While it is sort of disturbing, it is one of the best uses for a round LCD we’ve seen lately. What is it? Just [vishalsoniindia]’s SoulCage — a pendant that appears to have a poor soul trapped inside of it. Just in time for the upcoming spooky holiday. You can see the device in operation in the short video below.
The heart (sorry, unintentional pun) of the device is an ESP32-S3 round display. That means the rest of it is software, a battery, and a 3D printed case. There’s a switch, too, to select a male or female image as well as shut the device off when not in use.
When you think of “secret” agencies, you probably think of the CIA, the NSA, the KGB, or MI-5. But the real secret agencies are the ones you hardly ever hear of. One of those is the National Reconnaissance Office (NRO). Formed in 1960, the agency was totally secret until the early 1970s.
If you have heard of the NRO, you probably know they manage spy satellites and other resources that get shared among intelligence agencies. But did you know they played a major, but secret, part in the Apollo 11 recovery? Don’t forget, it was 1969, and the general public didn’t know anything about the shadowy agency.
In the 1960s, civilian weather forecasting was not as good as it is now. But Brandli had access to data from the NRO’s Defense Meteorological Satellite Program (DMSP), then known simply as “417”. The high-tech data let him estimate the weather accurately over the drop zones for five days, much better than any contemporary civilian meteorologist could do.
When Apollo 11 headed home, Captain Brandli ran the numbers and found there would be a major tropical storm over the drop zone, located at 10.6° north by 172.5° west, about halfway between Howland Island and Johnston Atoll, on July 24th. The storm was likely to be a “screaming eagle” storm rising to 50,000 feet over the ocean.
In the movies, of course, spaceships are tough and can land in bad weather. In real life, the high winds could rip the parachutes from the capsule, and the impact would probably have killed the crew.
Oh, Radio Shack. What a beautiful place you once were, a commercial haven for those seeking RC cars, resistors, and universal remotes. Then, the downfall, as you veered away from your origins, only to lead to an ultimate collapse. More recently, the brand was supposed to return to new heights online… only to fall afoul of the Securities and Exchange Commission. (via Yahoo Finance, Bloomberg)
The Radio Shack brand was picked up a few years ago by a company known as Retail Ecommerce Ventures (REV). The company’s modus operandi was to take well-known but beleaguered brands and relaunch them as online-only operations. Beyond Radio Shack, REV also owned a number of other notable brand names, like Pier 1, Modell’s Sporting Goods, and Dress Barn.
Unfortunately, the Radio Shack rebirth probably won’t reach the stellar heights of the past. Namely, because REV has been accused of operating a Ponzi-like scheme by the SEC. Despite huge boasts allegedly made to investors, none of REV’s portfolio of brands were actually making profits, and the SEC has charged that the company was paying investor returns with cash raised from other investors — unsustainable, and a major no-no, legally speaking. In any case, the SEC charges apply directly to REV. The RadioShack brand has since been acquired by Unicomer Group, which operates the current online business, and has no ties to REV or its former operators.
We were cautiously optimistic when we heard about the REV buyout back in 2020, but at this point, it’s probably best to come to terms with the fact that Radio Shack won’t be returning to its former glory. The name will linger in our hearts for some time to come, but the business we knew is long gone. Sometimes it’s better to look to the future than to try and recreate the magic of the past, especially if you’re doing inappropriate things with other people’s money in the process.
For RC aircraft there are generally legal restrictions that require the craft to stay within line of sight of the operator, but an RC boat or car can in theory go as far as the signal will allow — provided there is ample telemetry to let the operator navigate. [Thingify] took this idea to the extreme with a remote-controlled boat that connects to a satellite internet service and adds solar panels for theoretically unlimited range, in more ways than one.
The platform for this boat is a small catamaran, originally outfitted with an electric powertrain running on a battery. Using a satellite internet connection not only allows [Thingify] to receive telemetry and pilot the craft with effectively unlimited range, but it’s a good enough signal to receive live video from one of a pair of cameras as well. At that point, the main limiting factor of the boat was the battery, so he added a pair of flexible panels on a custom aluminum frame paired with a maximum power point tracking charge controller to make sure the battery is topped off. He also configured it to use as much power as the panels bring in, keeping the battery fully charged and ready for nightfall where the boat will only maintain its position and wait for the sun to rise the next morning.
With this setup [Thingify] hopes to eventually circumnavigate Lake Alexandrina in Australia. Although he has a few boat design issues to work out first; on its maiden voyage the boat capsized due to its high center of gravity and sail-like solar panels. Still, it’s an improvement from the earlier version of the craft we saw at the beginning of the year, and we look forward to his next iteration and the successful voyage around this lake.
If you were to troll your colleagues, you can label your office coffee maker any day with a sticker that says ‘voice activated’. Now [edholmes2232] made it actually come true. With Speech2Touch, he grafts voice control onto a Franke A600 coffee machine using an STM32WB55 USB dongle and some clever firmware hacking.
The office coffee machine has been a suspect for hacking for years and years. Nearly 35 years ago, at Cambridge University, a webcam served a live view of the office coffee pot. It made sure nobody made the trip to the coffee pot for nothing. The funny, but in fact useless HTTP status 418 was brought to life to state that the addressed server using the protocol was in fact a teapot, in answer to its refusal to brew coffee. Enter this hack – that could help you to coffee by shouting from your desk – if only your arms were long enough to hold your coffee cup in place.
Back to the details. The machine itself doesn’t support USB keyboards, but does accept a USB mouse, most likely as a last resort in case the touchscreen becomes irresponsive. That loophole is enough: by emulating touchscreen HID packets instead of mouse movement, the hack avoids clunky cursors and delivers a slick ‘sci-fi’ experience. The STM32 listens through an INMP441 MEMS mic, hands speech recognition to Picovoice, and then translates voice commands straight into touch inputs. Next, simply speaking to it taps the buttons for you.
It’s a neat example of sidestepping SDK lock-in. No reverse-engineering of the machine’s firmware, no shady soldering inside. Instead, it’s USB-level mischief, modular enough that the same trick could power voice control on other touchscreen-only appliances.
The big problem with Low Earth Orbit is, oddly enough, air resistance. Sure, there’s not enough air to breathe in space, but there is enough to create drag when you’re whipping around the planet at 28,000 km/h (17,000 mph) or more. Over time, that adds up to a decaying orbit. [Eager Space] recently did a video summarizing a paradoxical solution: go even lower, and let the air work for you.
So called air-breathing satellites would hang out in very low earth orbit– still well above the Karman line, but below 300 km (186 miles)– where atmospheric drag is too dominant for the current “coast on momentum” satellite paradigm to work. There are advantages to going so low, chiefly for communications (less latency) and earth observation (higher resolutions). You just need to find a way to fight that drag and not crash within a couple of orbits.
It turns out this space isn’t totally empty (aside from the monoatomic oxygen) as missions have been at very low orbits using conventional, Xenon-fueled ion engines to counter drag. The xenon runs out pretty quick in this application, though, and those satellites all had fairly short lifetimes.
That’s where the air-breathing satellites come in. You don’t need a lot of thrust to stabilize against drag, after all, and the thin whisps of air at 200 km or 300 km above ground level should provide ample reaction mass for some kind of solar-electric ion engine. The devil is in the details, of course, and [Eager Space] spends 13 minutes discussing challenges (like corrosive monoatomic oxygen) and various proposals.
Whoever is developing these satellites, they could do worse than talk to [Jay Bowles], whose air-breathing ion thrusters have been featured here several times over the years.
While we often get a detailed backstory of the projects we cover here at Hackaday, sometimes the genesis of a build is a bit of a mystery. Take [maurycyz]’s radiation survey meter modifications, for instance; we’re not sure why such a thing is needed, but we’re pretty glad we stumbled across it.
To be fair, [maurycyz] does give us a hint of what’s going on here by choosing the classic Ludlum Model 3 to modify. Built like a battleship, these meters would be great for field prospecting except that the standard G-M tube isn’t sensitive to gamma rays, the only kind of radiation likely not to be attenuated by soil. A better choice is a scintillation tube, but those greatly increase the background readings, making it hard to tease a signal from the noise.
To get around this problem and make rockhounding a little more enjoyable, [maurycyz] added a little digital magic to the mostly analog Ludlum. An AVR128 microcontroller taps into the stream of events the meter measures via the scintillation tube, and a little code subtracts the background radiation from the current count rate, translating the difference into an audible tone. This keeps [maurycyz]’s eyes on the rocks rather than on the meter needle, and makes it easier to find weakly radioactive or deeply buried specimens.
If you’re not ready to make the leap to a commercial survey meter, or if you just want to roll your own, we’ve got plenty of examples to choose from, from minimalist to cyberpunkish.
