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Grind Your Welds With Pride, If That’s The Way You Do It
To grind or not to grind? What a question! It all depends on what you’re really trying to show, and in the case of welded joints, I often want to prove the integrity of the weld. My ground-back piece...
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Building A Laser Head With High Speed, High Resolution
A test exposure on cyanotype paper shows off the prototype’s resolution, around 100 microns. Typically, when it comes to scanning a laser, it’s done with galvos or a rotating mirror assembly. However,...
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A Miniature Radio Telescope in Every Backyard
You probably wouldn’t expect to see somebody making astronomical observations during a cloudy day in the center of a dense urban area, but that’s exactly what was happening at the recent 2019...
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The Worst Greenhouse Gasses You Haven’t Heard Of
Carbon dioxide has long drawn the ire of an environmentally-conscious humanity. Released from combustion of fossil fuels, levels of CO2 in the atmosphere are higher now than at any point in the past...
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Creating a Bode Analyzer from a Microcontroller
Electrical engineers will recognize the Bode plot as a plot of the frequency response of a system. It displays the frequency on the x-axis and the phase (in degrees) or magnitude (in dB) on the y-axis,...
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Arm Allows Custom Instructions
We’re surrounded by ARM processors, which enjoy a commanding foothold in the consumer market, especially with portable electronics. However, Arm Holdings has never focused its business model on...
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Daisy Chained Seven Segment Art Display
This seven segment art display makes use of a 81 seven segment red common cathode LED displays. The LEDs are arranged onto 100x100mm boards that each contain an Arduino Nano and 9 seven segment...
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Build This Handy Leak Detector For $1.02
You’ve probably noticed that modern life has become rather complicated, and the projects we cover here on Hackaday have not been immune to the march of progress. We certainly aren’t complaining, but...
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The Blessings And Destruction Wrought By Lead Over Millennia
Everyone one of us is likely aware of what lead — as in the metal — is. Having a somewhat dull, metallic gray appearance, it occupies atomic number 82 in the periodic table and is among the most dense...
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Hang Ten With Help From the Surf Window
Unless you live in a special, unique place like Hawaii or Costa Rica it’s unlikely you’ll be able to surf every day. It’s not easy to plan surf sessions or even surf trips to most locations because...
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How Power Over Ethernet (PoE) Works
A remote Ethernet device needs two things: power and Ethernet. You might think that this also means two cables, a beefy one to carry the current needed to run the thing, and thin little twisted pairs...
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Light Emitting Logic Gates Built From Scratch
What’s the weirdest computer you can think of? This one’s weirder. [Dr. Cockroach] figured out a way to create an inverting NOT gate from just one LED and two resistors (one being a photo-resistor)....
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ESP8266 Unlocks Hidden Features In Sound Bar
It’s no secret that the hardware devices we buy are often more capable than their manufacturer leads on. Features hidden behind firmware locks are a common trick, as it allows companies to sell the...
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Tiny Cube Hosts a Hearty Tube
Tiny PCBAs and glowy VFD tubes are like catnip to a Hackaday writer, so when we saw [hamster]’s TubeCube tube segment driver we had to dig in to learn more. We won’t bury the lede here; let’s enjoy a...
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Hackaday Podcast 041: The “How Not To” Episode of Rebreathers, Chain...
Hackaday Editors Mike Szczys and Elliot Williams shed some light on a true week of hacks. It seems as though all kinds of projects are doing this the “wrong” way this week and its delightful to see...
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Giant LEDs, Ruby Lasers, Hologram Displays, and Other Cool Stuff Seen at...
Hackers from all over Europe descended upon Rome last weekend for the Maker Faire that calls itself the “European Edition”. This three-day event is one of the largest Maker Faires in the world — they...
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Build Your Own Plasma Ball
The simple plasma ball – it graces science museums and classrooms all around the world. It shares a place with the Van de Graaf generator, with the convenient addition of spectacular plasma rays that...
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24 Hours of Temperature Data at a Glance
In an era where we can see the current temperature with just a glance at our smartphones, the classic “Time and Temp” gadget sitting on the desk doesn’t have quite the same appeal. The modern weather...
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Building the world’s best DML speakers for under $115
Flat panel speakers are heavily reliant on the material they’re mounted on for the best acoustic quality. In particular, for DML (distributed mode loudspeaker) speakers, sound is produced through the...
View ArticleHand-Made Drum Carder Gets Wool Ready for Spinning
Making a natural fiber like wool into something useful like a sweater involves a lot of steps. We might be familiar with shearing the sheep, spinning the wool into yarn, or knitting and weaving, but...
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