Hamvention 2022: The Reunion Begins Today

May 20, 2022 by Kristina Panos 7 Comments

Calling all hams! Hamvention 2022 is underway and runs through the weekend at the Greene County Fair and Expo Center in Xenia, Ohio. It’s been three long years since Hamvention took place in person, and this year marks the 70th reunion of what has got to be the largest hamfest in the Midwest. If you’re in the area, you don’t want to miss it. You will need a ticket, though, and here are a few places you pick one up.

Indoors, you’ll find six buildings full of commercial vendors. But outside is where the real fun takes place — the flea market. What treasures will you uncover? There’s only one way to find out.

If you want to get into ham radio, there’s no place like a ham fest to kick off your journey. And if you’ve been poring over the ARRL handbook, you’re in luck, because they’re proctoring ham exams for free at the church across the street on Friday and Saturday.

Can’t make it out for whatever reason, but live close to the fairgrounds? Want to get in the mood on your way there? Tune to 1620AM within a five-ish mile radius to hear weather, traffic, and parking info, plus interviews and other assorted radio fun. If you live nowhere near Ohio, don’t despair — they are livestreaming it on YouTube.

[Note: the Hara Arena, pictured in our awesome Joe Kim artwork, is the old home of Hamvention, and was demolished in 2016. Better head off to the Greene County Fairgrounds instead.]

Hackaday Podcast 169: 3D Printing In Vase Mode, Measuring Nanovolts Through Mega DIY, And The Softest Pants Are Software Pants

May 20, 2022 by Kristina Panos 2 Comments

Join Hackaday Editor-in-Chief Elliot Williams and Assignments Editor Kristina Panos as we take a tour of our top hacks from the past week. Elliot brought some fairly nerdy fare to the table this time, and Kristina pines for physical media as we discuss the demise of the iPod Touch, the last fruit-flavored mp3-playing soldier to fall.

But first, we talk about a why-didn’t-I-think-of-that 3D printing hack that leverages vase mode into something structural. We’ll take a look inside a see-through cyberdeck made from laptop parts, marvel over the minuscule voltages that can be picked up with a bit of meticulous meter design, and chew the fat about old rotary phones.

We also put in some overtime discussing a cheap fix for an expensive time card clock part, and rock out to a guitar that can use various things for its resonant cavity. Finally, Elliot questions the difference between software and firmware when it comes to hiding your dirty secrets, and Kristina bloviates about see-through electronics and music appreciation using whatever format you can afford.

Check out the links below if you want to follow along, and as always, tell us what you think about this episode in the comments below!

Direct Download link

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Water Your Plants Just Four Times Per Year

May 19, 2022 by Kristina Panos 20 Comments

While it’s true that some plants thrive on neglect, many of them do just fine with a few ounces of water once a week, as long as the light level is right. But even that is plenty to remember and actually do in our unprecedented times, so why bother trying? [Martin] has solved this problem for us, having given every aspect of automatic plant care a lot of thought. The result of his efforts is Flaura, a self-watering open-source plant pot, and a YouTube channel to go with it.

The 3D-printed pot can easily be scaled up or down to suit the size of the plant, and contains a water reservoir that holds about 0.7 L of water at the default size. Just pour it in through the little spout, and you’re good for about three months, depending on the plant, the light it’s in, and how much ~~current~~ water it draws. You can track the dryness level in the companion app.

Whenever the capacitive soil moisture sensor hidden in the bottom of the dirt detects drought conditions, it sends a signal through the Wemos LOLIN32 and a MOSFET to a small pump, which sends up water from the reservoir.

The soil is watered uniformly by a small hose riddled with dozens of tiny holes that create little low-pressure water jets. This is definitely our favorite part of the project — not just because it’s cool looking, but also because a lot of these types of builds tend to release the water in the same spot all the time, which is. . . not how we water our plants. Be sure to check out the project overview video after the break.

No printer? No problem — you could always use an old Keurig machine to water a single plant, as long as the pump is still good.

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Hackaday Prize 2022: Recycled Tire Table Is Where The Rubber Meets The Road

May 18, 2022 by Kristina Panos 43 Comments

The problem with good inventions is that we usually end up with way too many of that particular widget lying around, which can cause all kinds of problems. Take the car tire, for instance. They were a great invention that helped spell the end of buggy whips and broken wagon wheels. But there are so many used-up tires about today that some people end up burning them in large piles, of all possible things.

Not [Vaibhav], who prefers to turn trash into utilitarian treasures. With little more than an old tire, some jute rope, and four plastic drink bottles, they made a sturdy, low-slung piece of furniture that could be used as a coffee table, a foot stool, or whatever life calls for.

Construction was fairly simple and involved stabilizing the hollow core with a round piece of cardboard glued to either side of the tire. Then came the jute rope and glue artistry, which hides any trace of the foundational materials. Finally, [Vaibhav] glued four plastic bottles to the bottom to act as legs. We think that steel cans would last longer and support more weight, but if plastic bottles are the only option, you could always fill them with dirt or sand.

Transparent Framedeck Is Clearly Capable

May 17, 2022 by Kristina Panos 15 Comments

When the universe tells you to build a cyberdeck, then build a cyberdeck you must. The lucky [Richard Sutherland] got an email from user-serviceable laptop purveyors Framework about the availability of their main board for use as a single-board computer. They agreed to send him a laptop and some extra modules as long as he promised to build something awesome with it. There was just one fabulous caveat: whatever design he came up with had to be released to the public.

[Richard] took this capable board with four USB ports and built an all-in-one that pays homage to the slab-style computers like the TRS-80 Model 100, which [Richard] really wanted as a kid. It looks lovely in layered acrylic and brass, and even though we pretty much always think that see-through is the best design choice you can make, transparency really works here. Tucked into those layers is a custom 36-key split running on an Elite-C microcontroller with Gazzew Boba U4 Silent-but-tactile switches, and a trackball in between. Be sure to take the build tour and check out all the process pictures.

Acrylic looks great and seems great on paper, but what about actual use? [Richard] put rubbery SKUF feet on the front, and a pair of repositionable feet on the back. Not only will it stay in place on the table, but he’ll be able to see the screen better and type at an angle greater than zero.

As cool as it would be to have Framedeck in the apocalypse, it will be hard to hide and could get looted. You might want to build something a bit more concealed.

Printable Fix For Time Card Clock Has Owner Seeing Red Again

May 14, 2022 by Kristina Panos 8 Comments

When [Morley Kert] laid eyes on a working time card-punching clock, he knew he had to have it for a still-secret upcoming project. The clock seemed to work fine, except that after a dozen or so test punches, the ink was rapidly fading away into illegibility. After a brief teardown and inspection, [Morley] determined that the ribbon simply wasn’t advancing as it should.

This clock uses a ribbon cassette akin to a modern typewriter, except that instead of a feed spool and a take-up spool, it has a short length of ribbon that goes around and around, getting re-inked once per revolution.

When a card is inserted, a number of things happen: a new hole is punched on the left side, and an arm pushes the card against the ribbon, which is in turn pushed against the mechanical digit dials of the clock to stamp the card.

Finally, the ribbon gets advanced. Or it’s supposed to, anyway. [Morley] could easily see the shadow of a piece that was no longer there, a round piece with teeth with a protrusion on both faces for engaging both the time clock itself and the ribbon cassette. A simple little gear.

After emailing the company, it turns out they want $95 + tax to replace the part. [Morley] just laughed and fired up Fusion 360, having only caliper measurements and three seconds of a teardown video showing the missing part to go on. But he pulled it off, and pretty quickly, too. Version one had its problems, but 2.0 was a perfect fit, and the clock is punching evenly again. Be sure to check it out after the break.

Okay, so maybe you don’t have a time card clock to fix. But surely you’ve had to throw out an otherwise perfectly good coat because the zipper broke?

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Why Get Dressed When There Are Software Pants?

May 12, 2022 by Kristina Panos 42 Comments

With so many of us working from home over the last two years, it’s really become apparent that people generally dislike sitting all day with pants on. Until such a utopian time when all clothing is considered unisex, and just as many men as women are kicking it in loose, flowing skirts and dresses, you may want to remember to actually wear something on your lower half, uncomfortable though pants may be. But there is another way — you could build [Everything Is Hacked]’s pants filter and continue to be a chaos agent. Check out the video after the break.

That’s right, whether you forego or just forget to dress yourself below the equator, the pants filter has you covered. It works like you might expect — machine learning tracks body landmarks and posture to figure out where your NSFW region is and keep it under wraps.

By default, it blurs everything below the belt, or you can draw on pants if you’re inclined to be in revealing tighty-whities and prefer more coverage. You can adjust the width of the pants to cover the covid-19 you may have put on since 2020, and even change the pants to match your shirt.

We love that [Everything Is Hacked] had the um, gumption to test the pants filter in public at what appears to be a local taco joint. After the first few rounds of weird looks, he switched to a pants moustache to save face.

Want to add even more fun to those boring video calls? Try connecting up some vintage hardware, or install a pull chain to end those sessions with a gesture that won’t get you fired.

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