Author: Jenny List

3442 Articles

Rocky Strikes Back At Red Hat

June 30, 2023 by 56 Comments

The world of Linux has seen some disquiet over recent weeks following the decision of Red Hat to restrict source code distribution for Red Hat Enterprise Linux (RHEL) to only their paying customers. We’re sure that there will be plenty of fall-out to come from this news, but what can be done if your project relies upon access to those Red Hat sources?

The Red-Hat-derived Rocky Linux distro relies on access to RHEL source, so the news could have been something of a disaster. Fortunately for Rocky users though, they appear to have found a reliable way to bypass the restriction and retain access to those RHEL sources. Red Hat would like anyone wanting source access to pay them handsomely for the privilege, but the Rocky folks have spotted a way to bypass this. Using readily available cloud images they can spin up a RHEL system and use it to download their sources, and they can do this as an automated process.

We covered this story as it unfolded last week, and it seemed inevitable then that something of this nature would be found, as for all Red Hat’s wishes a GPL-licensed piece of code can’t be prevented from being shared. So Rocky users and the wider community will for now retain access to the code, but will Red Hat strike back? It’s inevitable that there will be a further backlash from the community against any such moves, but will Red Hat be foolhardy enough to further damage their standing in this regard? They’re certainly not the only large distro losing touch with their users.

Forgettable Computer, Great Keyboard. Now Available In USB

June 30, 2023 by 7 Comments

The Coleco Adam is one of the great might-have-beens of the 8-bit home computer era, with an impressive bundle and on-paper spec let down by bugs, hardware issues, and poor availability. It’s something of a footnote today but it seems Coleco did get something right as it had a great keyboard. [Nick Bild] has one, and he’s brought it into the 21st century with a USB interface.

The interfacing is courtesy of a Teensy microcontroller board as in so many other keyboard projects, but what makes this extra-interesting is the way the Coleco keyboard speaks to the world. Instead of merely being a matrix peripheral as were so many of its contemporaries, Coleco created their own custom serial bus for Adam desktop peripherals called AdamNet, and thus the keyboard contains its own 6801 microcontroller to perform the interfacing. The Teensy then is a USB-to-AdamNet interface, and could we’re guessing be made to talk to other Coleco peripherals if they exist.

You can see the keyboard in action below the break, and as you can see it fits quite nicely into 2023.  We’ve not featured much about the Adam before here at Hackaday, but the ColecoVision console which sits at its heart has even seen a new version.

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Much Better VGA From An ESP32

June 28, 2023 by 18 Comments

The ESP32 series from Espressif have been a successful line of products, offering a powerful microcontroller with on-chip wireless networking. There’s a snag though in their practice of calling all of them ESP32s despite wildly varying specifications and even different processor cores, such that it’s easy to lose track of exactly what the chip in front of you can do. [Bitluni] was faced with updating his VGA library to include a newer variant, and was pleasantly surprised to find that it includes a far more capable display peripheral which enables significantly higher resolutions than previously.

The part in question is the ESP32-S3, a version of the chip with the dual Extensa cores we’re familiar with from earlier versions, but the interesting addition of an LCD controller. His previous VGA on ESP32 used the I2S peripheral and sacrificed some of the available bits to create sync pulses, while this version is not only faster but also includes dedicated sync hardware. He can now do up to 16-bit colour in as much as 1024×768 resolution as can be seen in the video below the break, though this feat requires a slightly out of spec framerate that only works on some screens. It’s by no means perfect because the peripheral is intended for LCD rather than VGA use, but it’s pushing microcontroller VGA to new heights and we look forward to any other uses people will put it to.

We covered the original Bitluni ESP32 VGA library when it first appeared.

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Field Testing A Home Made WiFi Antenna

June 28, 2023 by 30 Comments

Most readers will be aware that a good way to extend WiFi range is to use a better antenna for those 2.4 GHz signals, but at the same time such high frequency hijinks have something of a reputation of being not for the faint-hearted. [Dereksgc] puts that reputation to the test by building a helical WiFi antenna — and if that weren’t enough — he also subjects it to a field test. In a real field, is there any other way?

We’ve put both videos below the break, and you can find his helical antenna calculator on his website and the parametric CAD file for the scaffold in his GitHub repository. He first delivers a crash course in the fundamentals of helical antennas before diving into the construction, and even soldering on an impedance matching strip. The field testing involves setting up a base station with an FTP server on a phone, and connecting to it with a variety of antennas over increasing distance across farmland. We’ve characterised antennas in this way before, and it really does give an immediate view of their performance.

In this case the helix comfortably outperforms a commercial patch antenna and a laptop’s internal antenna, making such an antenna a very worthwhile piece of work whether you’re making a fixed link or indulging in a bit of casual wardriving.

The tools mentioned here will make helical antennas a snap, but this isn’t the first time we’ve touched on the subject.

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An ESP In Your Mini TV

June 28, 2023 by 14 Comments

When miniature LCD TVs arrived on the market they were an object of desire, far from the reach of tech-obsessed youngsters. Now in the age of smartphones they’re a historical curiosity, but with the onward march of technology you can have one for not a lot. [Taylor Galbraith] shows us how, with an ESP32 and an LCD we rather like because of its CRT-like rounded corners.

What he’s created is essentially a small media player, but perhaps what makes it of further interest is its migration from a mess of wires on a breadboard to a rather nice PCB. He’s not released the board files at the time of writing, but since the software can all be found in the GitHub repository linked above, we live in hope. On it are not only the ESP and the screen, but also a battery management board, an audio amplifier, and a small speaker. For now it’s a bare board, but we hope he’ll complete it with a neatly designed case for either a pocket player or a retro-styled mini TV. Until then you can see his progress in the videos below the break.

If you’re after more ESP32 media player inspiration, this isn’t the first retro-themed media player we’ve brought you.

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An Android Phone Powers A Self Driving Car

June 27, 2023 by 31 Comments

As auto manufacturers have brought self-driving features to their products, we’re told about how impressive their technologies are and just how much computing power is on board to make it happen. Thus it surprised us (and it might also surprise you too) that some level of self-driving can be performed by an Android phone. [Mankaran Singh] has the full details.

It starts with the realization that a modern smartphone contains the necessary sensors to  perform basic self-driving, and then moves on to making a version of openpilot that can run on more than the few supported phones. It’s not the driver-less car of science fiction but one which performs what we think is SAE level 2 self driving, which is cruise control, lane centering, and collision warning. They take it out on the road in a little Suzuki on a busy Indian dual carriageway in the rain, and while we perhaps place more trust in meat-based driving, it does seem to perform fairly well

Self driving features are codified into a set of levels for an easy reference on what each is capable of doing. We’ve taken a look at it in the past, should you be interested.

Escalate The NERF Arms Race With Self-Firing Missiles

June 27, 2023 by 2 Comments

NERF guns are a toy that appeals to adults and youngsters alike — if you’ve never had the chance to pelt your friends with safe and kid friendly foam darts in a surprise ambush, you haven’t lived. But just as with real-world weapons of the type superpowers put in shows of military strength, there’s an arms race in the world of NERF. Mere darts aren’t enough, and there’s a range of missiles for the bellicose youngster intent on skirting the brink of global foam dart annihilation. These come with a catch though in the shape of a lackluster launcher, and this has prompted [Joel Creates] to create a self-firing NERF missile with a secondary rocket motor.

A supercapacitor stores enough energy to light a small scrap of guncotton explosive when sent through a heater coil, and this should be enough to launch the missile. Perhaps this whole video should sit in “Don’t try this at home kids” territory, but try he does, with multiple dead ends along the way. The final try is a secondary rocket motor inside the missile that’s triggered by a micro switch upon leaving the standard NERF launcher. It’s not a resounding success, but we’re sure you’ll agree it’s an entertaining video to get there.

We’ve featured quite a few NERF hacks over the years, including this large auto-aimer.

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