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Found 184 results

  1. 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.
  2. https://www.hackster.io/contests/alexa-lego-voice-challenge Pretty great.
  3. I'm daysichaining two ev3 bricks, and putting a color sensor on the slave brick, on reflexivity mode. The sensor is connected to port 1 on the slave. The sensor appears as connected, and mostly works, but sometimes it just returns the maximum value (128) for a while, and then returns to reading. How can I fix this? P.S.- the sensor returns 128 even when it shouldn't, e.g. I put it on black and it returns 128.
  4. I wanted to power static Mindstorm builds at shows/events through wall power instead of rechargable AA batteries. I was going to design my own AA battery adapters then I found these on Thingiverse. They came in STL files that can be 3D printed. You only need to print two per Mindstorm unit. They have a nice opening to feed the wires through. AA Battery Eliminator by movotrab: https://www.thingiverse.com/thing:3160060 I had to make a small notch on the battery cover for the wires to come out. From here you connect to a 9V DC wall adapter.
  5. 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.
  6. Built to commemorate the Apollo 11 mission, 50 years ago today.
  7. 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.
  8. 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
  9. 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?
  10. My model of Al-Jazari's Elephant Clock. Hope you like it. Wikipedia article on the original clock. https://en.wikipedia.org/wiki/Elephant_clock Featured on the 1001Inventions website. http://www.1001inventions.com/elephant-clock-lego Pics 01threequarterfront by Ahmad Sahar, on Flickr 06sideview by Ahmad Sahar, on Flickr 07threequarterrear by Ahmad Sahar, on Flickr Video and Building instructions
  11. Hello, I searched the site for MakeCode but came up empty. Has anyone used Microsoft's MakeCode with an EV3? It's an online programming editor similar to Scratch plus Javascript. The highlight for me is EV3 emulation including EV3 peripherals. This appears to be what brick firmware version 1.10E added. Anyone else tried this? Comments?
  12. 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.
  13. 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
  14. 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
  15. This was one of those crazy ideas we have when are discussing with other LUG fellows. This guy from PLUG defied me to show a LEGO robot that translates conversation, much like the C3PO protocol droid from Star Wars. As usual, he wasn't really expecting ti could be possible with LEGO. I only had a couple of hours so I decided to copy a Raspsberry Pi approach of using “the Cloud”. Google offers a one year free trial so I registered and tried a few examples on my Ubuntu laptop, amazing what one can do with just a few curl commands! I wrote a sort of short tutorial. It is now obsolete but helps showing the way for further attempts. I used an USB microphone because I assumed there was no LEGO microphones. But there is - the LEGOCam (MINDSTORMS RCX Vision) has an embedded mic, sound quality isn't great but might (big might) be used - that would make a 100% LEGO hardware solution. By that time I had problems with initial authentication times - it took almost a minute before I can start using the Google services and it needed to be renewed after an hour. EV3 CPU is slow but probably not the only reason here so one of these days I might try it again. Of course, using a Raspberry Pi and a BrickPi would give much better results.
  16. 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.
  17. 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
  18. A Russian roulette style slot machine. Match three colours to win. Play by yourself or with friends. LEGO Mindstorm EV3 Slot Machine by dr_spock_888, on Flickr I made this for the local LEGO Discovery Centre's Adult Night's casino theme night. Originally, it was running on the NXT with limited function. The NXT didn't have the modulus function in the math block. I needed it to calculate where the colors are. I wasn't looking forward to writing my own modulo function then I got lucky and won an EV3 at a silent charity auction. Lo and behold, EV3 math block has a modulo function. I am saved! We also planned to build a working roulette table for the event but that fell through. So I added a "roulette" feature to my MOC. VIDEO: V
  19. 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!
  20. 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.
  21. Hello everybody! I've managed to find in Russia used EV3 for about $100. Upon receiving I'll have 15 minutes to test it and decide whether I want to buy it. My question is how can I effectively test electronic parts without a computer?
  22. After 2 months of work, I can finally present to you, The Zapper! This MOC was quite a challenge to build, not only because it's the biggest thing I've ever built, but because of the numerous design changes that I made while I was building it (most of which you can see in my posts below). I'm just glad I managed to finish it before the deadline, otherwise who knows how many more design changes I would have made... Video: Quick stats: Height (to top of support structure): 30 studs (24cm / 9.45") Width: 32 studs (25.6cm / 10") Depth: 34.5 studs (27.6cm / 10.86") Weight (with batteries and passengers): 1968g Now, you may look at those numbers and think that they're just measurements, but while that is true, there's also quite an amazing coincidence among them... You see, as I was typing it out, I realized that written as grams, the weight was a year - not just any year, but the EXACT year that the original Zipper (which is what The Zapper is based on) was first invented! Unbelievable, I know, but I can assure you that is the exact weight. Links: More about The Zipper: https://en.wikipedia.org/wiki/Zipper_(ride) Bricksafe page: https://bricksafe.com/pages/mocbuild101/tc14---the-zapper YouTube page: https://www.youtube.com/watch?v=kxbVNoT2SOc More photos: All versions (from prototype to final entry): Original post:
  23. I thought I might try to replicate this ride design for this contest. The ride consists of 3 spinning 'rings' with the riders attached to the innermost ring, and the ride rotates them around 3 axes. Some functions I want to include in the ride: Independent motorised control of each spinning ring. All motors external to ride, using a Mindstorms EV3 controlled system. Whole ride raises and lowers to allow riders to get on and off (like in the video) As I want all the motors to be external to the ride (having motors attached to the rings will cause wire entanglement issues) I have to somehow transfer power through the rings to spin the inner ones. Here's a diagram showing how the power will be transferred to spin up the inner rings. Red line is power transmission. Some pictures of the middle (green) ring and a basic mounting frame (not final). Black axle is input and tan axle is output.
  24. A music video for Daft Punk's Harder Better Faster Stronger, with Technic letters, filmed using a GoPro on a custom Mindstorms controlled rig. Made by this guy:https://www.youtube.com/user/fastythefastcat
  25. Hi Eurobrick folks, I would like to present my first Mindstorm Ev3 creation: a combine harvester, which I named C-HARV3ST3R, following the Ev3 terminology. It is more than a year that the project was completed, and it stood for some time on a shelf before I finally made instructions (soon on Rebrickable). I then take the opportunity to present it here: It is remote controlled with the IR beacon, including steering and raising the unloader using the middle button. The header can be raised using a lever on the right side. There are two positions: when down (harvesting mode), the small wheels drive the reel. When up (driving mode), the reel does not turn anymore, and a lever push the touch sensor. The program can therefore "know" whether we are in driving or harvesting mode, based on the state of the touch sensor. The two modes differer by the following: in harvesting mode, the combine harvester drives more slowly and no reverse driving is allowed. In addition, a counter records how much we have harvested, a gauge (in %) is displayed on the screen at the top of the machine (where the actual tank is on real machines). When the tank is full, no further move is allowed and a "bip" is emitted. One need to either go in driving mode, or to unload the harvest by raising the unloader. In driving mode, the combine harvester moves faster and can move reverse (slow speed, emitting a warning "bip"). But a video is maybe better than words: Finally, just a few more pics: Hope you like it!