Seems like [CNLohr] has some pretty cool friends, and he recently spent some time with a couple of them who are working with poly LMNs and finding out what they’re good for. Poly LMNs use a liquid metal composed of indium and gallium that can be sprayed onto a substrate through a laser-cut stencil. This results in traces that show the opposite of expected behavior; where most conductors increase in resistance when stretched, pol LMNs stay just as conductive no matter how much they’re stretched.
The video below shows [CNLohr]’s experiments with the stuff. He brought a couple of traditional PCB-based MCU circuits, which interface easily with the poly LMN traces on a thick tape substrate. Once activated by stretching, which forms the networks between the liquid metal globules, the traces act much like copper traces. Attaching SMD components is as simple as sticking them to the tape — no soldering required. The circuits remain impressively stretchy without any apparent effect on their electrical properties — a characteristic that should prove interesting for wearables circuits, biological sensors, and a host of real-world applications.
While poly LMNs aren’t exactly ready for the market yet, they don’t seem terribly difficult to make, requiring little in the way of exotic materials or specialized lab equipment. We’d love to see someone like [Ben Krasnow] pick this up and run with it — it seems right up his alley.
It is with a heavy heart that we must report the National Science Foundation (NSF) has decided to dismantle the Arecibo Observatory. Following the failure of two support cables, engineers have determined the structure is on the verge of collapse and that the necessary repairs would be too expensive and dangerous to conduct. At the same time, allowing the structure to collapse on its own would endanger nearby facilities and surely destroy the valuable research equipment suspended high above the 300 meter dish. Through controlled demolition, the NSF hopes to preserve as much of the facility and its hardware as possible.
In 1974, it was even used to broadcast the goodwill of humankind to any intelligent lifeforms that might be listening. Known as the “Arecibo Message”, the transmission can be decoded to reveal an assortment of pictograms that convey everything from the atomic numbers of common elements to the shape of the human body. The final icon in the series was a simple diagram of Arecibo itself, so that anyone who intercepted the message would have an idea of how such a relatively primitive species had managed to reach out and touch the stars.
There is no replacement for the Arecibo Observatory, nor is there likely to be one in the near future. The Five hundred meter Aperture Spherical Telescope (FAST) in China is larger than Arecibo, but doesn’t have the crucial transmission capability. The Goldstone Deep Space Communications Complex in California can transmit, but as it’s primarily concerned with communicating with distant spacecraft, there’s little free time to engage in scientific observations. Even when it’s available for research, the largest dish in the Goldstone array is only 1/4 the diameter of the reflector at Arecibo.
The good news is that as of today RadioShack has officially been purchased by Retail Ecommerce Ventures (REV), giving the troubled company a new lease on life. The downside, at least for folks like us, is that there are no immediate plans to return the iconic electronics retailer to its brick-and-mortar roots. As the name implies, REV specializes in online retail, having previously revamped the Internet presence of other bankrupt businesses such as Pier 1 Imports and Dressbarn.
While the press release doesn’t outright preclude the possibility of new physical RadioShack locations, it’s clear that REV believes the future of retail isn’t to be found in your local strip mall. As the US mulls further lockdowns in response to the continuing COVID-19 pandemic, it’s hard to disagree. There will be millions of bored kids and adults looking for something to do during the long winter nights, and an electronic kit or two shipped to their door might be just the thing.
REV says they plan to relaunch the rather dated RadioShack website just in time for the company’s 100th anniversary in 2021. As of this writing the website currently says that sales have been temporarily halted to allow for inventory restructuring, though it’s unclear if this is directly related to the buyout or not. Getting an accurate count of how much merchandise the company still has on hand after shuttering the majority of their physical locations in 2017 certainly sounds like something the new owners would want to do.
There’s a certain kind of joy that comes in throwing something together from spare parts, or from finding utility in a proof of concept for another project. [Clewsy] is cooking up something clacky and built this baby keeb to prove some stuff out, such as reading a key matrix. Now it’s become a music/media controller that looks great next to a giant matching volume knob.
Beneath the gently backlit Gateron blues is a custom ATMega32u4-based board, which is viewable through the clear acrylic bottom plate. That’s a nice touch. We’re not sure if the wood came from a picture frame, but if not, they seem like a great candidates for enclosure material.
This keeb looks fantastic, and we are partial to both the clear and the chrome keycaps. We can only hope [Clewsy] sends the details of the next build our way.
If you want to get started building keyboards, you can’t go wrong with a macro keyboard like this one. If you have way more than four macros in mind, build something bigger, like a custom game pad with a joystick.
If a temperature sensor takes a measurement in the woods but there’s nobody around to read it, is it hot out?
If you’ve got a project that’s collecting data, you might have reasons to put it online. Being able to read your data from anywhere has its perks, after all, and it’s key to building smarter interconnected systems, too. Plus, you can tell strangers the humidity in your living room while you’re out at the pub, and they’ll be really impressed.
Taking the leap into the Internet of Things can be daunting however, with plenty of competing services and options from the basic to the industrial-strength available. Today, we’re taking a look at two options for logging data online that are accessible to the beginner. Continue reading “Easy IoT Logging Options For The Beginner”→
If binary digits are bits, are quinary digits “quits”? Perhaps, but whatever you call them, you’re going to have to wrap your head around some new concepts in order to make sense of this quinary display clock.
Why quinary? [Spike Snell] wanted to minimize the number of LEDs, and 52 is enough to cover all 24 hours. Binary clocks may have geek chic, but there are only so many ways to display ones and zeros.
[Spike]’s clock is unique because it shows each quit using a single WS2812 Neopixel. The values zero through four are each represented by a different color, meaning the user needs to memorize which color goes with which value, which we suspect is the hardest part of learning this clock. The clock’s software is fairly simple and runs on an ESP8266, and uses NTP to keep on track. The clock self-adjusts for Daylight Savings time, and it has a nice feature that dims the display in the evening to make living with it easier.
Even for those not up on their base-five arithmetic, [Spike]’s clock is still a nice, slowly evolving abstract art piece. And for those who grok the quinary clock, perhaps a career awaits you in an alternate future where bi-quinary relay computers caught on.