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Found 189 results

  1. Here's my little dumper truck. Functions: - drive & steering (obviously) with PF - adjustable suspension angle (left/right) controlled by a Mindstorms EV3 unit that reads sideways tilt from an accelerometer to keep the truck upright; basically a self-leveling suspension - dumping with EV3 reading PF remote using an IR sensor - Baja Claw TTC tires by RC4WD on Lego 56mm rims. I've tried to fit more, but the problem with these trucks is that the chassis has actually little room, it needs to be pretty flat to fit under the cargo hold, and the area with the most room (front of the front axle) is taken up by the Mindstorms EV3 unit. There was a 4-speed transmission initially, but I've taken it out as it kept disengaging under stress (the truck weighs 4.156 kg). Photos: https://www.flickr.com/photos/44849526@N06/albums/72157710566416217
  2. Hi, After lurking for several years and after arising of this new Mindstorms forum it's time to start sharing some of my own MOC's. I present the Boogie Burnout: This bot is based on the Rocker-Bogie suspension mechanism, which is also used for the Curiosity and Opportunity Mars rovers. The Bogie-Burnout is my own interpretation of the system and not a copy of existing robots. My main goal was to experiment a little and see if the Rocker-Bogie system would work in the scale of my other MOC's All 6 wheels are able to pivot up and down and turn in every direction. The main problem I faced building a rover this scale was the flexibility of the Rocker arms in conjunction with the middle base part of the robot. Adding flexible links between the left and right wheels solved most of the flex, but turning the wheels 90 degrees still caused the robot to look like a drunken sailor. Adding removable stabilizers solved most of the wonky movements. When not driven 90 degrees side wards these links can be released on one side to give back all flexibility to the rocker system when driving over obstacles. As it turned out, a Lego Technic structure this big has enough flexibility to drive over obstacles without having to unlink the stabilizer bars. The wheels are driven by 4 medium Power Functions , which are geared down in a ratio of 11.7 in two steps. To prevent the current regulator kick in, each medium motor has his own IR receiver, which makes 24 receivers in total. The Power Functions remote is driven by two Mindstorms motors, one for speed control and one pressing the stop button. Controlling two channels simultaneously and thus reducing the amount of IR receivers resulted in lag and speed difference between motors. For each two motors and receivers there is one battery box, this again to prevent the current limiter kicking in. The outside plating of the rover can be removed easily within seconds. Bonus: The Bogie Burnout is high enough to drive on top of one of my older MOC's, which opens some possibility's on events :) Video: Note for the purists: This is not a 100% pure MOC. Some 0.5mm Teflon rings are used to prevent slack in the mechanism and the Mindstorms cables are custom made to length. Some tape is added to the wheels to prevent them from scratching.
  3. This article about the new Candy Circles, is related to two other threads of mine: 1) The Lego Candy Sorter 2) The Lego Candy Warehouse The new developed Lego Mindstorms EV3 Candy Circles are replacing the Candy Sorter. The color detection of the Candy Sorter was simply not reliable enough. Once calibrated, it worked fine but it was too sensitive for a change in light. Therefore, it was not good enough to perform for a longer time, e.g. at Lego World or during another demo. We decided to go back to manually sorting the candies. But then we still needed some dispense mechanism to release a candy, that would be stored in the Candy Warehouse. I came up with the following solution: Four large circles, containing the candy. A circle would be able to release one candy at a time. The released candy would then be transported to the Trebuchet (where the candy would be put in a container, and then the container with candy is stored in the Candy Warehouse). This was the first prototype: As you can see, there is a touch sensor and one marker added onto the ring. The marker was used to sync a full rotation. After the sync, I would just rotate the ring 360/16 degrees to release the next candy. Because there is always a bit of drift, the sync (per full rotation) was planned to make sure that the drift could not increase infinitely. But, of course it would be better to stop exactly at each bucket. So I made a second proto. As you can see, each bucket has its own marker to stop exactly at the right position. This proto was good enough to start building four circles. And a matching conveyor belt. This is the result: And of course a video: Next step to make: how to determine that a candy circle is empty? I don't have free ports to add an additional sensor. And of course it needs to be reliable! Will keep you posted. -- Hans
  4. Hi all, I have a LEGO office building with an elevator. I've automated the elevator with a mindstorms touch sensor. The program starts by descending down the elevator shaft until it sits on top of the touch sensor at the bottom of the elevator shaft. Ideally, the touch sensor is supposed to trigger the mindstorms motor to turn in the opposite direction and pull the elevator back up for fifteen seconds. The mindstorms motor turns again in the opposite direction, so the elevator descends down again to hit the touch sensor. (The process repeats indefinitely) In a vacuum, this program works fine. However, I've had numerous issues with the sensor not triggering, and the elevator eventually winds in the wrong direction and binds with the roof, breaking. I've tried making the elevator heavier, but it still has issues. I want to program a fail safe so that it will bypass the first wait block or cut off the program if the touch sensor doesn't trigger within a certain timeframe. I've included a picture of my current program. Within the infinite loop, I want the loop to start by waiting for the touch sensor to be pressed, then executing the two other motor commands I have following it. While the program is waiting for the touch sensor to be pressed, I want another thread to wait for twenty seconds. If the touch sensor is not pressed within that timeframe, I want the program to bypass the first touch sensor wait block and continue with the last two motor rotations (then repeat). I've been able to branch off into two different coding threads within one program, but I can't recombine the two inputs into the beginning of one block. How do I do this or accomplish my goal in another way? I'm at a convention right now and I really just want this to work. Some more information, the mindstorms motor is connected to a control switch, which tells my power functions motor which way to turn. That's why the mindstorms motor rotations are so short. Thank you everyone for your help.
  5. MINDSTORMS EV3 OMNIDIRECTIONAL ROBOT INTRODUCTION The reason you are stuck with me as Moderator/Admin is actually caused by Mindstorms EV3. I proposed an Index for Mindstorms and Bonaparte figured I could make one myself. Resulting in me making one, and one thing lead to another. In 2013 TLG released a brand new edition of LEGO Mindstorms. Owning two NXT sets, which I had hardly used to build something cool, I was determined to change that when I bought the EV3 sets. I first bought the 45544 - EV3 Education Core Set set, and shortly after that I added the 31313 - Mindstorms EV3 (Retail) set to my collection. After some initial experiments both unit had been turned on approximately the same number of times as the NXT. This being a terrible waste of potential, I recently decided to start building the robot I have been planning in my mind for a long time. My goal is to build a fairly big humanoid(-ish) robot. Does that sound familiar? Of course it does, since my good mate Simon Burfield (Burf2000) has built a super cool humanoid robot recently. We also know him of the Wheelchair and Segway. And yes, he is a big inspiration to me. What I am aiming at is a Omnidirectional Robot with one or two arms and a Wall-e like head. The height of the robot will be approximately the size of a child, let's say around 120cm. Omnidirectional means allowing movement in all directions (more on that in the next chapter). Since I have no idea where this will end, I have created a WIP topic, in review style. I will add chapters along the way. When I add a new chapter I will post that new chapter and edit the original post. Feel free to comment, hint, tip, suggest, mock and ridicule Before we continue I'd like to give my man Burf and the guys at Rotacaster a big thank you! OMNIDIRECTIONAL WHEELS Here's the wikipedia description for Omni wheels: Omni wheels or poly wheels, similar to Mecanum wheels, are wheels with small discs around the circumference which are perpendicular to the turning direction. The effect is that the wheel can be driven with full force, but will also slide laterally with great ease. These wheels are often employed in holonomic drive systems. A platform employing three omni wheels in a triangular configuration is generally called Kiwi Drive. The Killough platform is similar; so named after Stephen Killough's work with omnidirectional platforms at Oak Ridge National Laboratory. Killough's 1994 design used pairs of wheels mounted in cages at right angles to each other and thereby achieved holonomic movement without using true omni wheels.[1] They are often used in small autonomous robots in intelligent robots research in the academia. In projects such as VEX Robotics, Robocup and FIRST Robotics, many robots use these wheels to have the ability to move in all directions. Omni wheels are also sometimes employed as powered casters for differential drive robots to make turning faster. However, this design is not commonly used as it leads to fishtailing. LINKS Some interesting links: Omniwheels Mecanum wheels Ball transfer unit Holonomic Festo After 15 seconds you can see the Kiwi Drive in action: Control using gamepad ROTACASTER Here's the complete lineup for Rotacaster wheels with LEGO hubs. From left to right: 125mm 48mm 35mm As you can imagine the 125mm version are for heavy duty applications. Since the robot will probably by quite heavy, I figured the bigger the better. There's also a 125mm version with 3 wheels instead of 2. However, this will probably suffice for my robot. The diameter of the 125mm is slightly larger than a 15L liftarm and the width is slightly less than 6L. CONCEPT Here's a simple concept sketch. And an artist impression of how the robot should look like. The end result will probably look nothing like this one, but it's nice to have an idea. PROTOTYPE I have started building the prototype. The idea was to buil in a modular fashion, but this early concept failed miserably. VERSION 2 The triangular shape poses quite a few challenges. Not that I hate a challenge, but I am contemplating on making a four wheeled version. The idea is to create 4 standalone wheel units, which can be attached to a center hub, possibly with shock absorbers. The red liftarms underneath need to be removed, because they will prevent the wheels to be mounted. This is just a simple LDD setup I drew, since we discussed Bob's problem with turntables. That made me rethink my setup. Some turntables and dog bones for the new setup. When using the modular setup for the wheels, I could easily switch between different setups, three or four wheels. My progress is what you see in the pictures. Now let's have fun discussing and mocking. Alasdair mocking in ...3....2....
  6. Hi everyone, I'm Shah, and I like making models using just one Mindstorms kit. As I create new builds I'll add them to this post. Would like to share my latest MOC, a steamboat loosely based on Steamboat Willie. STEAMBOAT WILLI3 by Ahmad Sahar, on Flickr STEAMBOAT WILLI3 by Ahmad Sahar, on Flickr STEAMBOAT WILLI3 by Ahmad Sahar, on Flickr Short video clip and building instructions here. Hope you like it.
  7. The last years, we have used a NXT brick for controlling the train. For Lego World 2017, we want to use EV3 bricks only. Since the RFID sensor is not supported anymore, we needed another way to determine the train location. I have build a proof of concept of a loco: Wheels are directly connected to a EV3 medium motor Location detection based on a color sensor (the combination of yellow, red and green makes a unique pattern) And it works fine! A video of this proof of concept: Of course, the train needs a bit (... ) of restyling ;-) Enjoy, Hans
  8. One of the policies within Sioux.NET on Track, is to change a build every three years. In other words, when a build has been part of a Lego World demo for three years, it should be replaced by a new one. For example, loading the train was first done by the container crane, now it is done by the delta crane. The same applies for the train: the first years, we controlled the train by an NXT, now it is controlled by an EV3. For the new layout, I am thinking of replacing the train by a monorail (and thus renaming the group to "Sioux.NET on Monotrack" ;-). I always use Youtube as inspiration. To see how others solved the typical problems you run into when building something. But I haven't seen a Lego Mindstorms monorail yet. The Lego Technic monorail created by "Osi" (click here for an example) is most nearby for what I have in mind, but it is not using Mindstorms inside. In other words, I will have to use my own imagination. What a pity ;-) I started with creating the track. This was my first attempt: Although it looks good (I was aiming at an open, industrial look), the curve is not smooth enough for a train: So, I made a second attempt: That looks much better. It was not easy to get the curve smooth AND find a brick with the right distance. This is how I managed to get this curve: A simple train (only proof of concept until now), runs easy through the curve: The next days I will continue building a motorized train (proto). Let me know what you think so far Merry Christmas! Regards, Hans
  9. So this is tragic news... the Mindstorms Gallery is closing? Does that mean that I lose all my projects that I uploaded? As if closing the message boards wasn't enough? Fortunately, I have a website, so all of that can be moved... but I still can't believe this is happening. So many memories... And I really dislike the format of the new gallery. It appears as if you can only add pictures, similar to the Technic gallery. That's a huge step backward. What is LEGO doing?
  10. Techster14

    HELP!!!

    I get that this isn't the topic forum to ask this under but, I need help with this idea. so I did research and look for how to use a webcam with ev3 and ev3dev_Python, but couldn't seem to find the camera model I'm using. My camera is literally called usb2.0 pc camera if that helps and have no clue about anything else. it works just fine to the only issue is how do I use any kind of USB camera with EV#Dev_Python?
  11. As part of our fully automated train layout (see more at our blog here: siouxnetontrack.wordpress.com), I have started to build a fully automated container warehouse. The warehouse should be able to store a large number of candy containers. I want to build four rows with shelves to store the containers, served by two robots that can store and retrieve the containers. The first thing I needed is to build the vertical lift for the stacker crane. I looked at other builds and found out that there are three possible mechanisms to create the vertical movement: Gears climbing a toothed bar (element 3743), a nice example can be found here: https://www.youtube.com/watch?v=GToA2tOVyHg Cables pulling the lift up, an example can be found here: https://www.youtube.com/watch?v=rCNwQVjXz60 Chain links, an example that uses the small elements 3711 can be found here: https://www.youtube.com/watch?v=fQIAAb8x8MI And as you may have guessed, I have tried something different. I use the worm gears (element 4716) to get the vertical movement, this is the first test setup: If you stack the elements 4716 on top of each other, they should be aligned correctly to create one, long worm gear. I just finished a first prototype of the stacker crane. The crane has two forks, in order to store or retrieve a container from either the left row or the right row. The lift can move up and down, the (horizontal) movement along the row needs to be build. One EV3 M motor is used to move the forks either to the left or to the right. It uses a color sensor to determine the middle position. One EV3 L motor is used for the vertical movement. A touch sensor is used to detect the bottom position. Watch the video to see a demo: More details will be added later. Enjoy watching and please let me know what you think. Hans
  12. Hi all, A while ago I purchased the EV3Lights Led Controller by Mindsensors. The contoller is powered by a 12V adapter and it plugs into one of the sensor ports of the Mindstorms EV3 brick. To control the strip you need to download an EV3 Block and you are good to go. They even have sample program, which worked instantly! Christmas will never be the same!
  13. This is a new project I just started. As most of my projects it will probably never get completed but will be a good showcase of some ideas for other projects. I usually don't do MOCs, just like to automate things and add some unusual effects. Last two years I've been collecting some monorail parts with the idea of making something monorail-based, with a few 4DBrix parts to control my budget and also to let me control the movement of the train. When LEGO launched the LEGO 75217 Imperial Conveyex Transport I had the idea of using it as a monorail but adding the new Powered Up hub so I can control it with a MINDSTORMS EV3. So this is the first proof of concept: the EV3 pikcs the Conveyex and make it move until an ultrasonic sensor detects it: To connect the monorail motor to the PUp hub I modded a PUp lights cable, soldering an old 9V plug to the power pins (1 and 2) of the cable: This makes the monorail motor be seen as a Light by the Powered Up (and BOOST) hub so it only works with apps that accept Lights but for me it doesn't matter since I intend to use my own bash/python script. But for manual control and my kids pleasure it also works fine with the PUp train handset: Roadmap: - add a micro-motor to the Conveyex to also control the linked chain track - use EV3 motors (or perhaps 4DBrix motors) to control the monorail Y's - sell a kidney to get a few more monorail parts - integrate the monorail circuit in a Star Wars diorama, with the help of a PLUG mate that is an expert in Star Wars universe The MINDSTORMS EV3 is running ev3dev (linux). This allows me to use a Bluetooth USB dongle to talk BLE with the Powered Up hub. And will also allow me to use some gadgets like NFC sensors to detect the train position or IRLink to control some Power Functions automations (like the AT-ST head). Questions and suggestions are welcome.
  14. I built a new ride on vehicle for Brick 2015 at London Excel. It was super popular and I am so tired now (3 day event, 20,000 + people) Uses 10 NTX's 22 motors, rotacaster 125mm wheels! Made in 5 evenings powered by RedBull
  15. In 2018, Sioux.NET on Track was not allowed to show the train layout at Lego World 2018. Fortunately, the Lego store Toypro in Nederweert (NL) offered us the space and opportunity to demo our layout at their place. December 28, 2018 we gave a successful demo to the visitors. You can find pictures at our Flickr page and a video on Youtube. Some facts and figures: The layout at Toypro used a space of approx. 7 x 3 meter. We use a total of 15 Lego Mindstorms EV3 bricks. The EV3 bricks are running (relatively) small programs written in the EV3 programming language. Each brick is only capable of handling the local functionality, e.g. the delta crane can load containers from the conveyor belt to one of the four wagons. It receives a command to do this from the master PC application. Some builds are controlled by two EV3 bricks in Daisy chain modus. We didn't use three bricks in daisy chain because of the buggy firmware :-(. The master PC application is written in Microsoft C# and WPF. It sends commands using the EV3 mailboxes to start a function and to receive status updates. For example, when the train arrives at the Delta crane, the train sends a message to the PC application that is has arrived at the loading area. Next, the PC application waits until the conveyor belt sends a message that a container has arrived at the loading platform. Then the PC application sends a "load wagon" message to the Delta crane. Etc. All the bricks are connected to the PC via USB. Two exceptions: 1) The train is connected using Wifi. 2) The EV3 that controls the air pump, works standalone. Enjoy, Hans
  16. The company I work for (Sioux) is one of the main sponsors of Tech United, the leading World Champion in robot soccer. So for me, it was obvious that we are going to release a Lego Mindstorms version of their robot. It will be available on the market as an extension set to the Home Edition version (art. 31313). The expected release date is december 2018 and it will be exclusively available at the Toypro (web)shop. The price of the extension set will be approx. 100 euro. Please note that you need the Home Edition to build this model. The soccer robot looks like this in real: And this is the version I made: This version is controlled by the infrared sensor plus the corresponding remote control. I'm working on a version with the Pixycam, that will be able to go to the ball autonomously. The omni wheels are the only parts that are not Lego. Please let me know what you think of it. Regards, Hans
  17. Hello everyone, I use we do 2.0 and mindstorms in teaching elementary schools students. Does anyone know if there are any teaching materials? I'm looking for some e learning solutions with buinding instructions? It doesn't matter if materials are free or not!!I thank you in advance for any help!
  18. Very Excited about getting one of these, have been holding off for about 6 months to see when the next generation might come out. Snake robot sounds cool, depth perception will make for some interesting robots. EV3 Retail version EV3 Educational version Check out the Mindstorms Index here on Eurobricks for useful information: Eurobricks Mindstorms Index
  19. Hans Christian Andersen (1805-1875) is probably the most famous Danish author. His fairy tales have been translated into more than 125 languages. This LEGO model contains 24 fairy tales written by Hans Christian Andersen. The LEGO model is built by 3 LEGO fans from Denmark: Anne Mette Vestergård, Helgi Toftegaard and Lasse Vestergård. Watch video: More photos: https://www.flickr.com/photos/117997229@N03/albums/72157697007597470
  20. Needs an update! MINDSTORMS EV3 RETAIL SET STARTER MODELS These robots can be built with the Mindstorms EV3 Retail Set(31313) TRACK3R TRACK3R R3PTAR R3PTAR SPIK3R SPIK3R EV3RSTORM EV3RSTORM GRIPP3R GRIPP3R MINDSTORMS EV3 RETAIL SET FAN MADE BONUS MODELS These robots can be built with the Mindstorms EV3 Retail Set (31313) BANNER PRINT3R – created by Ralph Hempel BOBB3E – created by Kenneth Ravnshøj Madsen DINOR3X – created by Lasse Stenbæk Lauesen EL3CTRIC GUITAR – created by Daniele Benedettelli EV3D4 – created by Vassilis Chryssanthakopoulos EV3GAME – created by Ricardo Oliveira EV3MEG – created by Martyn Boogaarts KRAZ3 – created by Marc André Bazergui MR-B3AM – created by Kenneth Ravnshøj Madsen RAC3TRUCK – created by Laurens Valk ROBODOZ3R – created by Mark Crosbie WACK3M – created by Martyn Boogaarts MINDSTORMS EV3 EDUCATION KIT STARTER MODELS These robots can be built with the Mindstorms EV3 Education Core Set (45544) Building Instructions & Program Description - Education EV3 Starter Gyro Boy Sorter Puppy Robot Arm MINDSTORMS EV3 EDUCATION KIT EXPANSION MODELS These robots can be built with the Mindstorms EV3 Education Core Set (45544) and the Mindstorms EV3 Education Expansion Set (45560)*. See briefings for more information. * Spinner Factory needs 2 EV3 Intelligent Bricks, 2 Color Sensors, 2 Touch Sensors, and ALL six motors. SPINNER FACTORY Project Description (PDF) REMOTE Project Description (PDF) ELEPHANT Project Description (PDF) TANK BOT Project Description (PDF) STAIR CLIMBER Project Description (PDF) ZNAP Project Description (PDF)
  21. Do you know this, http://www.mindsensors.com/ev3-and-nxt/21-multiplexer-for-nxtev3-motors You may have 12 Lego servos with only one EV3.
  22. LEGO MINDSTORMS PARTS AND COMPONENTS Welcome to the Mindstorms Parts and Components topic. Here you can post information or ask questions about parts, components, sensors, etc. I will update the Index of this post when new content is available. WiFi Dongles Technicbricks.com - WiFi Dongle for EV3 Cables Botbench.com - Awesome EV3 Daisy Chain cable Sensors Eurobricks.com - Mindstorms Index
  23. We had great fun with my daughters building the Rubik's cube solver: http://mindcuber.com/. I built the version for NXT 2.0, but I see that there is a version as well for EV3. The same people have build a version powered by a smartphone that has beat the world speed record for solving the Rubik's cube:
  24. MajorAlvega

    LEGO Laser Harp

    Hi again. Another project I showed live last weekend at PLUG Braga BRInCKa 2016 - a LEGO Laser Harp: It uses a Mindstorms EV3 to read the light intensity on 8 color sensors. Each color sensor has a 1mW red laser pointing to it so my instrument has 8 "strings" or "chords" (I use two 3-to-1 input multiplexers in order to achieve 8 sensors). All 8 lasers are controled from one EV3 output. I started with 8 LEGO Power Function LEDs and it worked fine... at dark. But at a live show room I knew it would be impossible to use the LEDs (unless for very very short distances) so I opted for lasers. The EV3 runs ev3dev, a linux distro for the EV3. A python script controls the lasers and reads the sensors, sending their state to a linux laptop where another python script plays the notes on a software MIDI synth (EV3 with ev3dev can play MIDI but has not enough power to polyphonic sound so I had to use this client-server configuration). This allows the "instrument" to scale out so I can had more EV3 and more "strings". I don't know now how to play so during the exhibition my wife, when present, played some 8-note children tunes for the public. I have no live video but I have this one at home, still with LEDs and just 7-chords: Sound still needs some improvements (I'm not controlling note length) and hopefully in a later version I will read hands distance to control note amplitude. I will also use some kind of Human Interface Device to change the MIDI soundfont intrument "on the fly" so the artist can change from an harp to a piano or a drum whenever he/she wants (I'm planning to use LEGO Dimensions ToyPad since I can already read NFC tags with it on the EV3). Some technical details (and code) at my blog.
  25. Well I'm finally back! The footage in this video is at least 1-2 years old, and I've been working on this project for even longer. I'm slowly working on completing this build, but I need your input and suggestions! My work-in-progress Lego Technic Customized Pickup Truck 42029 is being motorized with Mindstorms Ev3. So far, I have much of the chassis built. Two Ev3 Large Motors are used for the drivetrain and one Ev3 Medium Motor for the steering. I also have it set up so that a Lego piston engine can run while the vehicle is driven.