This DIY Time Server Is More Accurate Than You Need

You almost certainly don’t have an application for the sort of accurate timekeeping that’s made possible by this enhanced version of [Cristiano Monteiro]’s satellite-backed time server. By his own admission, the vast majority of users will be more than happy to have their system’s time synchronized by the traditional Network Time Protocol (NTP). But if you’re really chasing those last few microseconds, that’s where the Precision Time Protocol (PTP) comes in.

With NTP, you can get within 10 milliseconds or so of your upstream time source — but PTP is accurate down to nanoseconds. Unless you’re performing some kind of scientific research, running a robotic assembly line, or perhaps doing high-speed financial trading, there’s no reason for this level of accuracy. In fact, PTP is such a niche technology that until the release of the ESP32-P4, [Cristiano] couldn’t even find an affordable enough chip that supported it.

Hardware-level support for PTP is important as there’s no way to achieve this level of accuracy with software alone, the capability needs to be baked into the Ethernet controller. As you might expect, it takes a highly accurate time source to make the most of PTP, and that’s where the navigation-grade Global Navigation Satellite System (GNSS) receiver comes in. All told the cost of the build is unsurprisingly higher than that of its predecessor, but [Cristiano] says it’s still a couple zeros shy of what a commercial offering would run.

As with his original time server from 2021, [Cristiano] made sure this build was as friendly as possible for hackers and makers. We especially like the 3D printed case designed in OpenSCAD, and his insistence that the gadget have a front panel with blinking status LEDs. Again, the vast majority of us don’t need our clocks to be accurate down to the nanosecond…but it’s nice to know we have the option.

ESP32 Keeps Tabs On Your Local Airspace

We know, we know. Despite being called ESP32-Plane-Radar, this project from [Mateusz Juszczyk] isn’t actually using radar. But thanks to the round LCD this desktop gadget does a fantastic job of recreating a classic radar display, and by pulling in Automatic Dependent Surveillance–Broadcast (ADS-B) data, the visuals even match nearby real-world aircraft.

Perhaps the best part of this project is just how easy it is for others to get in on the action. Although the presentation certainly looks professional — and expensive, if we’re being honest — there’s nothing particularly exotic going on here. Specifically, there’s ESP32-C3 Super Mini behind the scenes cranking through the ADS-B data and pushing it out to a circular GC9A01 display. A minimalistic 3D printed enclosure holds both components, and while it’s undeniably slick as-is, we can’t help but think there’s potential here for more elaborate designs.

As you probably guessed from the lack of a radio in the parts list, the code [Mateusz] provides doesn’t actually sniff ADS-B out of the air. It connects to the local network over WiFi, and then hits adsb.fi to pull in crowdsourced flight data. Since the device has to connect to the network anyway, the code also offers up a web-based configuration interface which puts a little more polish on what’s already an impressive presentation.

We used a round GC9A01 display on the Vectorscope back in 2023, so if anyone ports this over to their old Supercon badge we’d love to see it in action.

Thanks to [Mauricio] for the tip.

It’s Now Imperative That You Copy That Floppy

In the early 1990s, Don’t Copy That Floppy was an anti-piracy campaign that attempted to connect with computer-savvy youth through the power of hip-hop. While somewhat difficult to imagine given our current draconian Digital Rights Management (DRM) hellscape, warning kids about the potential legal ramifications of duplicating floppy disks containing copyrighted software was seen as necessary since at the time there was usually nothing preventing users from simply copying the contents of one disk to another.

Unfortunately 30+ years down the road, we’re now finding that somebody really should have been backing up some of those disks. Which is why the University of Cambridge of launched the Future Nostalgia project and produced Copy That Floppy! — a phenomenal guide on preserving the contents of floppy disks while we still can.

Visualizing a disk’s flux stream can identify debris and damage.

There’s no telling how much data could potentially be lost to time because its stuck on such an antiquated and fragile storage media, and the situation only gets worse with the passage of time. The problem isn’t just that modern computers don’t have floppy drives. The disks themselves degrade with age, a process which is accelerated if they aren’t stored properly.

As such, Copy That Floppy! only briefly touches on the most ideal situation — that is, buying a USB floppy drive and making copies of the bog standard 3.5 inch disks you might come across. It then moves right on into more advanced topics, such as interfacing with less common drive types, how to safely clean floppies, and the use of advanced tools such as Greaseweazle to analyze captured disk images.

We’ve seen demonstrations of some of these techniques before, and a few years back Adafruit got interested in floppy preservation with modern hardware. But in-depth guides like these that pull all that information together into one place are valuable resources.

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Hackaday Links: July 5, 2026

Happy belated July 4th to all the readers from the United States — hopefully you aren’t reading this from a hospital bed after losing a hand or burning off your eyebrows. While we suspect amateur firework shows and their related injuries will be around for many years to come, we did note that many major cities switched over to drone shows this year.

At least on paper, the appeal is obvious. Beyond the fact that drones are safer and quieter than pyrotechnics, they’re also capable of far more complex displays. Good luck trying to draw George Washington’s face in the sky with exploding rockets. But even if it’s a little more than nostalgia, there’s still something about the sights and sounds of fireworks that enthrall audiences. For many, the whole “rockets’ red glare” thing is a bit more meaningful than the “drones’ red LEDs.”

Earlier this week, we brought you news that Sony would stop producing physical PlayStation discs in January 2028. Many gamers are understandably concerned about the long-term implications such a move will have for software ownership, and while the negative reactions online haven’t bothered Sony enough to get them to amend their plans, they have clarified the situation with developers by explaining that games published before the cutoff date aren’t impacted. So if a developer has a hit title that drops in the summer of 2027 and they want to keep cranking out discs, additional orders can still be placed. Not much of a reprieve, but it will give the community a little more time to figure out what comes next.

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Hackaday Podcast Episode 375: Rebuilding Tech On Our Terms And The Hero Nerd

In this episode, Hackaday editors Elliot Williams and Tom Nardi start off by taking a trip down the Raspberry Pi memory lane and then tackle a fresh pile of listener mail. The discussion moves on to hacking bike counter, homebrew upgrades to the Nintendo Entertainment System, and building RAM from whats in the parts bin. You’ll hear about the latest drop-in upgrade for a classic Casio watch, hosting light bulbs that host subversive literature, and loading Wii U games from a weird disk drive from the 1980s. They’ll wrap things up with a dive into the evolving portrayals of brilliant rebels in media, and all the things you can do with a cheap router.

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

Direct download in DRM-free MP3.

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A Custom PCB For The Casio G-Shock

With the PCB fabrication services available to the modern hobbyist, it’s become increasingly common to see replacement boards designed for all sorts of devices. Even so, it’s sometimes still a little difficult to believe that we’re at the point where hardware hackers are now producing advanced replacement PCBs for commercial wristwatches such as this drop-in upgrade for the iconic Casio G-Shock by [David Volovskiy].

Honestly, we’d have been impressed if the thing could just tell the time. But the replacement board combined with the open source firmware brings new capabilities that far exceed anything the G-Shock was capable of originally. The upgraded watch now offers several applications, such as a pedometer and a number of games including simplified versions of Blackjack and Wordle. The watch can tell you the phase of the Moon, calculate sunrise and sunset, and display values pulled from the internal thermometer.

Even if you don’t have a G-Shock in need of a new PCB, [David] has put together a web-based emulator that lets you play around with the firmware. The online tool that lets you visualize how the watch’s LCD is mapped is also very slick. For those interested in getting a board of their own, you can join the project’s Discord server and get your name on the list for an upcoming production run.

If some of this sounds familiar, it’s because [David] based his project on [Joey Castillo]’s Sensor Watch, which is a replacement PCB for the Casio F-91W. With these two projects available for others to build from, one wonders how many other Casio watches might get their own upgraded hardware in the future.

Status Display Keeps Eye On Your Prusa Fleet

Whether you’ve been dragging an old MK2 or MK3 kicking and screaming into the present through the available upgrade paths, or recently picked up a CORE One, pretty much any of the 3D printers still being actively supported by Prusa are able to connect to the network for the purposes of remote monitoring and control. Although their printers can work entirely offline, Prusa offers a smartphone application as well as web interface that makes it easy to keep tabs on all the hot plastic action.

If you’ve got a few Prusa printers on the net and would like a dedicated interface for controlling them, check out this custom firmware for the BigTreeTech K-Touch and Panda Touch devices. These touch screen gadgets were originally intended for controlling printers running Klipper, but thanks to [Nomads Galaxy], they can now talk to Prusa printers either directly over the local network or through the Prusa Connect cloud API with a user interface that mimics the aesthetics of the official offerings.

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