro-controller. We used The Robot Engine to create animations for the robot and to design interactions with users. The paper will be presented at the Ro-Man2015 conference in Kobe. Here are some useful resources for you if you intend to build a similar robot: 3D files for the custom parts Building instructions for the robot Tutorial for the software setup Tutorial extension for the software setup The Robot Engine software The credit for this robot go to: Time Lapse Movie On The Assembly Of An InMoov Robot
Posted by Christoph Bartneck on Jun 27, 2014 in Design, Project, Research | We have some excellent french students at the lab right now and they pushed our InMoov project forward. Here is a time lapse movie of the assembly of the robot. Building an off road car with LEGO Technic Posted by Christoph Bartneck on Oct 27, 2012 in Design, LEGO, Project | It has long been a dream of mine to build a remote controlled LEGO car. LEGO has many Technic cars in their program that use the Power Functions to remote control certain functions, such as opening doors or lifting an arm. Power Functions use infrared light for communication between the sender and the receiver. In the past, LEGO also had remote controlled cars that use radio frequencies, which is much better, since it does not require a line of sight and has a much further reach. Recently, LEGO released the 4×4 Crawler and it really triggered something inside of me. I ordered the set, but when it arrived I never put it together.
I started to build my own cars right away. I looked for inspiration on the internet and found many great off road cars, trial trucks and multi purpose car technology. In particular the work Pawel “Sariel” Kmiec. Check out his book “The Unofficial LEGO Technic Builder’s Guide” or visit his website. LPE Power also has some wonderful instructions on how to build real car technology with LEGO. PhD opening in Human Robot Interaction Posted by Christoph Bartneck on Aug 29, 2011 in Project, Research | The HIT Lab NZ at the Canterbury University (Christchurch, New Zealand) has the following vacancy for a PhD student: Understanding Anthropomorphism and Animacy In The Interaction Between Users and Robots Robots that interact with humans are becoming increasingly important in our society. However, their life-like appearance and behavior is challenging their acceptance. In this project will establish new fundamental understanding of the role that anthropomorphism and animacy play in the behavior of robots when interacting with users.