Self-Glowing Ring Is Its Own Battery

April 4, 2020 by Lewin Day 19 Comments

LED jewelry has always been a popular part of the maker community. Oftentimes, coin cells are used as a compact source of power, or wires are run to discreet hidden battery packs. [OguzC3] went another route, however, creating a glowing ring which works as its own battery.

The design will be familiar to those who have done high-school experiments on basic batteries. An aluminium pipe forms the inner surface of the ring, which is then wrapped in a layer of newspaper. A copper outer ring is then placed outside. When soaked in a salt water solution, this forms a basic battery. The voltage output is only around 0.5 volts, so a joule thief circuit is built into the ring to step this up high enough to drive an LED. [OguzC3] reports that the ring lasts several hours at a time, and only needs a quick rinse in fresh salty water to recharge.

It’s a creative concept, and the final piece looks like a magical object from the world of fantasy. It would make a great addition to any cosplay, and we’re sure the technique could be adapted to other accoutrements, too. A similar experiment done in a more extreme way is this electric car charged via lemons. If you’ve got your own battery chemistry project cooking up at home, be sure to let us know!

Can Solid Save The Internet?

April 4, 2020 by Elliot Williams 32 Comments

We ran an article on Solid this week, a project that aims to do nothing less than change the privacy and security aspects of the Internet as we use it today. Sir Tim Berners-Lee, the guy who invented the World Wide Web as a side project at work, is behind it, and it’s got a lot to recommend it. I certainly hope they succeed.

The basic idea is that instead of handing your photos, your content, and your thoughts over to social media and other sharing platforms, you’d store your own personal data in a Personal Online Data (POD) container, and grant revocable access to these companies to access your data on your behalf. It’s like it’s your own website contents, but with an API for sharing parts of it elsewhere.

This is a clever legal hack, because today you give over rights to your data so that Facebook and Co. can display them in your name. This gives them all the bargaining power, and locks you into their service. If instead, you simply gave Facebook a revocable access token, the power dynamic shifts. Today you can migrate your data and delete your Facebook account, but that’s a major hassle that few undertake.

Mike and I were discussing this on this week’s podcast, and we were thinking about the privacy aspects of PODs. In particular, whatever firm you use to socially share your stuff will still be able to snoop you out, map your behavior, and target you with ads and other content, because they see it while it’s in transit. But I failed to put two and two together.

The real power of a common API for sharing your content/data is that it will make it that much easier to switch from one sharing platform to another. This means that you could easily migrate to a system that respects your privacy. If we’re lucky, we’ll see competition in this space. At the same time, storing and hosting the data would be portable as well, hopefully promoting the best practices in the providers. Real competition in where your data lives and how it’s served may well save the Internet. (Or at least we can dream.)

Open Source Telescope Controller Puts Smart Features In Old Telescopes

April 4, 2020 by Richard Baguley 10 Comments

In times like these, we all need to look beyond ourselves. This project might help: OnStep is an open-source telescope controller, a device that controls a telescope to point at something interesting in the sky. Want to take a look at M31? Use an app on a PC or smartphone, select the object and the OnStep will pan and tilt your telescope until the Andromeda Galaxy pops into view.

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Is This The Oldest Still-Working Geostationary Satellite?

April 4, 2020 by Jenny List 39 Comments

Regular followers of space news will know that when satellites or space probes reach the end of their life, they either are de-orbited in a fiery re-entry, or they stay lifeless in orbit, often in a safe graveyard orbit where they are unlikely to harm other craft. Sometimes these deactivated satellites spring back into life, and there is a dedicated band of enthusiasts who seek out these oddities. Dead satellite finder extraordinaire [Scott Tilley] has turned up a particularly unusual one, a craft that is quite likely to be the oldest still-working geostationary satellite.

LES-5 is an experimental satellite built by MIT’s Lincoln Labs, launched in 1967, and used to test military UHF communications in a geosynchronous orbit. It had an active life into the early 1970s after which it was placed in a graveyard orbital slot for redundant craft. It’s lain forgotten ever since, until this month when [Scott] found its beacon transmitting on 236.75 MHz. The Twitter thread is an extremely interesting glimpse into the satellite finder’s art, as first he’s not certain at all that it is LES-5 so he waits for its solar eclipse to identify its exact position.

Whether anything on the craft can find another use today is not certain, as he finds no evidence of its transponder. Still, that something is working again 53 years after its launch is a testament to the quality of its construction. Should its transponder be reactivated again it’s not impossible that people might find illicit uses for it, after all that’s not the first time this has happened.

Oscilloscope And Microscope Augmented With Ghosts

April 3, 2020 by Bryan Cockfield 13 Comments

Augmented reality saw a huge boom a few years ago, where an image of the real world has some virtual element layer displayed on top of it. To get this effect to work, however, you don’t need a suite of software and smart devices. [elad] was able to augment a microscope with the output from an oscilloscope, allowing him to see waveforms while working on small printed circuit boards with the microscope.

The build relies on a simplified version of the Pepper’s Ghost illusion. This works by separating two images with a semi-transparent material such as glass, placed at an angle. When looking through the material, the two images appear to blend together. [elad] was able to build a box that attaches to the microscope with a projection of the oscilloscope image augmented on the view of the microscope.

This looks like it would be incredibly useful for PCBs, especially when dealing with small SMD components. The project is split across two entries, the second of which is here. In one demonstration the oscilloscope image is replaced with a visual of a computer monitor, so it could be used for a lot more applications than just the oscilloscope, too. There aren’t a lot of details on the project page though, but with an understanding of Pepper’s Ghost this should be easily repeatable. If you need more examples, there are plenty of other builds that use this technique.

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Making Aerogel, It’s Not For The Faint-Hearted

April 3, 2020 by Al Williams 12 Comments

Aerogel — that mixture of air and silica — is one of those materials that seems like a miracle. It is almost not there since the material is 99% air. [NileRed] wanted to make his own and he documented his work in a recent video you can see below.

If you decide to replicate his result, be careful with the tetramethyl orthosilicate. Here’s what he says about it:

And the best part is, that when it’s in your eyes, it gets under the surface, and the particles are way too small to remove. For this reason, you could go permanently blind.

It can also mess up your lungs, so you probably need a vent hood to really work with this. It isn’t cheap, either. The other things you need are easier to handle: methanol, distilled water, and ammonia.

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A Touchless Handwashing Timer Comes In Handy

April 3, 2020 by Lewin Day 23 Comments

In 2020, it’s no longer enough to simply wash your hands. You’ve got to do it right. Proper process involves rubbing soap and water over every surface of your hands, and taking a full 20 seconds to do the job. While many recommend singing various popular songs to keep time, that can be more than a little embarassing in shared spaces. [Alex Glow] instead created this simple timer to help out.

The timer is built on the Adafruit Circuit Playground Express, a devboard that features 10 RGB LEDs already onboard, making the project a cinch. It also comes with a MEMS microphone and a light sensor all ready to go. Thus, with a bit of code, [Alex] was able to create a timer activated by a loud noise, such as clapping. Once detected, the timer starts, flashing its LEDs to indicate time remaining. There’s also a nightlight feature, which activates when light levels decrease, making it easier to navigate the bathroom in the dark.

It’s a useful little project for these troubled times, and one that makes great use of everything onboard the Circuit Playground Express. Having everything included certainly does make projects come together quickly. You can even program it from your phone! Video after the break.

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