laser

363 Articles

Laser Artistry Hack Chat

March 30, 2020 by 2 Comments

Join us on Wednesday, April 1 at noon Pacific for the Laser Artistry Hack Chat with Seb Lee-Delisle!

It’s hard to forget the first time you see a laser light show. A staple at concerts starting in the 1980s, seeing a green laser lance out over the heads of tens of thousands of screaming fans to trace out an animated figure or pulsating geometric shapes was pure fascination, and wondering how it was all done was half the fun. As we all know now, it was all done with mirrors, tiny and connected to low-inertia galvanometers capable of the twitchiest of movements, yet precise enough to position the beam of light exactly where it needed to be to create the desired illusion. It was engineering, science, and art all wrapped up into one package.

Fast forward to the present day, and laser show technology has certainly advanced. Bulky laser tubes have been replaced by solid-state devices, more colors are available, and galvo designs have improved. The art and artistry of the laserist have grown with the tech, which is where our guest Seb Lee-Delisle comes into his own. We’ve featured some of Seb’s work before, like an Asteroids laser vector display and enormous public laser displays. And now he’ll stop by to talk about how the art and the tech combine in his hands to produce something much greater than the sum of its parts.

join-hack-chatOur Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, April 1 at 12:00 PM Pacific time. If time zones have got you down, we have a handy time zone converter.

Click that speech bubble to the right, and you’ll be taken directly to the Hack Chat group on Hackaday.io. You don’t have to wait until Wednesday; join whenever you want and you can see what the community is talking about.

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LIDAR System Isn’t Just A Rangefinder Anymore

March 24, 2020 by 15 Comments

For any project there’s typically a trade-off between quality and cost,as higher quality parts, more features, or any number of aspects of a project can drive its price up. It seems as though [iliasam] has managed to avoid this paradigm entirely with his project. His new LIDAR system knocks it out of the park on accuracy, sampling, and quality, and somehow manages to only cost around $114 in parts.

A LIDAR system works by sending out many pulses of light in different directions, measuring the reflections of that light as it returns. LIDAR systems therefore improve with higher frequency pulses and faster control electronics for both the laser output and the receiving data. This system manages to be accurate to within a few centimeters and works up to 25 meters all while operating at 15 scans per second. The key was a high-powered laser module which can output up to 75 watts for extremely short times. More details can be found at this page (Google Translate from Russian).

Another bonus from this project is that [iliasam] has made everything available from his GitHub page including hardware specifications, so as long as you have a 3D printer this won’t take long to produce either. There’s even detailed breakdowns of how the laser driving circuitry works, and how there are safety features built in to keep anyone’s vision from accidentally getting damaged. Needless to say, this isn’t just a laser rangefinder module but if you want to see how you can repurpose those, [iliasam] can show you that as well.

Teardown: Cobra XRS 9740 Radar Detector

March 18, 2020 by 46 Comments

Drivers with a lead foot more often than not have Waze open on their phone so they can see if other drivers have spotted cops up ahead. But avoiding a speeding ticket used to involve a lot more hardware than software. Back before the smartphone revolution, that same driver would have had a radar detector on their dashboard. That’s not to say the gadgets are completely unused today, but between their relatively high cost (one of the top rated models on Amazon as of this writing costs over $300) and the inevitable false positives from so many vehicles on the road having their own radar and LIDAR systems, they’ve certainly become a less common sight over the years

The subject of today’s teardown is a perfect example of “Peak Radar Detector”. Manufactured back in 2007, the Cobra XRS 9740 would have been a fairly mid-range entry offering the sort of features that would have been desirable at the time. Over a decade ago, having an alphanumeric display, voice alerts, and a digital compass were all things worth shouting about on the box the thing was sold in. Though looking like some kind of Cardassian warship was apparently just an added bonus.

As the name implies these devices are primarily for detecting radar activity, but by this point they’d also been expanded to pick up infrared lasers and the strobe beacons on emergency vehicles. But false positives were always a problem, so the device allows the user to select which signals it should be on the lookout for. If you were getting some kind of interference that convinced the detector it was being bombarded with IR lasers, you could just turn that function off without having to pull the plug entirely.

But it’s important to remember that this device was built back when people were still unironically carrying around flip phones. Detecting laser and multi-band radars might sound like something pulled from the spec sheet of a stealth fighter jet, but this is still a piece of consumer electronics from more than a decade in the past. So let’s crack it open and take a look at what goes on inside a radar detector that’s only a few years away from being old enough to get its own driver’s license.

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Camera And Code Team Up To Make Impossible Hovering Laser Effect

March 5, 2020 by 18 Comments

Right off the bat, we’ll say that this video showing a laser beam stopping in mid-air is nothing but a camera trick. But it’s the trick that’s the hack, and you’ve got to admit that it looks really cool.

It starts with the [Tom Scott] video, the first one after the break. [Tom] is great at presenting fascinating topics in a polished and engaging way, and he certainly does that here. In a darkened room, a begoggled [Tom] poses with what appears to be a slow-moving beam of light, similar to a million sci-fi movies where laser weapons always seem to disregard the laws of physics. He even manages to pull a [Kylo Ren] on the slo-mo photons with a “Force Stop” as well as a slightly awkward Matrix-style bullet-time shot.  It’s entertaining stuff, and the effect is all courtesy of the rolling shutter effect. The laser beam is rapidly modulated in sync with the camera’s shutter, and with the camera turned 90 degrees, the effect is to slow down or even stop the beam.

The tricky part of the hack is the laser stuff, which is the handiwork of [Seb Lee-Delisle]. The second video below goes into detail on his end of the effect. We’ve seen [Seb]’s work before, with a giant laser Asteroids game and a trick NES laser blaster that rivals this effect.

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On-Demand Manufacturing Hack Chat

March 2, 2020 by 5 Comments

Join us on Wednesday, March 4 at noon Pacific for the On-Demand Manufacturing Hack Chat with Dan Emery!

The classical recipe for starting a manufacturing enterprise is pretty straightforward: get an idea, attract investors, hire works, buy machines, put it all in a factory, and profit. Things have been this way since the earliest days of the Industrial Revolution, and it’s a recipe that has largely given us the world we have today, for better and for worse.

One of the downsides of this model is the need for initial capital to buy the machines and build the factory. Not every idea will attract the kind of money needed to get off the ground, which means that a lot of good ideas never see the light of day. Luckily, though, we live in an age where manufacturing is no longer a monolithic process. You can literally design a product and have it tested, manufactured, and sold without ever taking one shipment of raw materials or buying a single machine other than the computer that makes this magic possible.

As co-founder of Ponoko, Dan Emery is in the thick of this manufacturing revolution. His company capitalizes on the need for laser cutting, whether it be for parts used in rapid prototyping or complete production runs of cut and engraved pieces. Their service is part of a wider ecosystem that covers almost every additive and subtractive manufacturing process, including 3D-printing, CNC machining, PCB manufacturing, and even final assembly and testing, providing new entrepreneur access to tools and processes that would have once required buckets of cash to acquire and put under one roof.

Join us as we sit down with Derek and discuss the current state of on-demand manufacturing and what the future holds for it. We’ll talk about Ponoko’s specific place in this ecosystem, and what role outsourced laser cutting could play in getting your widget to market. We’ll also take a look at how Ponoko got started and how it got where it is today, as well as anything else that comes up.

join-hack-chatOur Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, March 4 at 12:00 PM Pacific time. If time zones have got you down, we have a handy time zone converter.

Click that speech bubble to the right, and you’ll be taken directly to the Hack Chat group on Hackaday.io. You don’t have to wait until Wednesday; join whenever you want and you can see what the community is talking about.

How Does Starlink Work Anyway?

February 20, 2020 by 123 Comments

No matter what you think of Elon Musk, it’s hard to deny that he takes the dictum “There’s no such thing as bad publicity” to heart. From hurling sports cars into orbit to solar-powered roof destroyers, there’s little that Mr. Musk can’t turn into a net positive for at least one of his many ventures, not to mention his image.

Elon may have gotten in over his head, though. His plan to use his SpaceX rockets to fill the sky with thousands of satellites dedicated to providing cheap Internet access ran afoul of the astronomy community, which has decried the impact of the Starlink satellites on observations, both in the optical wavelengths and further down the spectrum in the radio bands. And that’s with only a tiny fraction of the planned constellation deployed; once fully built-out, they fear Starlink will ruin Earth-based observation forever.

What exactly the final Starlink constellation will look like and what impact it would have on observations depend greatly on the degree to which it can withstand regulatory efforts and market forces. Assuming it does survive and gets built out into a system that more or less resembles the current plan, what exactly will Starlink do? And more importantly, how will it accomplish its stated goals?

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Star Wars Themed Laser Badge: All That Is Missing Is The Pew Pew Sound Effect

February 13, 2020 by 9 Comments

In the quest to advance the art of the electronic badge, the boundaries of what is possible to manufacture in small quantities are continually tested. Full-colour PCBs, injection moulding, custom keyboards, and other wow factor techniques have all been tried, leading to some extremely impressive creations. With all this innovation then it’s sometimes easy to forget that clever design and a really good idea can produce an exceptional badge with far more mundane materials.

The 10th InCTF cybersecurity contest held at Amrita, Kerala, India, had a Star Wars themed badge designed by Team bi0s for the event. It takes the form of a Millennium Falcon-shaped PCB, with a NodeMCU ESP8266 board mounted on it, a shift register, small OLED display, and the usual array of buttons and LEDs. The fun doesn’t stop there though, because it also packs a light-dependent resistor and a laser pointer diode that forms part of one of its games. Power for this ensemble comes courtesy of a set of AA cells on its underside.

They took a novel approach to the badge’s firmware, with a range of different firmwares for different functions instead of all functions contained in one. These could be loaded through means of a web-based OTA updater. Aside from a firmware for serial exploits there was an Asteroids game, a Conway’s Game Of Life, and for us the star of the show: a Millennium Cannon laser-tag game using that laser. With this, attendees could “shoot” others’ LDRs, with three “hits” putting their opponent’s badge out of action for a couple of minutes.

Unusually this badge is a through-hole design as a soldering teaching aid, but its aesthetics do not suffer for that. We like its design and we especially like the laser game, we look forward to whatever next Team bi0s produce in the way of badges.

This isn’t the first badge packing a laser we’ve seen, at last year’s Def Con there was a laser synth badge. No laser tag battles though.