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The Three Shell Mystery Finally Solved!
While we certainly acknowledge the valuable contributions of the open hardware community that help to mitigate the coronavirus crisis, we are also looking forward to the days when people start going...
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Econet – Britain’s Early Educational Network
If you compare the early PC market for the US and the UK, you’ll notice one big difference. While many US schools had Apple computers, there were significant numbers of other computers in schools, as...
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A Thermal Camera with a Vintage Twist
Nowadays we often value the superb design of vintage technology. It is, therefore, laudable when a broken piece of old electronics is given a new purpose. These types of builds are exactly [Martin...
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Dropping a Glider From 18,000 Feet
[Tarik and Kemal] have an objective in mind: to drop a home-made autonomous glider from a high-altitude balloon and safely return it to home. To motivate them, [Tarik] has decided not to cut his hair...
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RGB Kitchen Uses Pots to Stir Up Color
Anyone who has done anything with RGB LEDs knows that their ability to display pretty much any color is somehow both the best and worst thing about them. How do you get it right? How do you make your...
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’54 Motorcycle Saved By Electric Conversion
While it’s nice to be able to fully restore something vintage to its original glory, this is not always possible. There might not be replacement parts available, the economics of restoring it may not...
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Model Rocket Launcher Is So Serious, It Has a Briefcase
What could be more thrilling than launching a complex rocket that you built yourself? For starters, launching it with literally anything better than the stock ignition system would be a step in the...
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Mathematical Proof the Eagle in the USPS Logo is FAST!
The logo for the United States Postal Service is a mean-looking eagle. But a true fluid dynamics geek might look at it and realize that eagle is moving so fast it’s causing a shock wave. But just how...
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Get Back Out There, Robotically
When interacting with reality at a distance is the best course of action, we turn to robots. Whether that’s exploring the surface of Venus, the depths of the ocean, or (for the time being) society at...
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An FPGA And A Few Components Can Make A Radio
There was a time when making a radio receiver involved significant work, much winding of coils, and tricky alignment of circuitry. The advent of Software Defined Radio (SDR) has moved a lot of this...
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Wood and Carbon Rods Used for This Handsome and Effective Microphone
Anyone who was active in the phreaking scene or was even the least bit curious about the phone system back in the Ma Bell days no doubt remembers the carbon capsule microphone in the mouthpiece of...
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A Hoverboard As An Assistive Device
Assistive devices for people with disabilities can make an inestimable difference to their lives, but with a combination of technology, complexity, and often one-off builds for individual needs, they...
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Enforce Social Distancing with High Voltage
When getting parts together for a one-off project, we often find ourselves with some leftovers on hand. Most of the time these things go in the junk drawer, but [Brad] aka [AtomicZombie] was working...
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A Broken Inductor As A Bike Chain Sensor
If you have ever broken the ferrite core of an inductor, you’ll probably sympathize with [Oliver Mattos]. He accidentally stood on a ferrite-cored component, breaking it and rendering it useless. But...
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Hackaday Links: April 19, 2020
While the COVID-19 pandemic at least seems to be on a downward track, the dystopian aspects of the response to the disease appear to be on the rise. As if there weren’t enough busybodies and bluenoses...
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Gain An Understanding of Injection Molding’s Design Gotchas
When it comes to manufacturing, sheet metal and injection molding make the world go ’round. As a manufacturing method, injection molding has its own range of unique design issues and gotchas that are...
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Magnetic Bubble Memory Farewell Tour
There’s something both satisfying and sad about seeing an aging performer who used to pack a full house now playing at a local bar or casino. That’s kind of how we felt looking at [Craig’s] modern-day...
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Roll Your Own Automation with ESPHome
There are several different paths to a smart home, and [Marcus] eventually settled on using ESPHome and ESP8266/ESP32 based devices to create a complete DIY smart home solution which covers his garage...
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Test Unknown Fuses Without Destroying Them
There’s a problem with fuses. On the face of it, testing would seem to be a one-shot deal — exceed the rated current and see if it blows. But once you know the answer, the device is useless. If only...
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Tubes Have Character with a Tek 570
When tubes were king, you could go to a drugstore with a box full of them from your TV. There would be a tester that would tell you what tubes were bad and, of course, you could buy the replacements...
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