Category Archives: laser

Laser Harp Sounds Real Thanks to Karplus-Strong Wave Equation

The harp is an ancient instrument, but in its current form, it seems so unwieldy that it’s a wonder that anyone ever learns to play it. It’s one thing to tote a rented trumpet or clarinet home from school to practice, but a concert harp is a real pain to transport safely. The image below is unrelated to the laser harp project, but proves that portable harping is begging for some good hacks.

Enter this laser harp, another semester project from [Bruce Land]’s microcontroller course at Cornell. By replacing strings with lasers aimed at phototransistors, [Glenna] and [Alex] were able …read more

Continue reading

Posted in harp, Karplus-Strong, laser, Microcontrollers, music, musical hacks, phototransistor, pic32, plucking, vibration, wave equation | Leave a comment

Experiment With Lumia, The Cheap and Easy Way

Light is a wonderful medium for art, and there’s all manner of ways to approach it. We’ve always been huge fans of all that blinks and glows, but there’s a whole wide world of other methods and techniques in the lighting arena. Lumia is one that does not always get a lot of mainstream attention, and so [Adam Raugh] has created this video, sharing both the history of the effect, and various ways to create it yourself. 

Lumia was once used to refer to a broad swathe of artistic lighting, but these days, more commonly refers to effects that create …read more

Continue reading

Posted in laser, laser hacks, laser projector, lighting, lighting effect, lumia | Leave a comment

[Ben Krasnow] Builds a One-Component Interferometer

When we think of physics experiments, we tend to envision cavernous rooms filled with things like optical benches, huge coils in vacuum chambers, and rack after rack of amplifiers and data acquisition hardware. But it doesn’t have to be that way – you can actually perform laser interferometry with a single component and measure sub-micron displacements and more.

The astute viewer of [Ben Krasnow]’s video below will note that in order to use the one component, a laser diode, as an interferometer, he needed a whole bunch of support gear, like power supplies, a signal generator, and a really, really …read more

Continue reading

Posted in laser, laser diode, laser hacks, Laser Interferometry, photodiode, range, vibration | Leave a comment

The Electric Imp Sniffs out California Wildfires

The wildfires in California are now officially the largest the state has ever seen. Over 50,000 people have been displaced from their homes, hundreds are missing, and the cost in property damage will surely be measured in the billions of dollars when all is said and done. With a disaster of this scale just the immediate effects are difficult to conceptualize, to say nothing of the collateral damage.

While not suggesting their situation is comparable to those who’ve lost their homes or families, Electric Imp CEO [Hugo Fiennes] has recently made a post on their blog calling attention to the …read more

Continue reading

Posted in air quality, Electric Imp, environmental monitoring, green hacks, laser, laser hacks, Microcontrollers, pollution, slack, webhook | Leave a comment

Hackaday Links: November 18, 2018

The greatest bit of consumer electronics is shipping and the reviews are out: Amazon’s Alexa-enabled microwave is a capable microwave, but befuddling to the voice-controlled-everything neophyte. Voice controlled everything is the last hope we have for technological innovation; it’s the last gasp of the consumer electronics industry. This is Amazon’s first thing with a built-in voice assistant, and while this is a marginally capable microwave at only 700 Watts — fine for a college dorm, but it’s generally worth shelling out a bit more cash for a 1000 Watt unit — the controls are befuddling. The first iteration is always …read more

Continue reading

Posted in alexa, crowdfunding, electron-beam lithography, etcher, Hackaday Columns, Hackaday links, laser | Leave a comment

DIY Long Distance Laser Telescope Does Some Damage

Here’s a DIY laser rifle which can explode a balloon at around 150 feet (45 meters) as well as some angry chemicals at a similar distance. Since there are plenty of videos of lasers doing that at around a meter, why shouldn’t doing so farther away be easy? Despite what many expect, laser beams don’t remain as straight lines forever. All light diverges over a distance. This makes it hard to create a laser which can do damage from more than around a meter and is why most demonstrations on YouTube are that distance or less.

[Styropyro’s] handheld, DIY laser …read more

Continue reading

Posted in DIY laser, laser, laser gun, laser hacks, telescope | Leave a comment

Laser Arm Cannon Scares More than Metroids

There’s an interesting side effect of creating a popular piece of science fiction: if you wait long enough, say 30 or 40 years, there’s a good chance that somebody will manage to knock that pesky “fiction” bit off the end. That’s how we got flip phones that looked like the communicators from Star Trek, and rockets that come in for a landing on a tail of flame. Admittedly it’s a trick that doesn’t always work, but we’re not in the business of betting against sufficiently obsessed nerds either.

Coming in right on schedule 32 years after the release of  …read more

Continue reading

Posted in cosplay, laser, laser hacks, led hacks, metroid, prop | Leave a comment

Shining a Light on Hearing Loss

When auditory cells are modified to receive light, do you see sound, or hear light? To some trained gerbils at University Medical Center Göttingen, Germany under the care of [Tobias Moser], the question is moot. The gerbils were instructed to move to a different part of their cage when administrators played a sound, and when cochlear lights were activated on their modified cells, the gerbils obeyed their conditioning and went where they were supposed to go.

In the linked article, there is software which allows you to simulate what it is like to hear through a cochlear implant, or you …read more

Continue reading

Posted in auditory, brain, cochlear, Cochlear Implant, hearing, laser, laser hacks, light, listen, Medical hacks, optogenetics, rehabilitation | Leave a comment

Worn Train Rails Get Judged by Laser

[Calango] is a railway technician, and for a school final project created the Rail Wear Surveillance Trolley (RWST) which is a delightfully designed device made mainly from PVC conduit with one job: travel down a segment of train track while shining a green laser onto the rail, and capture camera images. The trolley holds both the laser and the camera at just the right angles for the camera to capture a profile of the rail’s curved surface. The images are sent via Bluetooth to a smartphone for later analysis. Rail wear can be judged by checking how well the profile …read more

Continue reading

Posted in bluetooth, green laser, laser, laser hacks, line laser, rail, serial camera, train track, transportation hacks | Leave a comment

Robert Hall and the Solid-State Laser

The debt we all owe must be paid someday, and for inventor Robert N. Hall, that debt came due in 2016 at the ripe age of 96. Robert Hall’s passing went all but unnoticed by everyone but his family and a few close colleagues at General Electric’s Schenectady, New York research lab, where Hall spent his remarkable career.

That someone who lives for 96% of a century would outlive most of the people he had ever known is not surprising, but what’s more surprising is that more notice of his life and legacy wasn’t taken. Without his efforts, so many …read more

Continue reading

Posted in laser, Original Art, semiconductor, silicon, solid state | Leave a comment