Kritik sah

According to [ClassicHasClass], the best way to open an Atari Stacy is to not open an Atari Stacy . Apparently, these old computers were not pleasant to work on. The cables were not keyed and were prone to short against things. Screws easily strip out plastic holes. Of course, there wouldn’t be a story if there wasn’t a teardown and an upgrade that you can check out in the post. The Stacy was one of Atari’s earliest portable systems and the first ST portable (that is, STacy). There’s a backlit LCD, a keyboard and trackball, and the usual ports. You could make do with a single floppy or spring for a second floppy or an internal SCSI hard drive. The 8 MHz 68000-based machine would set you back north of $2,300 back in 1989. The original plan was to run the thing on C-cell batteries, but that would give you about 15 minutes of operation. They finally decided it was a luggable — you’d have to plug it into the wall. The battery compartment was there, but empty and glued shut. Apparently,...

In a stunning example of the Bader Meinhoff effect, we’ve recently heard several times this week about events like the “carbage run.” That is, a motoring event where you can only buy some garbage car to compete. In the case of [Robbe Derks], the idea was to take a six-day journey to the polar circle in a car. But not just any car. It had to be at least 20 years old and cost less than €1000. That wasn’t hard enough for [Robbe] and friends. They also decided to make the car self-driving . If you have a car that is new enough, this might not be as hard as it sounds. The OpenPilot project adds L2 self-driving features to about 275 car models. But probably not a 20-year-old junker or, in particular, a 1993 Volvo 940. [Robbe] took up the challenge and is doing a series of blog posts covering how it all worked. Most (or maybe all) cars in 1993 didn’t have actuators for remote steering, so the car needed a transplant from a 2020 Toyota Corolla part. Adaptive cruise control also needed some...

Have you ever thought of giving new buzz to outdated wired alarm systems or saving money while upgrading your home security? The Hornet Nest Alarm Panel, to which hacker [Patrick van Oosterwijck] contributes, does just that. Designed for domotics enthusiasts, it offers 42 sensor zones and seamless integration with Home Assistant and ESPHome. This open-source gem uses the wESP32 board, which combines an ESP32 with Ethernet and Power over Ethernet (PoE) for robust, reliable connectivity. Check out the Crowd Supply campaign for details . So what makes this Hornet Nest special? Besides its hackable nature, it repurposes existing wired sensors, reducing waste and cost. Unlike WiFi-dependent solutions, the PoE-powered ESP32 ensures stable performance, even in hard-to-reach locations. The optional USB programming port is genius—it’s there when you need it but doesn’t clutter the board when you don’t. With its isolated circuits, long-cable safety, and smart Ethernet, WiFi, and Bluetooth comb...

Fresh from AliExpress, [Big Clive] got another fascinating item to tear down: a crane claw , as used in those all too familiar carnival games. These games feature a claw the player moves into position above a pile of toys or other items. Lower the claw gently down in the hopes that it grabs the target item. In a perfect world, the claw will move your prize and deposit it, via a chute, into your waiting hands. Of course, everyone knows that these games are rigged and rely less on skill or luck than the way that they are programmed, but the way that this works is quite subtle, as you can see in the video below. Despite how complex these crane claws may appear, they are simply solenoids, with the metal rod inside providing the claw action. The weight of the rod and claw section opens the claw via gravity. The strength of the claw is thus fully dependent on how strongly the solenoid is being driven, which, as [Clive] demonstrates, depends on the voltage and the duty cycle. At only 12V, t...

There’s a paradox in amateur radio: after all the time and effort spent getting a license and all the expense of getting some gear together, some new hams suddenly find that they don’t have a lot to talk about when they get in front of the mic. While that can be awkward, it’s not a deal-breaker by any means, especially when this Pi Pico SSTV decoder makes it cheap and easy to get into slow-scan television. There’s not much to [Jon Dawson]’s SSTV decoder. Audio from a single-sideband receiver goes through a biasing network and into the Pico’s A/D input. The decoder can handle both Martin and Scottie SSTV protocols, with results displayed on a TFT LCD screen. The magic is in the software, of course, and [Jon] provides a good explanation of the algorithms he used, as well as some of the challenges he faced, such as reliably detecting which protocol is being used. He also implemented correction for “slant,” which occurs when the transmitter sample rate drifts relative to the receiver. F...

The word “algorithm” can sometimes seem like a word designed to scare people away from math classes, much like the words “calculus”, “Fourier transform”, or “engineering exam”. But in reality it’s just a method for solving a specific problem, and we use them all the time whether or not we realize it. Taking a deep dive into some of the ways we solve problems, especially math problems, often leads to some surprising consequences as well like this set of algorithms for performing various calculations using nothing but a checkerboard . This is actually a demonstration of a method called location arithmetic first described by [John Napier] in 1617. It breaks numbers into their binary equivalent and then uses those representations to perform multiplication, division, or to take the square root. Each operation is performed by sliding markers around the board to form certain shapes as required by the algorithms; with the shapes created the result can be viewed directly. This method solves a...

Although ham radio can be an engaging, rewarding hobby, it does have a certain reputation for being popular among those who would fit in well at gated Florida communities where the preferred mode of transportation is the golf cart. For radio manufacturers this can be a boon, as this group tends to have a lot of money and not demand many new features in their technology. But for those of us who skew a bit younger, there are a few radios with custom firmware available that can add a lot of extra capabilities . The new firmware is developed by [NicSure] for the Tidradio TD-H3 and TD-H8 models and also includes a browser-based utility for flashing it to the radio without having to install any other utilities. Once installed, users of these handheld radios will get extras like an improved S-meter and detection and display of CTCSS tones for repeater usage. There’s also a programmer available that allows the radio’s memory channels to be programmed easily from a computer and a remote termi...

All wiring is beautiful, except when it isn’t. But is there anything more lovely to behold than circuit sculpture? Once again, [Mohit Bhoite] has made this process look easy like Sunday morning. This time, he’s created a weather display in the form of a lander . This lander runs on the Particle Photon 2, which connects over Wi-Fi and retrieves the weather forecast for the day, along with sunrise and sunset times and wind conditions. Everything is beautifully displayed on a vertically-oriented Adafruit 170×320 TFT screen. There’s also a pulse-density microphone (PDM) breakout board and a buzzer, and the build is capped off with a red 0805 LED. We’re not sure what the feet are made of, but they sure make this lander cute (and accurate). All the project logs are picture-rich, which is really the most we could ask for when trying to imitate this level of greatness. This is apparently an ongoing project, and we’re excited for the end result, although it looks fairly complete from here. ...

There’s an old joke: What do you get someone who has everything? A place to put it. For hackers like [Christian], everything is a hoard of priceless electronic components. His solution is using small zipper bags, either regular plastic or anti-static. These attach using hook and loop fastener to plastic binder sheets which then live in a binder. Combined with some custom printed labels and a few other tricks, it makes for a nice system, as you can see in the video below. Honestly, we’ve done something similar before, using a binder with little pockets, but the bag and custom labels beat our system. He even has QR codes on some of them to locate data sheets easily. Seems like a barcode for inventory management might have been good, too. Some advice from us. If you are just starting out, this might seem like overkill. But if you start out doing something — this or something else — then ten years from now, you won’t have to be like us and think, “I’d get everything organized, but it ...

The art of writing has become a cluttered one to follow, typically these days through a graphical word processor. There may be a virtual page in front of you, but it’s encumbered by much UI annoyance. To combat this a variety of distraction free software and appliances have been created over the years. But it’s perhaps [Liam Proven]’s one we like the most — it’s a bootable 16-bit DOS environment with a selection of simple text and office packages on board . No worries about being distracted by social media when you don’t even have networking. The zip file, in the releases section of the repository , is based upon SvarDOS, and comes with some software we well remember from back in the day. There’s MS Word 5.5 for DOS, in the public domain since it was released as a Y2K fix, Arnor Protext, and the venerable AsEasyAs spreadsheet alongside a few we’re less familiar with. He makes the point that a machine with a BIOS is required, but those of you unwilling to enable BIOS emulation on a n...

Aside from their ability to operate fairly well in extreme temperatures, lead-acid batteries don’t have many benefits compared to more modern battery technology. They’re heavy, not particularly energy dense, have limited charge cycles, and often can’t be fully discharged without damage or greatly increased wear. With that in mind, one can imagine that a laptop that uses a battery like this would be not only extremely old but also limited by this technology. Of course, in the modern day we can do a lot to bring these retro machines up to modern standards like adding in some lithium batteries to this HP laptop . Simply swapping the batteries in this computer won’t get the job done though, as lead-acid and lithium batteries need different circuitry in order to be safe while also getting the maximum amount of energy out. [CYUL] is using a cheap UPS module from AliExpress which comes with two 18650 cells to perform this conversion, although with a high likelihood of counterfeiting in this...

What do you get when you cross cardboard, deodorant rollers, and a love for retro gaming? A marvel of DIY engineering that brings the arcade classic Puzzle Bobble to life —once again! Do you remember the original Puzzle Bobble aiming mechanism we featured 12 years ago ? Now, creator [TomTilly] has returned with a revamped version, blending ingenuity with a touch of nostalgia. [Tom] truly is a Puzzle Bobble enthusiast. And who could argue that? The game’s simplicty makes for innocent yet addictive gameplay. [Tom]’s new setup recreates Puzzle Bobble’s signature aiming mechanic using surprising materials: deodorant roller balls filled with hot glue (to diffuse LED colours), bamboo skewers, and rubber bands. At its heart is an Arduino UNO, which syncs the RGB LED ‘bubbles’ and a servo-driven aiming arm to the game’s real-time data. A Lua script monitors MAME’s memory locations to match the bubble colours and aimer position. But this isn’t just a static display. [Tom] hints at a version ...

Especially within the world of multi-threaded programming does atomic access become a crucial topic, as multiple execution contexts may seek to access the same memory locations at the same time. Yet the exact meaning of the word ‘atomic’ is also essential here, as there is in fact not just a single meaning of the word within the world of computer science. One type of atomic access refers merely to whether a single value can be written or read atomically (e.g. reading or writing a 32-bit integer on a 32-bit system versus a 16-bit system), whereas atomic operations are a whole other kettle of atomic fish. Until quite recently very few programming languages offered direct support for the latter, whereas the former has been generally something that either Just Worked if you know the platform you are on, or could often be checked fairly trivially using the programming language’s platform support headers. For C and C++ atomic operations didn’t become supported by the language itself until...

We all know that “Can it run Doom ?” is the first question of a hardware hacker. The 1993 first person shooter from id Software defined an entire genre of games, and has since being made open source, appeared on almost everything. Everything, that is, except a Captcha, those annoying “Are you a human” tests where we’re all expected to do a search giant’s image classification for them. So here’s [Guillermo Rauch] with a Doom captcha , in which you must gun down three bad guys to proceed. As a way to prove you’re a human we can’t imagine a more fitting test than indiscriminate slaughter, and it’s interesting to read a little about what goes on behind the scenes. It’s a WebAssembly application as you might have guessed, and while it’s difficult to shake that idea from the early ’90s that you needed a powerful computer to run the game, in reality it shows just how powerful WebAssembly is, as well as how far we’ve come in three decades. We’d prefer a few different entry points instead of...

You know how you can fall down a rabbit hole when you start on a project? [Fabian Bräunlein] and [Luca Melette] were looking at a box on a broken streetlamp in Berlin. The box looked like a relay, and it contained a radio. It was a Funkrundsteueremfänger – a radio controlled power controller – made by a company called EFR. It turns out that these boxes are on many streetlamps in many cities, and like you do, they thought about how cool it would be to make lights blink, but on a city-wide basis. Haha, right? So they bought a bunch of these EFR devices on the used market and started hacking . They did a lot of background digging, and found out that they could talk to the devices, both over their local built-in IR port, but also over radio. Ironically, one of the best sources of help they found in reversing the protocol was in the form of actually pressing F1 in the manufacturer’s configuration application – a program’s help page actually helped someone! They discovered that once they k...

This week, Jonathan Bennett and Rob Campbell talk with Alistair Woodman about FRRouting, the Internet routing suite that helps make all this possible. But also business, and how an open source project turns the corner into a successful way to support programmers. FRR https://github.com/FRRouting/frr https://frrouting.org/ Erlang Ecosystem Foundation https://erlef.org/ Did you know you can watch the live recording of the show Right on our YouTube Channel ? Have someone you’d like us to interview? Let us know, or contact the guest and have them contact us! Take a look at the schedule here . Direct Download in DRM-free MP3. If you’d rather read along, here’s the transcript for this week’s episode . Places to follow the FLOSS Weekly Podcast: Spotify RSS Theme music: “Newer Wave” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License from Blog – Hackaday https://ift.tt/8sD9h4M

If you have access to a laser cutter, we sincerely hope you’re aware of boxes.py . As the name implies, it started life as a Python tool for generating parametric boxes that could be assembled from laser-cut material, but has since become an invaluable online resource for all sorts of laser projects. Plus, you can still use it for making boxes. But even if you’ve been using boxes.py for awhile, you might not know it was actually an entry in the Hackaday Prize back in 2017. Creator [Florian Festi] has kept up with the project’s Hackaday.io page all this time, using it as a sort of development blog, and his recent retrospective on 2024 is a fascinating read for anyone with an eye towards hot photonic action. In it, he describes a bevy of new designs that have come to the site, many of which have been developed either by or in conjunction with the community. For example, a new tool for generating IKEA-like pegboard is sure to be useful for the better organized among us. The last tw...