Amazingly Detailed Robotics Ground Vehicle Guide

[Andrey Nechypurenko] has put together an excellent design guide describing the development of his a20 grou1nd vehicle and is open sourcing all the schematics and source code.

20150627_180534One of [Andrey]’s previous designs used a Pololu tracked chassis. But this time he designed everything from scratch. In his first post on the a20, [Andrey] describes the mechanical design of the vehicle. In particular focusing on trade-offs between different drive systems, motor types, and approaches to chassis construction. He also covers the challenges of using open source design tools (FreeCAD), and other practical challenges he faced. His thorough documentation makes an invaluable reference for future hackers.

[Andrey] was eager to take the system for a spin so he quickly hacked a motor controller and radio receiver onto the platform (checkout the video below). The a20s final brain will be a Raspberry Pi, and we look forward to more posts from [Andrey] on the software and electronic control system.

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Hope it’s real: 3D Printing Houses with Bricks

You’ve just got to go with the hype on this one, because it’s obviously not ready for prime time yet. But a few days ago murmurs started circling the net that an Australian inventor had developed a robot capable of building complicated structure from brick all by itself.

bricklaying-robotBefore you go off your rocker… we’re definitely not calling this real. It’s a proof of concept at best, but that doesn’t prevent us from getting excited. How long have you been waiting for robots that can build entire structures on our behalf? We were excited at the prospect of extruding walls of concrete. But this is more like LEGO buildings in the real world. The beast cuts brick to length, conveys each brick along the telescoping arm, and butters them as it lays them in place. At least that’s what the rendered video after the break shows.

We’re hearing about this now because FastBrick Robotics, the company [Mark Pivac] founded and has spent ten years developing the Hadrian project at, was just sold to a company called DMY Capital Limited. Of course they’re going to want to get some press out of the sale.

There is an image of the brick feeder on an existing excavator that frankly looks photoshopped. And some real images like the one seen here and another of the “print head” holding some bricks. But it’s enough to think there’s potential here.

The idea is that the base of the robot is fixed with the arm long enough to reach any part of the structure being built. Precise positioning is achieved by a fixed marker in a different position from the robot. The head triangulates its position using laser range-finding with the marker (having said that we now assume there needs to be more than one marker).

So what do you think? Are we ever going to see this incredibly complicated bucket of awesome producing structures in our neighborhood which the Big Bad Wolf simply cannot blow down?

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Cheap, Easy To Build Robot For beginners

Robotics kits are a great way to get folks , young and old, interested in hacking and learning the basics. Quite often, the cost puts them off – it’s no fun if you mess things up while learning how to put an expensive kit together. Many kits are too polished and that leads to beginners feeling that they’ll never be able to build something complex like a robot. The Shonkbot is what the team at Bristol Hackspace came up with for a robot that is obvious in its working and encouragingly easy to build, even for kids (with supervision).  To that effect, they completely avoided custom PCBs and laser cut bits. The Shonkbot is built from easily available parts and some commonly available materials. They aimed to build it for £5, but managed £15. With proper planning and time, they guess it can be brought down to £10.

The Shonkbot is built using an Arduino Nano, two stepper motors with their drivers, a 3xAA battery box and some bits and bobs. Assembly takes about an hour for a 10-year-old and then they can reprogram it in another workshop or at home. The “frame” of the Shonkbot is an old CD-ROM or DVD disk. Everything is hot glued to this frame. At the centre of the disk, a Sharpie is inserted and the Arduino code then allows the robot to draw on paper. Upgrades include adding an IR LED, a photo transistor and a buzzer to allow the Shonkbot to detect objects, or communicate with other Shonkbots. Build instructions are detailed in this document, and the code is available from the Github repository. Here is a photo album from their first build workshop which was held recently.

Thanks to [Matthew Venn] from the Bristol Hackspace for sending in this tip. Check the robot in action in the video below.

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Walk Your Pet Robot

Anyone who’s ever tried to build a bipedal robot will quickly start pulling their own hair out. There are usually a lot of servos involved, and controlling them all in a cohesive way is frustrating to say the least. [Mark] had this problem while trying to get his robot to dance, and to solve it he built a control system for a simple bipedal robot that helps solve this problem.

[Mark]’s robot has six servo motors per leg, for a total of 12 degrees of freedom. Commands are sent to the robot with an RC radio, and the control board that he built, called the Smart Servo Controller, receives the signals and controls the servos appropriately. There are 14 outputs for servos, operating at 12 bits and 50 Hz each, as well as 8 input channels. The servo controller can be programmed on a computer with user-selectable curves for various behaviors for each of the servos on the project. This eliminates the need to write cumbersome programs for simple robot movements, and it looks like it does a pretty good job!

Full disclosure: [Mark] currently has this project up on Kickstarter, but it is a unique take on complex robot control that could help out in a lot of different ways. Since you don’t need to code anything, it could lower the entry barrier for this type of project, possibly opening it up to kids or school projects. Beyond that, even veterans of these types of projects could benefit by not having to do as much brute-force work to get their creations up and moving around!

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6-Axis Robot Arm 3D Prints A Metal Bridge

Do you remember the MX3D metal printing robot? It’s now capable of 3D printing a metal bridge. Here’s the news release, but it’s in Dutch (translated).

Over one year ago we covered the beginning of the MX3D project, which was a rather ambitious foray into 3D printing in metal with a industrial six-axis ABB robot arm. They had previously done a version using resin (MX3D Resin Printer), but then upgraded the system to use a heavy duty welding machine to deposit various metals.

One year later, they’ve tuned it even more. To show it off they printed a free form standing bridge that people can actually walk across.

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These Are The Droid Controllers You’ve Been Looking For

When I was in the 4th grade our teacher announced that we had a special guest visiting us from somewhere “Far, far away…” As we piled out of the classroom and into to the courtyard, my jaw hit the floor – It was R2D2! The droid started to move around, and made all the noises like the movie. I couldn’t believe what I was seeing. R2D2 was real, and he was right in front of me! (My young mind made the conclusion that if R2D2 was real, then all of Star Wars was real.) I had to turn around to see my friends’ reactions. Unfortunately, it’s at that moment, I saw a middle-aged man, holding a RC transmitter, with antenna extended, standing in the background operating the controls. Sigh. R2 wasn’t real – it’s just a remote-controlled robot. My dreams of becoming a Jedi were forever crushed.

[Chris James] of the R2 Builders Club has been working hard to make a pair of “Stealth RC” controllers to help keep the magic of R2D2 intact.  These dual joystick, 3D printed, hand-held units can be easily hidden in the palm of your hand, or the front pockets of a loose jacket while you operate them. Loaded with features, these tiny controllers use XBee radios to talk to a receiver and custom PCB inside the droid, that in turn, can then control dozens of servos, motors, sound playback and more. Because some R2D2 builds will have dozens and dozens of functions, rather than have a button for each one, [Chris] has programmed in gesture controls in to the unit, so that two controllers and can control several dozen preprogrammed actions. [Chris] hasn’t finalized the design just yet – he still calls it a “beta” build, but so far his documentation is outstanding (PDF) – some of the best we’ve seen.

You can learn more about the R2 Builders Club and the controllers in the video after the break

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