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Found 200 results

  1. dawidmarasek

    [MOC] Pinball 2.0

    Two years ago I presented you my first pinball. Today I want to show the second version, with changeable boards and an interactive Mindstorms board. If you like it please add your support on LEGO Ideas page https://ideas.lego.com/projects/4025655b-7b86-4aeb-bc91-57aa33c862e7
  2. Summarizing: - WeDo 2.0 - Spike Prime - Mindstorms Ev3 I believe that, since their introduction, automation and then coding were supposed to represent the natural evolution of Technic,however they ended to be confined in the educational niche. Moreover, wouldn't have been better, on a marketing level, to avoid the fragmentation in three themes? I understand that there are different ages and costs but I think that Lego could have stuck with only one sub-brand, whatever it was, then proceeding to diversify. A single sub-brand would have increased the exposure, hence the sales. Confusing marketing, wasted opportunities.
  3. Did you know that any standard EV3 brick is capable of controlling the LEDS separately? And that the display is capable of displaying 4 shades of gray? No, this extra functionality is not available via the standard programming environment that Lego provides. But if you use low level programming (I used EV3DEV in combination with C++), you have. See the example below. You can read my article at our blog here: https://siouxnetontrack.wordpress.com/2020/04/25/lego-mindstorms-ev3-with-an-image-with-4-different-shades-of-gray/ Or have a look at the Youtube videos. Enjoy. Hans
  4. This lego GBC module uses the lego Mindstorms EV3 to power the module. It uses a robot arm style mechanism to lift the balls from the previous GBC module to the next one. It is quite reliable and has had almost no issues while I have been testing it. It is quite simple and small for a mindstorms GBC module but it is the first thing that I have ever made and programmed with it. (Do you recommend using the EV3 programming app or Python? I know Python quite well but have not tried using it for mindstorms before) I think it turned out ok for my first MOC using mindstorms, hope to make the next one much more interesting :) Instructions. Photos on Flicker.
  5. I have a small IT class project for school where I have to program an EV3 robot through the small basic extension. I want the robot to play a sound file (a short rsf file) but I don't have access to all of the folders nor do I have access to the EV3 software... The sound file I want to play was made at home using the EV3 software but I can't use the exported rsf in my code for some reason. I have tried several things but without access to all the folders (I can reach several folders but not through the root so I can't reach the sounds folder) and the EV3 software I'm stuck... Can anyone help me with the rsf without saving it in the sounds folder?
  6. dawidmarasek

    EV3 with Scratch

    I'm trying to use EV3 with Scratch. I've posted few videos. Maybe someone will be useful.
  7. I am planning to create new GBC modules in the coming years. It will be a combination of Lego Mindstorms and Lego Technic. So not mindblowing mechanical constructions like Akiyuki, but constructions that can only work because they are controlled by the intelligent Mindstorms brick. My first module that I am trying to build (still unsure if I can make it work), is based on the Planar Parallel Mechanism that I saw on Youtube: I find it really cool how it moves. And I thought: let's build this, and use the grabber (visible from time frame 1:23) to pick up balls at the left side of the GBC module and bring them to the right side. Here is an LDD sketch from the first prototype: And a small movie of the first test. The green markers are there, to put the prototype in the start position. That's my major issue right now: how do I now where the four legs of the mechanism are? Working on that now, will keep you posted. Suggestions and compliments are welcome ;-). Regards, Hans aka Mindstorms GBC
  8. A new video has been uploaded to our Youtube channel. In 2019, lots of new elements have been added to our layout. To name a few: the warehouse, able to store 60 containers with candies, with two independent stacker cranes, the four candy circles, and an updated delivery station. Also brand new is the PC software that connects everything. We have worked hard to get the software working stable and with success. You can see the result in the video. Enjoy the video! -- Hans
  9. Hi. I'm new here but I've been lurking a bit and now I've decided to make a post. I've built a large biped, through multiple iterations in the last 7-8 years. It's a decent build but I've decided I'd like to rebuild it with linear actuators as opposed to all of the current gearing used. Just like I read another poster say in some other thread here, moving the black part of the turn table while keeping the grey part stationary will add a ton of friction. This unit works pretty good, I had it posted on the lego mindstorms site before it shutdown. I also posted it to bricklink as well. I still think it would benefit from LA's, I think there would be less friction and better overall efficiency as opposed to the current 6 turntables driven by one motor. Bricklink Destructor Page I'd like to post pictures and such here but apparently I'm limited to 102.4kb of upload on this post. Please take a look at my post at bricklink and give me some input. There is a .io to take a look at the model. I've also changed the zamor launcher I'm using since I built the digital model. I'm using a standard hailstorm configuration with standard magazines, I've found them to be much more reliable than the design I was using when I build the .io. I've considered building an "agitator" into the zamor mag to prevent ball jams, but the rebuild of the Destructor is priority. Current biped info: Walking: This is achieved by one motor mounted on the bottom center of the biped. It has an 8 tooth gear driving the turntable, which in turn drives another turn table above it and attached to it. The top turntable pulls the legs forward by about 4 studs. The turntable attached to it is responsible for driving the gear inside each leg, which changes the angle of the foot to take the weight while stepping forward. Obviously the legs are synchronized by the motor, as synchronization is very important for this model. Turning: This is achieved by driving a turn table with a worm gear attached to a NXT motor. The is a touch sensor located by a tab in the leg attached to a gear. This is synchronized with when the foot has the weight on it, allowing the sensor to indicate when the foot will be active. At the same time we also know the other foot can rotate back to its original state if it is still in a turned state. Weight: Probably around 1-1.5 kilo Speed: About 40 cm /minute Zamor launchers: Typical hailstorm style launchers. May come back to them once I can work out a way to use linear actuators for the walking portion of the biped. What I was thinking for this build: (Starting from feet up in terms of mechanical workings) First a rough motor idea, I'm using an EV3 to control the machine. Motor 1: Walking/Turning Motor 2: Gear switcher for walking/turning Motor 3: Zamor launchers Motor 4: Maybe instead of switching I could use this motor for turning?? Not sure yet.... Feet: This is where my current turning mechanism is. For a LA driven biped, I was thinking a possible gear switch mechanism to change from walking mode to turn feet mode for turning. Still deciding whether a LA or gear is the better for this. I'm kind of leaning towards gears due to the rotation forces needed for turning the foot. And the difficulty of getting rotational force through the leg down to the foot, while maintaining minimum torque/slop. Walking: I still think one motor driving both legs is best due to the absolute synchronization required. One thing I am considering Is sending two rotational forces through the leg, (if feasible) one to control walking and a gearbox to switch to feet rotation. The second rotation force will operate the gearbox for walking or turning the feet. Possibly I could use the second rotation to send through the leg, knee and down to the foot. Now that I think of it maybe CV joint could do this. Zamor launchers: Maybe they would even benefit from the LA treatment? To be looked into at a later date.... Appreciate any input anyone has. If the link doesn't work the biped is named Destructor. It's on the Bricklink Studio page. Thanks. Edit: For whatever reason the studio page takes forever to load. It eventually does though.
  10. Hi. I was working on my car MOC (with a four-speed gearbox designed by Sariel) and had some unfortunate events happen. As stated in the title, the differential is somehow making the gear ratio higher than I need it. The gear moving the diff is moving at the same speed as the power input, but the wheel hub moves one rotation for every 3/4 rotation that I move the input shaft. Is this differential piece supposed to do this? I want the wheels to move at the same speed as the motor at 4th gear, which brings me to my next problem. I hear rapid-fire clicking noises every time my car is in 3rd and 4th gear. This happened to my other MOCs too, but I was able to solve it. Since the car is to be powered by two EV3 large motors, I actually believe there might be a clutch mechanism in the motors such as in the Technic linear actuators that also make a terrible clicking sound when they move all the way up or down. Whatever it is, I'm open to responses and hope the Eurobricks community could provide an explanation and solution about both of these issues. Here's some pictures, the orange and red pieces in the first pic were for testing the rotations. ' Thank you for your time.
  11. This is a 1:8.3 scale Technic MOC car I am making powered by EV3. Things have been going well until I ran into some space issues with some Large Motors. I wanted them to be vertical, but they were too big, so I'm trying ways to get more space so the motors won't be very visible when I build the exterior. In the right picture, I positioned the motors at an angle to save space, however it may make the rear too long. The maximum room I have (according to blueprints) for the motors is 2.5 inches away from the rear wheels, so I need to save a lot of space or I have to expand the rear. All in all, I have to position the motors where they are not too high or not too far from the rear wheels. I'd thought I post this issue I have because I wonder if there is any other better way to do this. Thanks in advance for any thoughts or advice.
  12. 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
  13. 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.
  14. 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.
  15. 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
  16. 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?
  17. 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.
  18. 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
  19. 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
  20. 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.
  21. 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!
  22. 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 VestergÄrd, Helgi Toftegaard and Lasse VestergÄrd. Watch video: More photos: https://www.flickr.com/photos/117997229@N03/albums/72157697007597470
  23. 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.
  24. 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
  25. 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: