Build A Prop For A TV Premiere? Stranger Things Have Happened

May 25, 2022 by Kristina Panos 7 Comments

Some guys get all the breaks. [Guy Dupont] had the honor of building a working, interactive wall-mount landline phone for the red carpet premiere of a certain TV show. The phone was to be an Easter egg inside an 80s-style pizzeria set. About every two minutes the phone would ring, and anyone brave enough to answer would be greeted with either a fake pizza order, an old answering machine message, or a clip from The Show That Cannot Be Mentioned.

So the phone doesn’t work-work, but the nostalgia is strong — picking up the receiver when the phone isn’t ringing results in a dial tone, and button pushing leads to the busy signal. Those old pleasant-but-stern operator recordings would have been cool, but there was only so much time. (Your call cannot be completed as dialed. Please check the number and try again.)

[Guy] used a SparkFun RP2040 to handle input from the DTMF keypad and play the tones, the dial and busy signals, and the various recordings into the ear of the receiver.

Instead of messing around with the high voltage needed to drive the original ringer and bell, [Guy] used a small speaker to play the ringing sound. Everything runs on eight AAs tucked under the keypad, which is stepped down to 5 V.

This project was built under fairly dramatic duress, which makes it that much more exciting to watch the build video after the break. With just five days to get the phone working and in the mail, [Guy] holed up on the floor of his office, his messy mid-move refuge from a house plagued by COVID. Unfortunately, the whole pizzeria thing fell through, so [Guy]’s phone will not get to have its moment on the red carpet. But at least it’s on the site that’s black and white and read all over.

[Guy] is no stranger to the old tech/new spec game. Remember that time he shoehorned Spotify into an iPod Classic?

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Sisyphean Ball Race Robot Toils Gracefully, Magnetically

May 20, 2022 by Kristina Panos 5 Comments

Aren’t ball races and marble runs fun? Wouldn’t they be so much more enjoyable if you didn’t have to climb back up the ladder each time, as it were, and reset the thing? [Johannes] wrote in to tell us about a wee robot with the Sisyphean task of setting a ball bearing on a simple but fun course, collecting it from the end, and airlifting it back to the start of the track.

[Johannes] built this ‘bot to test small-scale resin printing strength as well as the longevity of some tiny linear actuators from Ali that may or may not be available at a moment’s notice. The point was to see how these little guys fared when connected directly to an Arduino or other microcontroller, rather than going the safer route with a motor driver of some kind.

Some things worked well, like the c-clips that keep the axles together, and using quick pulses to release the magnetically-linked ball from the gripper. Other aspects didn’t work out so well. Tiny resin parts do not respond well to force, for starters. And then there’s the actuators themselves. The connections are fragile and the motors are weak, but they vary wildly in quality from piece to piece, so YMMV. Some lose steps, and others occasionally seize. But you wouldn’t know any of that from the graceful movement capture in the video below. Although it appears to be automated, the bot is under remote control because of the motor issues.

Not into ball runs? There are other Sisyphean tasks available, such as moving sand around in the name of meditation.

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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.