Here’s How That Disney 360° Treadmill Works

One thing going slightly viral lately is footage of Disney’s “HoloTile” infinite floor, an experimental sort of 360° treadmill developed by [Lanny Smoot]. But how exactly does it work? Details about that are less common, but [Marques Brownlee] got first-hand experience with HoloTile and has a video all about the details.

HoloTile is a walking surface that looks like it’s made up of blueish bumps or knobs of some kind. When one walks upon the surface, it constantly works to move its occupant back to the center.

Whenever one moves, the surface works to move the user back to the center.

Each of these bumps is in fact a disk that has the ability spin one way or another, and pivot in different directions. Each disk therefore becomes a sort of tilted wheel whose edge is in contact with whatever is on its surface. By exerting fine control over each of these actuators, the control system is able to create a conveyor-belt like effect in any arbitrary direction. This can be leveraged in several different ways, including acting as a sort of infinite virtual floor.

[Marques] found the system highly responsive and capable of faster movement that many would find comfortable. When walking on it, there is a feeling of one’s body moving in an unexpected direction, but that was something he found himself getting used to. He also found that it wasn’t exactly quiet, but we suppose one can’t have everything.

How this device works has a rugged sort of elegant brute force vibe to it that we find appealing. It is also quite different in principle from other motorized approaches to simulate the feeling of walking while keeping the user in one place.

The whole video is embedded just below the page break, but if you’d like to jump directly to [Marques] explaining and showing exactly how the device works, you can skip to the 2:22 mark.

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What Does It Take For A LEGO Car To Roll Downhill Forever?

Cars (including LEGO ones) will roll downhill. In theory if the hill were a treadmill, the car could roll forever. In practice, there are a lot of things waiting to go wrong to keep this from happening. If you’ve ever wondered what those problems would be and what a solution would look like, [Brick Technology] has a nine-minute video showing the whole journey.

The video showcases an iterative process of testing, surfacing a problem, redesigning to address that problem, and then back to testing. It starts off pretty innocently with increasing wheel friction and adding weight, but we’ll tell you right now it goes in some unexpected directions that show off [Brick Technology]’s skill and confidence when it comes to LEGO assemblies.

You can watch the whole thing unfold in the video, embedded below. It’s fun to see how the different builds perform, and we can’t help but think that the icing on the cake would be LEGO bricks with OLED screens and working instrumentation built into them.

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Hackaday Prize 2022: Treadmill Becomes Human-Powered Generator

Running on a treadmill is a great way to workout, but what if the effort you put in could be put to use? This treadmill generator from [Amitabh Shrivastava] does just that.

The build starts with a regular old treadmill, which has a motor inside typically used to power the tread. Instead, the motor’s control electronics were removed, and it was repurposed to work as a generator. The output from the treadmill’s DC motor was fed directly to a DC-DC converter. This was then fed to an inverter that generates 120 V AC, which can power appliances that use up to 20-25W based on [tinkrmind’s] running performance.

It’s a fun way to generate power during a workout. If you don’t want your treadmill’s monitor to die in the middle of a Friends rerun, you’ll have to dig deep on those long runs. We’ve seen similar builds before too, with exercise bikes being a popular method of generating electricity. In fact, that’s [Amitabh]’s next project! Video after the break.

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Rat playing DOOM

Rats Learn To Play DOOM In This Automated VR Arena

When we run an article with “DOOM” in the title, it’s typically another example of getting the venerable game running on some minimalist platform. This DOOM-based VR rig for rats, though, is less about hacking DOOM, and more about hacking the rats.

What started as a side project for [Viktor Tóth] has evolved into quite a complex apparatus. At the center of the rig is an omnidirectional treadmill comprised of a polystyrene ball about the size of a bowling ball. The ball is free to rotate, with sensors detecting rotation in two axes — it’s basically a big electromechanical mouse upside down. The rat rides at the top of the ball, wearing a harness to keep it from slipping off. A large curved monitor sits right in front of the rat to display the virtual environment, which is a custom DOOM map.

With the VR rig built, [Viktor] worked on automating the training. A treat dispenser provides the proper motivation, while powered drive wheels engage with the ball to nudge the rat if it gets stuck in the virtual world. [Viktor] says he has trained three rats — [Romero], [Carmack], and [Tom] — to walk down a straight hallway using this automated method. As for the meat of the game — shooting monsters — [Viktor] has that covered too, with a sensor that detects when a rat rears up on its hind legs to register a shot.

Total training time to get the rats to the point seen in the video was about six weeks, and [Viktor] reports the whole thing cost him about $2000. That’s a lot of time and money, but the results are pretty interesting. If you’re more interested in minimalist DOOM builds, we understand — check out DOOM on a lightbulb, or a thermostat, or even a GPS.

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Treadmill Motor Belt Grinder

Turn Your New Years Resolution Into A Belt Grinder

We’re just over a month into the new year, and some people’s resolve on those exercise plans are already dwindling. There’s some good news though. That treadmill can be hacked into a nice belt grinder for your shop.

[Bob]’s treadmill belt grinder is based on a 2.5 horsepower motor he salvaged from a broken, donated treadmill. This motor needs 130 VDC to run, which is a bit of a challenge to generate. Fortunately, lots of treadmills seem to use the same MC-60 motor controller, which is compatible with this motor. Due to the widespread use of this controller, they can be found on eBay for about $30.

With the motor spinning, [Bob] built up a frame for the grinder, added rollers to hold the belt, and a spring based belt tensioner. The motor’s speed set point is controlled by a potentiometer, and the controller varies the power to keep a constant speed. Since the motor is capable of some serious RPM, a tachometer was added for feedback to prevent high-speed belt shredding.

The final result is a very professional looking tool for under $200. What would a grinder like this be used for? Knives of course! 2″ belt grinders are perfect for shaping and grinding knives and swords. In fact, you can see one in use in this sword hack.

Check out a video of the build after the break.

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Treadmill To Belt Grinder Conversion Worked Out

[Mike] had a bunch of disused fitness machines lying around. Being a skilled welder, he decided to take them apart and put them back together in the shape of a belt grinder.

In particular, [Mike] is reusing the height-adjustment guide rail of an old workout bench to build the adjustable frame that holds the sanding belt. A powerful DC motor including a flywheel was scavenged from one treadmill, the speed controller came from another. [Mike] won’t miss the workout bench: Once you’re welding a piece of steel tube dead-center on a flywheel, as happened for the grinder’s drive wheel, you may call yourself a man (or woman) of steel.

The finished frame received a nice paint job, a little switching cabinet, proper running wheels and, of course, a sanding belt. Despite all recycling efforts, about 80 bucks went into the project, which is still a good deal for a rock-solid, variable-speed belt grinder.

Apparently, disused fitness devices make an ideal framework to build your own tools: Strong metal frames, plentiful adjustment guides, and strong treadmill motors. Let us know how you put old steel to good use in the comments and enjoy [Mike’s] build documentation video below!

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Low Budget Omnidirectional Treadmill

Omni-treadmill

Moving around in space is one of the major hurdles in virtual reality. A holodeck wouldn’t be much fun if you kept walking into walls.  [Gamnaught] is working on a simple solution to this complex problem with his budget omnidirectional treadmill. Omnidirectional treadmills have been around in various forms for a number of years. The idea behind them simple: allow a person walk in any direction without actually changing their position. This is a bit different from the unidirectional treadmill models found at the local gym. Some very complex solutions have been used to create omnidirectional treadmills, including multiple motors and computer control systems as can be found in the US Army omnidirectional treadmill.  [Gamnaught] kept it simple. He built a circular 2×4 platform 13-15 degree bowl. The bowl is covered with carpet, and the user wears furniture sliders on their shoes. The low friction of the sliders allows the user to walk, run, and even walk backwards on the platform. Bungie cords provide resistance so the user doesn’t walk off the platform.

The early results look promising. [Gamnaught] says the balance felt a bit weird at times and took some getting used to. Anyone who has spent time with the Oculus Rift or other VR systems will tell you – many aspects of virtual reality take some getting used to. The treadmill is still open loop, however [Gamnaught] hopes to add motion tracking with a Sixense STEM system. We think a OpenCV based system would work as well. We’ve also seen carpet sliders sold as a children’s toy to be strapped over regular sneakers. Going the toy route would avoid needing a dedicated pair of footwear for the treadmill. More build information can be found on [Gamnaught’s] Reddit thread on the topic.

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