Trenton Computer Festival Makes YouTube Debut

April 11, 2022 by Tom Nardi 9 Comments

While it doesn’t have the recognition of DEF CON or even HOPE, the Trenton Computer Festival (TCF) holds the record for the longest continually running computer convention, dating all the way back to 1976. TCF has offered vendor spaces, a swap meet, workshops, and keynote talks for almost as long as the personal computer has existed. But until now, all that knowledge was only available to those in the Northeast US that were willing to follow the itinerant event as its bounced between venues over the decades.

Or at least, that used to be the case. Like many events, TCF was forced to go virtual during the COVID-19 pandemic, which meant for the first time all the talks were actually recorded. Over the weekend, the organizers announced that all of the talks and demonstrations from 2020 and 2021 had been uploaded to a new YouTube channel, opening them up to a global audience.

Two years might not sound like much, especially given the fact that there’s still 40+ years unaccounted for. But thanks to the incredible amount of content that is squeezed into each year’s event, the TCF YouTube channel is currently playing host to more than 80 presentations that run the gamut from live musical performances to deep-dives on the Apollo Guidance Computer and quantum computing. Whatever you’re interests happen to be, there’s a good chance you’ll find a presentation or two that talks about it in this impressive collection.

When we made our last visit to this legendary convention, our only real complaint was the fact that none of the presentations were being recorded. With over 40 talks crammed into a six hour event, attendees couldn’t hope but to see more than a fraction of what was on the schedule. The nature of going virtual obviously made it much easier to preserve all this incredible content for later viewing, but it’s unclear if the organizers will be able to maintain that momentum in 2023 when it’s expected TCF will once again be in-person.

Glow In The Dark Computer Memory Illuminates The Fundamentals

April 11, 2022 by Chris Wilkinson 22 Comments

Computer memory has taken on many forms over the years, from mercury-based delay-line tubes to handwoven magnetic core. These days, volatile storage using semiconductors has become ubiquitous with computing, but what if there was a better way? [Michael Kohn] has been working on a new standard for computer memory that uses glow in the dark stickers.

Clearly we jest, however we’re still mighty impressed by the demonstration. Eight delightful star-shaped phosphorescent stickers represent eight bits of memory, totaling one byte. The glow in the dark material is stuck to the inside of short cylinders, each of which contains a white LED and a phototransistor. The memory array is wired up to an iceFUN FPGA board, which is then connected via level shifters to a Western Design Center MENSCH single board computer.

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Blood Pressure Cuff Hacked Into Water Level Sensor

April 11, 2022 by Al Williams 7 Comments

We often write a post and then learn something new and cool from the comments. The same thing happened when [Andreas] posted a video about monitoring fluid levels. Commenters told him that the best fluid level sensor was a hacked blood pressure monitor. He didn’t know that, and we didn’t either, until we watched his video, below.

It is well-known that an air-tight tube in a tank that is closed at the top and open inside the tank will develop a pressure that corresponds to the liquid level in the tank. This is a common approach when you want the pressure sensor to be far away from the tank in, say, an enclosed building. So why use a blood pressure monitor? Because a common enhancement to the system is to use a pump to pressurize the measurement tube first so the system can tolerate small leaks. The blood pressure monitor has everything you need: a pump, a valve, and a pressure sensor.

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Quick Hacks: Countersinking Screw Heads With 3D Laser Engraving

April 11, 2022 by Dave Rowntree 19 Comments

Here’s a fun quick hack from [Timo Birnschein] about using the 3D laser engraving (or ‘stamp’ engraving) mode of certain laser cutter toolchains to create a handy countersink shape in a laser-cut and engraved workpiece. Since [Timo] uses a small laser cutter to cut out and mark project boards for their electronics builds, having an extra messy, manual countersinking operation with subsequent clean-up seemed like a waste of time and effort, if the cutter could be persuaded to do it for them.

Designs are prepared in Inkscape, with an additional ‘3D engraving’ layer holding the extra processing step. [Timo] used the Inkscape feathering tools to create a circular grayscale gradient, leading up to the central cut hole (cuts are in a separate layer) which was then fed into Visicut in order to drive the GRBL-based machine, However, you could do it with practically any toolchain that supports laser power control during a rastering operation. The results look perfectly fine for regions of the workpiece not on show, at least, but if you’re only interested in the idea from a functional point of view, then we reckon this is another great trick for the big bag of laser hacks.

There have been a great number of laser cutting hacks here over the years, since these tools are so darn useful. The snapmaker machine can be a 3D printer, a CNC cutter and a laser cutter all in one, albeit not too perfect at any of those tasks, but the idea is nice. If you own a perfectly fine 3D printer, but fancy a spot of laser engraving (and you have good eye protection!), then you could just strap a 5W blue diode laser to it and get your fix.

Review: Vizy Linux-Powered AI Camera

April 11, 2022 by Donald Papp 14 Comments

Vizy is a Linux-based “AI camera” based on the Raspberry Pi 4 that uses machine learning and machine vision to pull off some neat tricks, and has a design centered around hackability. I found it ridiculously simple to get up and running, and it was just as easy to make changes of my own, and start getting ideas.

Person and cat with machine-generated tags identifying them — Out of the box, Vizy is only a couple lines of Python away from being a functional Cat Detector project.

I was running pre-installed examples written in Python within minutes, and editing that very same code in about 30 seconds more. Even better, I did it all without installing a development environment, or even leaving my web browser, for that matter. I have to say, it made for a very hacker-friendly experience.

Vizy comes from the folks at Charmed Labs; this isn’t their first stab at smart cameras, and it shows. They also created the Pixy and Pixy 2 cameras, of which I happen to own several. I have always devoured anything that makes machine vision more accessible and easier to integrate into projects, so when Charmed Labs kindly offered to send me one of their newest devices, I was eager to see what was new.

I found Vizy to be a highly-polished platform with a number of truly useful hardware and software features, and a focus on accessibility and ease of use that I really hope to see more of in future embedded products. Let’s take a closer look.

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2022 Hackaday Prize Hack Chat

April 11, 2022 by Dan Maloney 23 Comments

Join us on Wednesday, April 13 at noon Pacific for the 2022 Hackaday Prize Hack Chat with Majenta Strongheart!

Let’s face it: this world is pretty broken right now. From environmental crisis to disease and famine, shortages of just about everything, infrastructure failures, not to mention wars and social breakdown, things are getting pretty hairy out there. While it’s tempting to just curl up and pretend everything is good, that’s probably not going to work as even a short-term plan.

Luckily, we hackers are uniquely positioned for situations like this. After all, we fix stuff, and we’re certainly living in a target-rich environment of stuff that needs fixing. What’s more, nothing gives us as much fulfillment as taking a situation that everyone else thinks is beyond help and turning it into a solved problem.

These are the times that people like us can really shine, and the 2022 Hackaday Prize is the perfect forum for that. With this year’s theme of Sustainability, Resiliency, and Circularity, there’s plenty of scope for all of us to make a contribution. To help us get kicked off, Majenta Strongheart, Head of Design and Partnerships at Supplyframe, will drop by the Hack Chat with all the details on this year’s Prize.

Come prepared to pick her brain on how the Prize is going to work this year, find out about the different challenge opportunities, and learn everything there is to know about this year’s competition. It’s the Greatest Hardware Design Challenge on Earth, and we need it now more than ever.

Our Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, April 13 at 12:00 PM Pacific time. If time zones have you tied up, we have a handy time zone converter.

A Pi Pico connected to a MYIR Z-turn board with a set of jumper wires

Need A JTAG Adapter? Use Your Pico!

April 11, 2022 by Arya Voronova 9 Comments

JTAG is a powerful interface for low-level debugging and introspection of all kinds of devices — CPUs, FPGAs, MCUs and a whole lot of complex purpose-built chips like RF front-ends. JTAG adapters can be quite obscure, or cost a pretty penny, which is why we’re glad to see that [Adam Taylor] from [ADIUVO] made a tutorial on using your Pi Pico board as a JTAG adapter. This relies on a project called XVC-Pico by [Dhiru Kholia], and doesn’t require anything other than a Pi Pico board itself — the XVC-Pico provides both a RP2040 firmware implementing the XVC (Xilinx Virtual Cable) specification and a daemon that connects to the Pico board and interfaces to tools like Vivado.

First part of the write-up is dedicated to compiling the Pico firmware using a Linux VM. There’s a pre-built .uf2 binary available in the GitHub repo, however, so you don’t have to do that. Then, he compiles and runs a daemon on the PC where the Pico is connected, connects to that daemon through Vivado, and shows successful single-stepping through code on a MYIR Z-turn board with a Xilinx XC7Z020. It’s worth remembering that, if your FPGA’s (or any other target’s) JTAG logic levels are 1.8V or 2.5V-based, you will need a level shifter between it and the Pi Pico, which is a board firmly in the 3.3V realm.

You just cannot beat the $3 price and the ease of setup. Pi Pico is shaping up to be more and more of a hardware multi-tool. Just a month ago, we covered how the Pico can work as a logic analyzer. A lot of that, we have the PIO peripherals to thank for — an assembly of state machines that even let you “bitbang” high-speed interfaces like DVI. If you’re interested in how PIO functions, there are some good write-ups around here. Lacking a Pi Pico, you can use this board’s bigger sister to interface with JTAG, too.