Network Scanner Finds Every Raspberry Pi

April 29, 2026 by Zoe Skyforest 34 Comments

DHCP is great for getting machines on the network with a minimum of fuss. However, it can also make remote administration a pain because you never know which IP you’re supposed to be SSHing into. [Philipp] ran into this problem quite often, so decided to whip up an app to make things easier.

At it’s heart, the app is a simple network scanner—of which many already exist. However, [Philipp] had found that many options on Android were peppered with ads that made them highly undesirable to use. Thus, he whipped up his own, with a particular eye to working with the Raspberry Pi. It’s not uncommon for a hacker to have a few scattered around the home network, and it can be a real chore keeping track of where they all end up in IP land. The scanner can specifically single out the Raspberry Pi boards on the network via MAC-OUI and mDNS detection. Plus, just in case you need it, [Philipp] threw in some GPIO pinouts and electronics calculators just to make the app more useful.

If you’ve been looking for an open-source network scanner without all the ugly junk, this project might just be for you. You can also check out the source over on Github if that’s relevant to your interests. We’ve seen some interesting custom network scanners before, too. If you’re whipping up some fun packet-flinging software of your own, don’t hesitate to notify the tipsline!

Bicycle Tubes Aren’t Just Made Of Rubber Anymore

April 29, 2026 by Zoe Skyforest 47 Comments

For the average rider, inner tubes have been one of the most enduring and unchanging parts of bicycle design over the decades. They’re made of rubber, they have a Schrader or Presta valve, and they generally do an okay job at cushioning the ride.

However, if you’re an above-average rider, or just obsessive about your gear, you might consider butyl rubber tubes rather old hat. Today, there are far fancier—and more expensive—options on the market if you’re looking to squeeze every drip of performance out of your bike.

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Noctua Releases 3D Models, But Please Don’t Try To Dupe The Products

April 29, 2026 by Zoe Skyforest 32 Comments

Noctua wants to make life easier for fans of its…fans. To that end, the company has released a bevy of 3D models across its various product lines, all available to download for free.

If you’re not familiar with the company, Noctua specializes in high-quality cooling systems for the PC market. Its hope is that by freely providing 3D models of its components, it will aid aftermarket companies and DIYers that wish to integrate Noctua fans into their gear. In the company’s own words, these files are made available for “mechanical design, rendering, or animations.” They will let people check things like mountings and fitment without having to have the parts on hand, or to create demo visuals featuring the company’s products.

Don’t get too excited, though, because Noctua has already thought ahead. The company has specifically noted these parts aren’t intended for 3D printing, and critical components like fan blades have modified geometry so as to not compromise the companies IP. You could try and print these models, but they won’t perform like the real thing, and Noctua notes they shouldn’t be used for simulation purposes either. They’re intentionally not accurate to what the company actually sells in that regard.

That isn’t to say Noctua is totally against 3D printing. They have lots of parts available on Printables that they’d love you to try—everything from fan grilles to ducts to anti-vibration pads. Most are useful accessories—the kind of little bits of plastic that make using the products easier—that don’t threaten Noctua’s core product line in the marketplace.

If you’re whipping up a custom PC case and you want to kit it out with Noctua goodies, these models might help you refine your design. It’s funny how it’s such an opposite tactic to that taken by Honda, in terms of embracing the free exchange of 3D models on the open Internet. It’s a move that will surely be appreciated as a great convenience, and we’d love to see more companies follow this fine example.

Thanks to [irox] for the tip!

Compact VGA Output Board For The Pi Pico

April 28, 2026 by Zoe Skyforest 7 Comments

Many microcontrollers can spit out simple analog video signals if that’s something you desire. However, it normally requires a bit of supporting hardware and, of course, the right connectors to work with your other video equipment. [Arnov Sharma] took that into account when whipping up this neat VGA board for the Raspberry Pi Pico.

VGA output in this case is achieved via judicious use of the Pi Pico’s PIO subsystem, which is perfect for clocking out the signals for red, green, and blue along with HSYNC and VSYNC as needed. The Pico slots right into [Arnov’s] custom PCB, which makes it a cinch to hook everything up. Supporting hardware is minimal, requiring just a few resistors between the Pico and the DE-15 VGA connector. There’s also a nice LM317 regulator on board to supply power to everything. [Arnov] also whipped up a modified version of the VGA library from [Pancrea85], which allows the Pico to output VGA in a way that’s more accepted by more recent TFT displays as well as older CRTs. The system is demoed with a few basic Hello, World programs, as well as a neat recreation of Conway’s Game of Life.

If you want to get a Pi Pico hooked up to a big screen quickly, whipping up a board like this is a great way to go. If you’re wanting something more advanced, though, you could always explore DVI and HDMI on the same platform. Video after the break.

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Payphone Tag Is Australia’s New National Sport

April 28, 2026 by Zoe Skyforest 44 Comments

Australia’s payphones are an iconic part of the national landscape, even if they’re not as important as they once used to be. However, they’re having a resurgence of late, in part thanks to a new national pastime—the sport of Payphone Tag!

Created by [Alex Allchin], the game is simple. To play, you first sign up on the website and get your emoji and 5-digit PIN. You then go out and find a payphone, dial the Payphone Tag number, and enter your PIN when prompted. This lets you “capture” the phone, raising your score in the game. If a phone is already captured, no matter—just head out there, dial the number, and key in your own PIN to steal it. You can also push your score even higher by capturing three payphones in a triangle on the map to get bonus points.

It’s a fun geospatial game that’s also free to play, because Telstra made payphone calls free back in 2022. It might cost you a bit to get out to some phones, but there are plenty you can reach with the aid of free public transport at the moment, anyway. Protip—at the time of writing, there are a ton of easy captures to be had on Kangaroo Island. It might just cost you a pretty penny to get out there. Have at it!

We’d love to see some stats from Telstra as to whether this is making a dent in overall payphone usage rates. In any case, there were 800 players in the last 7 days and a full 36,640 captures so far, so a lot is happening out there. We fully expect to see this concept spread to other nations in turn, though it might be less attractive in places where you still need to dig out a coin to make a call.

We’ve featured a few payphone hacks over the years. If you’re doing something rad with these telecommunication devices of yesteryear, we’d love to hear about it on the tipsline.

New Slicer Enables Horizontal Overhangs Without Support

April 28, 2026 by Zoe Skyforest 16 Comments

There’s a rule of thumb when it comes to FDM printing that overhangs are really only possible to an angle of around 45 degrees or so. If you try to squirt out plastic with nothing supporting it, it just goes everywhere. However, a new slicer hopes to enable printing up to 90-degree overhangs with some creative techniques.

The software that enables this is called WaveOverhangs, and currently exists as a fork of OrcaSlicer. The idea is straightforward enough — using unique toolpathing to create rings of deposited material that fasten to those laid down before them in the same layer. Thus as the printer lays down a layer into bare space, the deposited plastic is, ideally, able to fix on to the supported edge. As the next ring is laid down, it grabs on to the cooled ring laid down before it, and so on. The idea is inspired by wave propagation, hence the name. You can see a demonstration of the software in the video below by [Cocoanix 3D Printing].

It’s still a very new technique. The slicer has a whole bunch of knobs to turn and two different algorithms. Get the settings just right and you can print horizontal overhangs successfully. There aren’t exactly presets yet, this is something to explore with trial and error. If you test it out, don’t forget to upload your results to the Community Gallery so the developers can see what works and what doesn’t.

We’ve explored how smart slicers can do amazing things before, too, particularly when it comes to things like bridging.

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Sega Master System Controllers, Now With USB C

April 27, 2026 by Zoe Skyforest 12 Comments

USB wasn’t even a gleam in an engineer’s eye when the Sega Master System hit the market in 1985. Today, we’re up to USB 4 or something, and the USB C connector is becoming a defacto standard for just about everything except desktop computers. [Retrostalgia] is embracing this by mating the control pad from Sega’s first international console with the connector of today.

Naturally, the Sega Master System did not use the Universal Serial Bus to talk to its controllers, so some conversion was in order. That’s achieved with the use of a RP2040 microcontroller, which reads the D-pad and action buttons via its GPIO pins. It then acts as a HID device when plugged into a computer or other USB host, showing up as a simple game controller. This is a particularly easy hack as the Master System controller is so simple, there’s no need to decipher any protocols or anything like that. It’s just about wiring up a few simple buttons. Beyond that, it’s just a matter of hot-gluing the RP2040 into the Master System controller housing, and making some room for the USB C port to sneak out the top. We’d have loved to seen a little extra hackery on this one, perhaps adding some rumble to a controller that was never, ever supposed to have it.

If you want to adapt authentic old controllers to work with modern computers and emulators, this project is a great place to start. It doesn’t get much simpler than the Master System, after all. You can always work your way up to more advanced feats later, like working with the beloved Wavebird. Video after the break.

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