Remoticon 2021 // Rob Weinstein Builds An HP-35 From The Patent Up

Fifty years ago, Hewlett-Packard introduced the first handheld scientific calculator, the HP-35. It was quite the engineering feat, since equivalent machines of the day were bulky desktop affairs, if not rack-mounted. [Rob Weinstein] has long been a fan of HP calculators, and used an HP-41C for many years until it wore out. Since then he gradually developed a curiosity about these old calculators and what made them tick. The more he read, the more engrossed he became. [Rob] eventually decided to embark on a three year long reverse-engineer journey that culminated a recreation of the original design on a protoboard that operates exactly like the original from 1972 (although not quite pocket-sized). In this presentation he walks us through the history of the calculator design and his efforts in understanding and eventually replicating it using modern FPGAs.

The HP patent ( US Patent 4,001,569 ) contains an extremely detailed explanation of the calculator in nearly every aspect. There are many novel concepts in the design, and [Rob] delves into two of them in his presentation. Early LED devices were a drain on batteries, and HP engineers came up with a clever solution. In a complex orchestra of multiplexed switches, they steered current through inductors and LED segments, storing energy temporarily and eliminating the need for inefficient dropping resistors. But even more complicated is the serial processor architecture of the calculator. The first microprocessors were not available when HP started this design, so the entire processor was done at the gate level. Everything operates on 56-bit registers which are constantly circulating around in circular shift registers. [Rob] has really done his homework here, carefully studying each section of the design in great depth, drawing upon old documents and books when available, and making his own material when not. For example, in the course of figuring everything out, [Rob] prepared 338 pages of timing charts in addition to those in the patent. Continue reading “Remoticon 2021 // Rob Weinstein Builds An HP-35 From The Patent Up”

REMOTICON 2021 // Hal Rodriguez And Sahrye Cohen Combine Couture And Circuitry

[Hal Rodriguez] and [Sahrye Cohen] of Amped Atelier focus on creating interactive wearable garments with some fairly high standards. Every garment must be pretty, and has to either be controllable by the wearer, through a set of sensors, or even by the audience via Bluetooth. Among their past creations are a dress with color sensors and 3D-printed scales on the front that change color, and a flowing pantsuit designed for a dancer using an accelerometer to make light patterns based on her movements.

Conductive Melody — a wearable musical instrument that is the focus of [Sahrye] and [Hal]’s Remoticon 2021 talk — was created for a presentation at Beakerhead Festival, a multi-day STEAM-based gathering in Calgary. [Sahrye] and [Hal] truly joined forces for this one, because [Sahrye] is all about electronics and costuming, and [Hal] is into synths and electronic music. You can see the demo in the video after the break.

The dress’s form is inspired by classical instruments and the types of clothing that they in turn inspired, such as long, generous sleeves for harp players and pianists. So [Hal] and [Sahrye] dreamed up a dress with a single large playable sleeve that hangs down from the mid- and upper arm. The sleeve is covered with laser-cut conductive fabric curlicues that look like a baroque interpretation of harp strings. Play a note by touching one of these traces, and the lights on the front of the dress will move in sync with the music.

[Sahrye] started the dress portion of Conductive Melody with a sketch of the garment’s broad strokes, then painted a more final drawing with lots of detail. Then she made a muslin, which is kind of the breadboard version of a project in garment-making where thin cotton fabric is used to help visualize the end result. Once satisfied with the fit, [Sahrye] then made the final dress out of good fabric. And we mean really good fabric — silk, in this case. Because as [Sahrye] says, if you’re going to make a one-off, why not make as nicely as possible? We can totally get behind that.

[Sahrye] says she is always thinking about how a wearable will be worn, and how it will be washed or otherwise cared for. That sequined and semi-sheer section of the bodice hides the LEDs and their wiring quite well, while still being comfortable for the wearer.

Inside the sleeve is an MPRP121 capacitive touch sensor and an Arduino that controls the LEDs and sends the signals to a Raspberry Pi hidden among the ruffles in the back of the dress.

The Pi is running Piano Genie, which can turn eight inputs into an 88-key piano in real time. When no one is playing the sleeve, the lights have a standby mode of mellow yellows and whites that fade in and out slowly compared to the more upbeat rainbow of musical mode.

We love to see wearable projects — especially such fancy creations! — but we know how finicky they can be. Among the lessons learned by [Sahrye] and [Hal]: don’t make your conductive fabric traces too thin, and silver conductive materials may tarnish irreparably. We just hope they didn’t have to waste too much conductive fabric or that nice blue silk to find this out.

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Hacker Camps Are Back. To Get You In The Mood, Here’s A Story From 1997

The past couple of years of the COVID pandemic have been rough in some unexpected ways, and it’s clear that our world will never be quite the same as it was beforehand. In our community, the hackerspaces are open again, and while the pandemic hasn’t gone away this year shows the promise of hosting the first major hacker camps to be held since 2019. We’re sure a number of you will be making your way to them. To give a taste of what is to come we’ve got a rare glimpse into hacker camps past.

The Netherlands events are held every four years outside pandemic disruptions, and we’re going back as far as 1997 for HIP, or Hacking In Progress, where [Christine Karman] kept a daily diary of the event. 25 years later it’s both a familiar account of a hacker camp and an interesting glimpse into a time when for much of the wider population an Internet connection was still a novelty. Continue reading “Hacker Camps Are Back. To Get You In The Mood, Here’s A Story From 1997”

REMOTICON 2021 // Jay Doscher Proves Tinkercad Isn’t Just For Kids

We invited [Jay Doscher] to give us a view into his process designing 3D printed parts for the impressive array of cyberdecks we’ve covered since 2019.

[Jay] got his start as a maker through woodworking in high school, getting satisfaction from bringing something from idea to reality. After a more recent class in blacksmithing and ax-making showed him what he could do when really focused, his hardware hacking really took off and his line of cyberdecks and other portable computers was born.

If you’ve heard of Tinkercad, you probably think it’s just for kids. While designed as an educational tool, [Jay] found that Autodesk’s younger sibling to the professionally powered (and priced) Fusion 360 had everything needed for making cyberdecks. If you’re willing to work around a few limitations, at the low-low price of free, Tinkercad might be right for you too.

What limitations? To start, Tinkercad is only available in a browser and online. There’s also no guarantee that it will remain free, but [Jay] notes that with its educational focus that is likely to remain the case. There is no library of common components to import while modeling. And, when your model is complete the options for exporting are limited to 2D SVGs and 3D STL, OBJ, and gaming-focused GBL formats. [Jay] has converted those to other formats for laser cutting and the STEP file a machine shop is expecting but admits that it’s something that adds complexity and is an annoyance.

back7-TinkerCad-Alignment

In the talk, [Jay] discusses moving from his initial “cringy” explorations with Tinkercad, to his first cyberdeck, a little history on that term, and the evolution of his craft. It’s mostly a hands-on demo of how to work with Tinkercad, full of tips and tricks for the software itself and implications for 3D printing yourself, assembly, and machining by others.

While quite limited, Tinkercad still allows for boolean operations to join two volumes or the subtraction of one from another. [Jay] does a wonderful job of unpeeling the layers of operations, showing how combinations of “solids” and “holes” generated a complex assembly with pockets, stepped holes for fasteners, and multiple aligned parts for his next cyberdeck. Even if you already have a favorite CAD tool, another approach could expand your mind just like writing software in Strange Programming Languages can.

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Remoticon 2021 // Arsenijs Tears Apart Your Laptop

Hackaday’s own [Arsenijs Picugins] has been rather busy hacking old laptops apart and learning what can and cannot be easily reused, and presents for the 2021 Hackaday Remoticon, a heavily meme-loaded presentation with some very practical advice.

Full HD, IPS LCD display with touch support, reused with the help of a dedicated driver board

What parts inside a dead laptop are worth keeping? Aside from removable items like RAM stick and hard drives, the most obvious first target is the LCD panel. These are surprisingly easy to use, with driver boards available on the usual marketplaces, so long as you make sure to check the exact model number of your panel is supported.

Many components inside laptops are actually USB devices, things like touch screen controllers, webcams and the like are usually separate modules, which simply take power and USB. This makes sense, since laptops already have a fair amount of external USB connectivity, why not use it internally too? Other items are a bit trickier: trackpads seem to be either PS/2 or I2C and need a bit more hardware support. Digital microphones mostly talk I2S, which means some microcontroller coding.

Some items need a little more care, however, so maybe avoid older Dell batteries, with their ‘spicy pillow’ tendencies. As [Arsenijs] says, take them when they are ripe for the picking, but not too ripe. Batteries need a little care and feeding, make sure you’ve got some cell protection, if you pull raw cells! Charging electronics are always on the motherboard, so that’s something you’ll need to arrange yourself if you take a battery module, but it isn’t difficult, so long as you can find your way around SMBus protocol.

These batteries are too ripe. Leave them alone.

Older laptops were much more modular and some even designed for upgrade or modification, and this miniaturization-driven trend of shrinking everything — where a laptop now needs to be thin enough to shave with — is causing some manufacturers to move in a much more proprietary direction regarding hardware design.

This progression conflicts with our concerns of privacy, repairability and waste elimination, resulting in closed boxes filled with unrepairable, non-reusable black boxes. We think it’s time to take back some of the hardware, so three cheers to those taking upon themselves the task to reverse engineer and publish reusability information, and long may it be possible to continue.

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Remoticon 2021 // Vaibhav Chhabra And The M19 Collective Make One Million Faceshields

[Vaibhav Chhabra], the co-founder of Maker’s Asylum hackerspace in Mumbai, India, starts his Remoticon talk by telling a short story about how the hackerspace rose to its current status. Born out of frustration with a collapsed office ceiling, having gone through eight years of moving and reorganizations, it accumulated a loyal participant base – not unusual with hackerspaces that are managed well. This setting provided a perfect breeding ground for the M19 effort when COVID-19 reached India, mixing “what can we do” and “what should we do” inquiries into a perfect storm and starting the 49 day work session that swiftly outgrew the hackerspace, both physically and organizationally.

When the very first two weeks of the Infinite Two Week Quarantine Of 2020 were announced in India, a group of people decided to wait it out at the hackerspace instead of confining themselves to their homes. As various aspects of our society started crashing after the direct impact of COVID-19, news came through – that of a personal protective equipment shortage, especially important for frontline workers. Countries generally were not prepared when it came to PPE, and India was no different. Thus, folks in Maker’s Asylum stepped up, finding themselves in a perfect position to manufacture protective equipment when nobody else was prepared to help.

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Remoticon 2021 // Jay Bowles Dips Into The Plasmaverse

Every hacker out there is familiar with the zaps and sizzles of the Tesla coil, or the crash and thunder of lighting strikes on our hallowed Earth. These phenomena all involve the physics of plasma, a subject near and dear to Jay Bowles’s heart. Thus, he graced Remoticon 2021 with a enlightening talk taking us on a Dip Into the Plasmaverse.

Jay’s passion for the topic is obvious, having fallen in love with high voltage physics as a teenager. He appreciated how tangible the science was, whether it’s the glow of neon lighting or the heating magic of the common microwave. His talk covers the experiments and science that he’s studied over the past 17 years and in the course of running his Plasma Channel YouTube channel. Continue reading “Remoticon 2021 // Jay Bowles Dips Into The Plasmaverse”