You can get cheap no-brand macropads for almost nothing now. Some of them have just a couple of keys. Others have lots of keys, knobs, and LEDs. You can spring for a name brand, and it’ll be a good bet that it runs QMK. But the cheap ones? Get ready to download Windows-only software from suspicious Google Drive accounts. Will they work with Linux? Maybe.
Of course, if you don’t mind the keypad doing whatever it normally does, that’s fine. These are little more than HID devices with USB or Bluetooth. But what do those keys send by default? You will really want a way to remap them, especially since they may just send normal characters. So now you want to reverse engineer it. That’s a lot of work. Luckily, someone already has, at least for many of the common pads based around the CH57x chips.
Setting up a file server can be intimidating to the uninitiated. There are many servers to choose from, and then you need to decide how to install it — Docker? Kubernates? Well, what’s all that then? [9001] has come to the rescue with Copyparty, a full-featured file server in a single Python script.
It’s light enough to run on nearly anything, and getting it running could not be easier: run copyparty-sfx.py, and you’ve got a server. There’s even a 32-bit .exe for older Windows machines — Windows 2000 seems to be the oldest version tested.
Browsers supported: almost all of them.
It’ll connect to anything, both in terms of the variety of protocols supported, and the browsers its web interface loads in. The GitHub documentation says browser support : “Yes”, which is pretty accurate going down the list. Sadly Copyparty’s pages do not work in NCSA Mosaic, but IE4 is A-OK.
There’s, FTP, TFTP, HTTP/HTTPS, WebDAV, SMB/CIFS, with unp/zeroconf/mdns/ssdp, etc etc. You need to check the readme for all features, some of which — like transcoding — are only available when dependencies such as ffmpeg installed on the server. Alternatively you can watch the video embedded below to get walked through the features. If the video whets your appetite, can also visit a read-only Copyparty server being demoed on a NUC sitting in [9001]’s basement.
Over the years we’ve seen plenty of folks create personal servers, but the focus is generally on the hardware side of things. While those with more software experience might prefer to configure the various services involved manually, we can definitely see the appeal of a project like Copyparty. In some ways it’s the inverse of the UNIX Philosophy: instead of doing one thing perfectly, this program is doing everything [9001] could think of, and doing it “good enough”.
As with many cyberdecks, it uses the Raspberry Pi as its powerhouse. There are a couple of nice touchscreens and a decent keyboard, plus the usual ports and some nice programmable controls. These are none of them out of the ordinary for a cyberdeck, but what really shines with this one is the attention to detail in the mechanical design. Those touchscreens rotate on ball bearings, the hinges are just right, the connections to the Pi have quick release mechanisms, and custom PCBs and ribbon cables make distributing those GPIOs a snap.
On top of all that the aesthetics are on point; this is the machine you want to take into the abandoned mining base with you. Best of all it’s all available from the linked GitHub repository, and you can marvel as we did at the video below the break.
Humans have long admired the sound of birdsong, but to fully appreciate how technically amazing it is, you need an ultrasonic microphone. [Benn Jordan] recently created a video about using these microphones to analyze a collection of bird calls, even training a starling to repeat an image encoded in sound, and has some recommendations for amateurs wanting to get started in computational ornithology.
In the first part of the video, [Benn] set up automated ultrasonic recorders at home, made recordings in Florida and rural Georgia, and visited a starling named “The Mouth,” famous for his ability to mimic human sounds. As a demonstration of his abilities, [Benn] drew a simple bird shape in a spectrogram, converted it into sound, and played it for The Mouth several times. Initially, it didn’t seem that the starling would repeat it, but while he was analyzing his recordings later, [Benn] found the characteristic bird shape. The Mouth had been able to repeat it almost pitch-perfectly. It was in this analysis that the ultrasonic microphones showed their worth, since they were able to slow down the birds’ complex vocalizations enough to detect their complex structures without losing audio quality. Continue reading “AVIF: The Avian Image Format”→
From the outside, iron meteorites tend to look like formless, rusted lumps of metal, which is why museums often polish and etch sections to show their interior structure. This reveals their Widmanstätten patterns, a latticework structure of parallel iron-nickel intermetallic crystals which forms over millions of years of very slow solidification. Inspired by this, [Electron Impressions] created his own metal composition which forms similar patterns on a much-faster-than-geological time scale.
Witmanstätten patterns form when a meteorite colliding with a planet launches molten iron and nickel into space, where they very slowly solidify. As the mixture cools, it first forms a stable phase called Taenite, then begins to precipitate another phase called Kamacite. Kamacite forms needle-shaped crystals, which when polished show up against the Taenite background. However, such needle-shaped growth only becomes noticeable at a cooling rate of a few degrees per million years, so it’s not really a practical way to make the pattern. Continue reading “Casting Meteorite-like Materials”→
This GPS Disciplined Oscillator (GPSDO) project uses a Piezo 2940210 10 MHz crystal oscillator which is both oven-controlled (OCXO) and voltage-controlled (VCXO). The GPSDO takes the precision 1 Pulse-Per-Second (PPS) GPS signal and uses it to adjust the 10 MHz crystal oscillator until it repeatedly produces 10,000,000 cycles within one second.
[Wil] had trouble finding all the specs for the 2940210, particularly the EFC sensitivity (S), so after doing some research he did some experiments to fill in the blanks. You can get the gory details in his notes linked above.
PCB business cards are a creative way to show your tech skills while getting your name out there. This take on a PCB business card, sent in by [VCC], tackles one of the big challenges with them: making them in such a way that they are cheap enough to not feel bad about handing them out.
These cards plug into a USB port for power and have over a dozen small LEDs that light up the stars on the front, and a small buzzer that can play over ten minutes of cracktro music. To keep the cost down, [VCC] went with an ATtiny1616 microcontroller costing under 50 cents and still having plenty of outputs to drive the buzzer and LEDs. The final per-unit cost prior to shipping came out to only 1.5 euros, enabling them to be handed out without worrying about breaking the bank.
To aid in the assembly of the cards, [VCC] 3D printed a jig to apply material to the back of the USB connector, building up its thickness to securely fit in the USB port. He also wrote a small script for assembly-line programming the cards, getting the programming process down to around ten seconds per card and letting him turn through prepping the cards. Thanks, [VCC], for sending in your project—it’s a great addition to other PCB business cards we’ve featured.
