Author: Jenny List

3425 Articles

An ESP32 Dev Board As A Framework Laptop Module

July 1, 2023 by 17 Comments

The Framework laptop will no doubt already have caught the eye of more than one Hackaday reader, as a machine designed for upgrade and expansion by its users. One of its key features is a system of expansion modules. The modules are USB-C devices in a form factor that slides into the expansion bays on the Framework Laptop. Framework encourages the development of new modules, which is something [Spacehuhn] has taken on with an ESP32-S3 development board.

The board itself is what you’d expect, the ESP is joined by a multicolor LED and one of those Stemma/Quiik connectors for expansion. The case is handily provided by Framework themselves, and all the files for the ESP32 module can be found in a GitHub repository. We’re guessing it will find application in experimenting with WiFi networks rather than as a standalone microcontroller. Either way, it shows the route for any Framework owners into making their own add-ons. Take a look, we’ve placed the video below the break.

As you might expect we’ve given a lot of coverage to the Framework laptop since its launch, in particular, our colleague [Arya Voronova] is a fan and has shown us many alternative uses for the parts.

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A CVT For Every Application

July 1, 2023 by 36 Comments

When the subject of CVTs or continuously variable transmissions comes up, the chances are that most readers will think of the various motor vehicles they’ve appeared in. Whether it’s a DAF, a Ford, a FIAT, or a Chevrolet, most major manufacturers have tried one at some point or another with greater or lesser success. The automotive ones inevitably use a variation on a V-belt or metal band between variable separation conical pulleys, but this is by no means the only CVT configuration. Serial tinkerer [Robert Murray-Smith] takes an in-depth look at the subject as part of his ongoing fascination with wind turbines.

What caught our eye about this video isn’t so much the final 3D-printed design he selects for his experiments, but the history and his look at the different CVT designs which have appeared over the years. We see the V-belts, as well as the various cone configurations, the disk transmissions, the hydrostatic ones, and even magnetic versions. His transmission uses two cones with a rubber coating, with of all things a movable golf ball between them. We’re guessing it will appear somewhere in his future videos, so watch out for it.

Meanwhile, this isn’t the first time we’ve seen a CVT, [James Bruton] used a hemisphere to make one on a robot.

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Hackaday Prize 2023: Throwaway Temperature Logger To Useful ARM Dev Board

July 1, 2023 by 5 Comments

The global supply chain is a masterpiece of containerized logistics that allows a container to leave a factory in China and arrive on a British forecourt after only a few weeks, but along with the efficiency it brings a traceability and monitoring problem. If you are shipping perishable items such as medicines or foodstuffs, how can you be sure that they’ve remained refrigerated the whole journey through?

The answer comes in digital temperature loggers, and since these are throwaway devices [arduinocelentano] decided to look inside and see if they could be reused. The answer is positive, in that many models have the potential to be useful dev boards for very little money.

These devices usually take the form of a bulky USB dongle with an LCD display and a few buttons. Inside they invariably have a low-power ARM microcontroller and a battery as well as the temperature sensor and some flash memory to store the readings. The data is read by the customer through the USB port, and they’re single use with manufacturers paying only lip service to recycling, because the data must by necessity be impossible to erase or alter. Happily for all that, many of them appear to be well-designed internally, with the relevant debug and programming ports exposed and the ability to access the microcontroller. We look forward to seeing what comes of these boards, because while the worst of the chip shortage my now be receding it’s always good to find a new source.

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An All Sky Camera To Watch The Night Sky

July 1, 2023 by 8 Comments

If you have any astronomer friends you’ll soon discover that theirs is a world of specialist high-quality optical equipment far ahead of the everyday tinkerer, and for mere mortals the dream of those amazing deep space images remains out of reach. It’s not completely impossible for the night sky to deliver impressive imagery on a budget though, as [David Schneider] shows us with a Raspberry Pi powered whole sky camera.

The project was born of seeing a meteor and idly wondering whether meteorite landing sites could be triangulated from a network of cameras, something he quickly discovered had already been done with some success. Along the way though he found the allsky camera project, and decided to build his own. This took the form of a Raspberry Pi 3 and a Pi HQ camera with a wide-angle lens mounted pointing skywards under an acrylic dome. It’s not the Hubble Space Telescope by any means, but the results are nevertheless impressive particularly in a timelapse. We wish there were less light pollution where we live so we could try it for ourselves.

Long-term readers may remember that this isn’t the first Pi sky camera we’ve brought you, for example this one is from 2020.

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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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