Dodge, The Weird Tripod Robot

[hannu_hell] created Dodge as a “novel design of tripod.” It’s a small robotic device quite unlike anything else we’ve seen of late. It’s intended to be a self-mobile camera platform that can move itself around to capture footage as needed.

Dodge is essentially a two-legged robot with a large flat “foot” in the center. When stationary, it rests on this flat foot. When it needs to move, it can raise this center foot and rest on its two outside legs. If Dodge needs to move, it can crab back and forth in a line with these two legs. If it wants to turn, it can return to resting on its center foot, and pivot about its central axis. It can thus rotate itself and use its two outer legs to move further as needed.

Dodge does all this while carrying an ESP32 Cam module. The idea is that it’s a small mobile tripod platform with a live camera feed. It reminds us of various small monitoring robots from cartoons and anime.

Ultimately, it’s an interesting take on robot locomotion. Rather than walking with two legs or four legs and dynamic stability, it takes full advantage of static stability instead.

We’ve seen some wild roboticized camera rigs over the years. Video after the break.

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TOPS, The DIY Robot Dog, Has Great Moves

We love [Aaed Musa]’s TOPS (Traverser of Planar Surfaces) which is a robot dog with custom-made actuators. The DIY is very strong with this project, and the 3D-printed parts alone took a whopping three weeks to print!

There’s additional detail on the electronics and design of TOPS in the build log of the project’s Hackaday.io page, so check it out because there are all sorts of nice design details, like the feet being cast with a silicone outer layer for better traction. We’ve previously covered [Aaed]’s DIY robotic actuator design which we’re delighted to see is put to excellent use in the finished robot.

Of course, a robot’s hardware and physical design is only part of the battle. In fact, [Aaed] says the software side of things was probably the biggest overall challenge. It takes a lot of work to make walking happen, and the process has in fact been a huge learning experience. [Aaed] already has plenty of ideas for a potential TOPS V2.

[Aaed]’s website has video tours of all stages of design and construction of TOPS, and there’s a GitHub repository for all the design details. To see it all in action, check out the short video rounding up the finished robot, embedded here just under the page break.

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A Compact SCARA Arm Plotter

If you’re unfamiliar with SCARA robots, the acronym stands for Selective Compliance Assembly Robot Arm. This refers to the fact that the arms are rigid in the Z axis but somewhat compliant in the X and Y axes, and that they’re often used for assembly tasks. In any case, you can spend a great deal of money equipping your factory with these robots, or you can build your own for the fun of it. If you’re not endowed with a seven-figure investment for opening a production plant, consider exploring [tuenhidiy’s] project instead.

The build enlists an Arduino Mega as the brains of the operation. It’s paired with a RAMPS controller for running a pair of NEMA 17 stepper motors that actually move the arm in the X-Y plane. Additionally, a tray eject mechanism from a CD/DVD drive is enlisted to act as the Z axis. The frame is assembled from PVC plumbing components and a small amount of aluminium T-slot profile.

The resulting arm isn’t fast in the video we see of the build, but it works as a basic plotter without too much complaint. The benefit of the Z-axis in this case is obvious, as it allows the pen to be lifted off the page where necessary.

We’ve seen plenty of good plotter designs around these parts before, too. Video after the break.

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Rosie The Robot Runs For Real

On the recent 256th episode of the Hackaday podcast, [Kristina] mentioned her favorite fictional robot was Rosie from The Jetsons. [Robert Zollna] must agree since he built a reimagined Rosie and it even caught the notice of mainstream outlet People magazine.

We didn’t find much information outside of the TikTok video (see below; you can use the Guest button if you don’t have an account). However, there were a few clever ideas here. First, the robot mechanism is actually Rosie’s vacuum cleaner. Like a tail wagging a dog, an off-the-shelf floor vac tows the robot body.

Rosie herself is clearly an office chair base with an artistic body. The head rotates, and the mouth appears to open and close, so there’s apparently a little more electronics inside, but that’s nothing you couldn’t throw together with some RC servos and an ESP32.

Some videos cover the build so you might be able to glean more details, but the bite-sized videos aren’t very descriptive even though they are fun to watch. If you thought folks documenting their projects on YouTube was bad, you’re really gonna love the TikTok generation.

We like the look of Rosie, but as a practical matter, we need our robot vac to be smaller, not larger. However, using these off-the-shelf robots as a quick start for a robotics project is reasonable. Especially if you can pick up one cheap. Not that that’s a new idea. They even make stripped-down units with the intent that you don’t want to use them as cleaners.

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The $16 PCB Robot

It is a fun project to build a simple robot but, often, the hardest part these days is creating the mechanical base. [Concrete Dog] has a new open source design for stoRPer that uses a PC board as the base. The board has a Raspberry Pi Pico and motor drivers. The modular design allows you to add to it easily and use custom wheels. The video below shows some treaded wheels and some mechanum wheels with gears.

There are mounting holes for sensors and also a way to put another deck above to hold other circuits, power, or whatever you like. There’s lots you could do with this as a starting point.

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DOOM Runs On Husqvarna’s Robot Lawnmower

DOOM has been ported to a lot of platforms — to the point where the joke is kind of getting old now. Evidence of that is available in the fact that brands are now getting in on the action. Yes, as reported by The Register, you can now officially play DOOM on your Husqvarna’s Automower.

Nice, right? Speedrun it on this interface.

We had to check if this was some kind of joke; indeed, the April release date had us looking at the calendar. However, it seems to be legit. You’ll be able to download a version of DOOM via the Husqvarna Automower Connect App, and play it on the tiny screen of your robot lawnmower. Hilariously, due to the size of the game, Husqvarna notes it “may take up to a week before the game is playable” due to the time it takes the mower to download it, along with a necessary software update.

Controls are simple. The knob on the robot is used for turning left and right, while pressing start lets you run forward. Firing weapons is done by pressing the control knob.

We’ve seen some quality ports before, including an arcade port that was particularly cool. Really, though, at this stage, you have to work harder to impress. Show us DOOM running on a Minuteman launch console or something. Continue reading DOOM Runs On Husqvarna’s Robot Lawnmower”

Compact Cycloidal Drive Lives Inside This Custom Brushless Motor

With the popularity of robot dogs, many people have gotten on the bandwagon and tried building DIY versions. Most of them end up attaching a gearbox to an off-the-shelf brushless motor and call it a day. Not everyone goes that way, though, which is why this internal cycloidal drive actuator caught our eye.

Taking design cues from the MIT Mini Cheetah, [Aaed Musa] approached his actuator from the inside out, literally. His 3D printed cycloidal gearbox is designed to fit inside the stator of a BLDC motor. And not just any BLDC motor, but one built mostly from scratch using a hand-wound — and unwound, and wound again — stator along with a rotor that started as a printed part but was eventually machined from steel. Apart from its fixed ring, the cycloidal drive was mostly 3D printed, with everything fitting nicely inside the stator.

The video below shows the design and assembly process as well as testing of the finished drive. It seems to do really well with speed and positional accuracy, and it delivers a substantial amount of torque. Maybe a little too much, though; testing it with a heavy weight on the end of an arm got the stator coils hot enough to warp the printed parts within. But no matter; this was only a prototype after all. [Aaed] says improvements are in the works, including replacing all the plastic parts with metal ones.

Need a little background on cycloidal drives? They’re pretty cool.

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