The build relies on an electrolyzer, splitting water into hydrogen and oxygen gas which is stored in a small tank. This gas can then be released and combusted in a burning stream, creating a weapon with a vague resemblance to a movie-spec lightsaber. With the hydrogen torch burning at temperatures of thousands of degrees, it’s hot enough to melt steel just like in the films.
While the concept of operation is simple, actually building such a device in a handheld size is incredibly difficult. [Alex] highlights key features such as the flashback arrestor that stops the gas tank exploding, and the output nozzle that was carefully designed to produce a surprisingly long and stable flame.
The resulting device only burns for 30 seconds, so you’ve only got a short period of time to do what you need to do. However, unlike previous designs we’ve seen, it doesn’t use any external gas bottles and is entirely self-contained, marking an important step forward in this technology. Video after the break.
Humanity is another step closer to a fantasy-accurate lightsaber thanks to Hackaday alumnus [James Hobson] at Hacksmith. Their proto-saber cuts through (cosplay) stormtrooper armor, (foam) walls, and a (legit!) 1/4″ (6.35mm) steel plate. For so many reasons, we want to focus on the blade and handle. (Video, embedded below.)
The blade is a plasma stream designed for glassworking and burns a propane/oxygen mix with almost no residue, but the “blade” stays in a tight cylinder shape. With a custom PCB hosting a mixing controller, the blade extends and retracts like in the movies. The handle is not a technical marvel; it is an artistic wonder and if you want to see some machining eye-candy, check out the first video after the break. The second video demonstrates just how much damage you can do with a 4000° Fahrenheit tube of portable plasma.
You won’t be dueling anyone just yet, since there is no magnetic field shaping the blade like the ones [Lucas] envisioned. Unfortunately, you can’t block anything more substantial than a balloon sword since solid material will pass right through it, but it will suffer a mighty burn in the process. Lightsabers are a fantasy weapon, but the collective passion of nerds have made it as real as ever, and the Guinness folks give credibility to this build.
The lightsaber is an iconic weapon from the Star Wars franchise, designed in all sorts of shapes and colors. Several fan-made versions have been built as well, quite a few of which use the almost ubiquitous neopixel. [Tirenoth] decided to build his first lightsaber using a series of neopixels, but decided on a unique build method.
Instead of the usual strip of neopixels, [Tirenoth] chose to use a bunch of neopixels in the 5mm LED form-factor. [Tirenoth] soldered each LED’s 5v pins and GND pins to the same pins on the next, rotating each LED 180 degrees, building a tower of pixels. The data in and out pins are soldered to the next (and previous) LED as well. This allows the series of LEDs to be a bit more stable physically, and allows them to be stacked close together, one on top of the other.
To control the neopixels, a Proffieboard is used, an open-source lightsaber controller. The Proffieboard uses an STM32 microcontroller and allows you to hook up LEDs or neopixels as well as a speaker. Its open-source software allows the animation of the pixels and the playing of sounds. It’s designed specifically for lightsaber builds and is programmed via the Arduino IDE.
[Tirenoth] has some nice pictures of the build in process and, of course some nice pics of the final result. He suggests that the blade would be the first to break in battle, though. There’s been a few lightsaber builds over the years, like this lightsaber with rave mode, or this lightsaber made with real lasers.
Lightsabers have enchanted audiences since their appearance in the very first Star Wars film in 1977. Unfortunately, George Lucas hasn’t shared the technology in the years since then with the broader public, so we’re left to subsist on pale imitations. This is just such a build.
The closest human analog to Jedi technology is the laser, and this build uses 8 of them in combination with two LEDs. They’re aimed to coincide at a fixed distance above the hilt. A CO2 bicycle inflater is then used to blow through an e-cigarette to create a fog. This makes the red lasers readily visible to the human eye.
This ersatz lightsaber does have its limitations – fast motion tends to scatter the fog, making it once again invisible, and it’s really at its best held in a vertical orientation. There’s also some divergence beyond the focused point. With that said, it does look somewhat impressive when held still, smouldering away.
There was an endless supply of fantastic projects at Supercon this year, but one whose fit and finish really stood out was [Scott]’s lightsaber. If you were walking around and saw someone with a very bright RGB device with a chromed-out handle hanging off their belt it was probably this, though it may have been hard to look at directly. On the outside, the saber looks like a well-polished cosplay prop, and it is! But when Scott quickly broke down the device into component pieces it was apparent that extra care had been put into the assembly of the electronics.
Like any good lightsaber replica the blade is lit, and wow is it bright. The construction is fairly simple, it’s a triplet of WS2812B LED strips back to back on a triangular core, mounted inside a translucent polycarbonate tube with a diffuser. Not especially unusual. But the blade can be popped off the hilt at a moments notice for easy transport and storage, so the strips can’t be soldered in. Connectors would have worked, but who wants flying wires when they’re disconnecting their lightsaber blade. The answer? Pogo pins! Scott runs the power, ground, and data lines out of the strips and into a small board with slip ring-style plated rings. On the hilt, there is a matching array of pogo pins to pass along power and data. The data lines from all the strips are tied together minimizing the number of connections to make, and the outer two power rings have more than one pin for better current-carrying capacity. A handy side effect is that there is nowhere on the blade where there aren’t LEDs; the strips go down to the very end of the blade where it meets the main board inside the hilt.
The hilt is filled with an assembly of 18650’s and a Teensy mounted with a custom shield, all fit inside a printed midframe. The whole build is all about robust design that’s easy to assemble. The main board is book-ended by perpendicular PCBs mounted to the ends, one at the top to connect to the blade and one at the bottom to connect to a speaker. Towards the bottom there is space for an optional Bluetooth radio to allow remote RGB control.
Scott is selling this as a product but also provides detailed instructions and parts lists for each component. Assembly instructions for the blade are here. The hilt is here. And pogo adapters are on OSH Park here. An overview of the firmware with links to GitHub is here. Check out a walkthrough of the handle assembly and blade attachment after the break!
If you polled science fiction fans on what piece of technology portrayed by the movies that they most desire, chances are pretty good that the lightsabers from the Star Wars franchise would be near the top of the list. There’s just something about having that much power in the palm of your hand and still needing to be up close and personal to fight with it. Plus being able to melt holes in bulkheads is pretty keen, as are the cool sounds.
Sadly, the day we can shape and contain plasma in a blade-shaped field is probably pretty far off, but that didn’t stop [Alan Pan] from trying the next best thing: a handheld plasma-projecting blade. He starts with a basic Jacob’s ladder. We’ve seen many of these before, but the basic idea is to ionize the air between two parallel, vertical conductors; the hot plasma heats the air causing it to rise until it reaches the top and snuffs itself out, starting the process over again at the bottom. His twist is to force the plasma into a sheet between the electrodes with air from a leaf blower, forming a blown-arc plasma. That’s pretty cool looking by itself, but he also stretched the electrodes along razor-sharp wood planer blades, for extra danger. We have to admit that the thing looks pretty intimidating, even if the plasma doesn’t really pack bulkhead-melting thermal power. Check out the results in the video below.
We’d love to see [Alan] make good on his promise to make the whole thing self-contained with an electric ducted fan or mini jet engine. Even as it is, it’s still pretty neat. It’s not really his first lightsaber rodeo, but at least this one doesn’t need butane.
We need to have a talk. As tough a pill as it is to swallow, we have to face that fact that some of the technology promised to us by Hollywood writers and prop makers just isn’t going to come true. We’re never going to have a flux capacitor, actual hoverboards aren’t a real thing, and nobody is going to have sword fights with laser beams.
But just because we can’t have real versions of these devices doesn’t mean we can’t make our own prop versions with a few value-added features, like this cool persistence-of-vision lightsaber. [Luni], better known around these parts as [Bitluni] and for his eponymous YouTube channel where he performs wizardry like turning an ESP32 into a software-defined television station, shows he’s no slouch at more mechanical builds either. The hardware is standard POV fare, with a gyro to sense the position of the lightsaber hilt and an ESP32 to run the long Neopixel strip in the blade. There’s also a LiPo pack and a biggish DC-DC converter; the latter contributes mightily to the look of the prop, with its large heatsinks that stick out from the end of the aluminum tubing hilt. There’s also a small speaker and amp for the requisite sound effects on startup and shutdown, and the position-sensitive thrumming is a nice touch too. Check out the POV action in the video below.