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We’re accustomed to seeing giant LED-powered screens in sports venues and outdoor displays. What would it take to bring this same technology into your living room? Very, very tiny LEDs. MicroLEDs.
MicroLED screens have been rumored to be around the corner for almost a decade now, which means that the time is almost right for them to actually become a reality. And certainly display technology has come a long way from the early cathode-ray tube (CRT) technology that powered the television and the home computer revolution. In the late 1990s, liquid-crystal display (LCD) technology became a feasible replacement for CRTs, offering a thin, distortion-free image with pixel-perfect image reproduction. LCDs also allowed for displays to be put in many new places, in addition to finally having that wall-mounted television.
Since that time, LCD’s flaws have become a sticking point compared to CRTs. The nice features of CRTs such as very fast response time, deep blacks and zero color shift, no matter the angle, have led to a wide variety of LCD technologies to recapture some of those features. Plasma displays seemed promising for big screens for a while, but organic light-emitting diodes (OLEDs) have taken over and still-in-development technologies like SED and FED off the table.
While OLED is very good in terms of image quality, its flaws including burn-in and uneven wear of the different organic dyes responsible for the colors. MicroLEDs hope to capitalize on OLED’s weaknesses by bringing brighter screens with no burn-in using inorganic LED technology, just very, very small.
Bad news, Martian helicopter fans: Ingenuity, the autonomous helicopter that Perseverance birthed onto the Martian surface a few days ago, will not be taking the first powered, controlled flight on another planet today as planned. We’re working on a full story so we’ll leave the gory details for that, but the short version is that while the helicopter was undergoing a full-speed rotor test, a watchdog timer monitoring the transition between pre-flight and flight modes in the controller tripped. The Ingenuity operations team is going over the full telemetry and will reschedule the rotor test; as a result, the first flight will occur no earlier than Wednesday, April 14. We’ll be sure to keep you posted.
Anyone who has ever been near a refinery or even a sewage treatment plant will have no doubt spotted flares of waste gas being burned off. It can be pretty spectacular, like an Olympic torch, but it also always struck us as spectacularly wasteful. Aside from the emissions, it always seemed like you could at least try to harness some of the energy in the waste gasses. But apparently the numbers just never work out in favor of tapping this source of energy, or at least that was the case until the proper buzzword concentration in the effluent was reached. With the soaring value of Bitcoin, and the fact that the network now consumes something like 80-TWh a year, building portable mining rigs into shipping containers that can be plugged into gas flaring stacks at refineries is now being looked at seriously. While we like the idea of not wasting a resource, we have our doubts about this; if it’s not profitable to tap into the waste gas stream to produce electricity now, what does tapping it to directly mine Bitcoin really add to the equation?
What would you do if you discovered that your new clothes dryer was responsible for a gigabyte or more of traffic on your internet connection every day? We suppose in this IoT world, such things are to be expected, but a gig a day seems overly chatty for a dryer. The user who reported this over on the r/smarthome subreddit blocked the dryer at the router, which was probably about the only realistic option short of taking a Dremel to the WiFi section of the dryer’s control board. The owner is in contact with manufacturer LG to see if this perhaps represents an error condition; we’d actually love to see a Wireshark dump of the data to see what the garrulous appliance is on about.
As often happens in our wanderings of the interwebz to find the very freshest of hacks for you, we fell down yet another rabbit hole that we thought we’d share. It’s not exactly a secret that there’s a large number of “Star Trek” fans in this community, and that for some of us, the way the various manifestations of the series brought the science and technology of space travel to life kick-started our hardware hacking lives. So when we found this article about a company building replica Tricorders from the original series, we followed along with great interest. What we found fascinating was not so much the potential to buy an exact replica of the TOS Tricorder — although that’s pretty cool — but the deep dive into how they captured data from one of the few remaining screen-used props, as well as how the Tricorder came to be.
And finally, what do you do if you have 3,281 drones lying around? Obviously, you create a light show to advertise the launch of a luxury car brand in China. At least that’s what Genesis, the luxury brand of carmaker Hyundai, did last week. The display, which looks like it consisted mostly of the brand’s logo whizzing about over a cityscape, is pretty impressive, and apparently set the world record for such things, beating out the previous attempt of 3,051 UAVs. Of course, all the coverage we can find on these displays concentrates on the eye-candy and the blaring horns of the soundtrack and gives short shrift to the technical aspects, which would really be interesting to dive into. How are these drones networked? How do they deal with latency? Are they just creating a volumetric display with the drones and turning lights on and off, or are they actually moving drones around to animate the displays? If anyone knows how these things work, we’d love to learn more, and perhaps even do a feature article.
We understand that SpaceX runs some contract missions for US gov’t agencies that don’t appreciate leaking info about their satellite’s whereabouts, but for non-secret missions, we don’t see the harm in letting the amateurs listen in over their shoulder. Maybe they’re doing it for PR reasons if/when something goes badly wrong?
Whatever the reasons, it’s a shame. Space has been open to hackers for a long time, knowingly in the case of amateur satellites, and unknowingly in the case of many other satellites which until the mid-90s had command channels that were unencrypted. (I’ll have to stick with “unnamed sources” on this one, but I do know a person who has rotated a satellite that he or she didn’t own.) There’s a lot to be learned by listening to signals from above, and while you can still decode weather satellite data yourself, it’s not quite as sexy as downloading images straight from a Falcon 9.
The cool hand for SpaceX to have played would have been to say “of course — we broadcast unencrypted as PR to our biggest fans” but it looks instead like they simply didn’t think that anyone would be listening in, and this caught them by surprise and they panicked. In 2021, with something as complicated as a space mission, that’s a little bit embarrassing. Anyway, to those of you who managed to get in before encryption, kudos!
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Hackaday editors Mike Szczys and Elliot Williams recap a week of great hacks. You won’t want to miss the dynamometer Leo Fernekes built to measure the power output of his Sterling engine, which is also DIY. In this age of lithium-powered multirotors, it’s nice to step back and appreciate a hand-built rubberband-powered ornithopter.
We have a surprising amount to say about Python’s addition of the match statement (not be be confused with switch statements). And when it comes to electromechanical synth gear, it’s hard to beat a spinning tape-head sequencer.
Take a look at the links below if you want to follow along, and as always, tell us what you think about this episode in the comments!
Facebook had a problem, way back in the simpler times that was 2019. Something like 533 million accounts had the cell phone number associated with the account leaked. It’s making security news this week, because that database has now been released for free in its entirety. The dataset consists of Facebook ID, cell number, name, location, birthday, bio, and email address. Facebook has pointed out that the data was not a hack or breach, but was simply scraped prior to a vulnerability being fixed in 2019.
The vulnerability was in Facebook’s contact import service, also known as the “Find Friends” feature. The short explanation is that anyone could punch a random phone number in, and get a bit of information about the FB account that claimed that number. The problem was that some interfaces to that service didn’t have appropriate rate limiting features. Combine that with Facebook’s constant urging that everyone link a cell number to their account, and the default privacy setting that lets anyone locate you by your cell number, and the data scraping was all but inevitable. The actual technique used may have been to spoof that requests were coming from the official Facebook app.
Excited about your new electric vehicle? Thomas Edison would be, too. He tried to produce electric vehicles for Ford around 1900. Petroleum-based vehicles dashed his dreams of the electric car, and the battery he wanted to use languished as a technological dead end. The batteries were long-lasting, sure, but they were expensive and had other problems, not the least of which was producing hydrogen gas. But that battery technology is receiving renewed interest today, because some of the things that made it a bad car battery make it good for alternate energy projects.
One of the joys of an itinerant existence comes in periodically being reunited with the fruits of various orders that were sent to hackerspaces or friends somewhere along the way. These anonymous parcels from afar hold an assortment of wonders, with the added element of anticipation that comes from forgetting exactly what had been ordered.
So it is with today’s subject, a Mustool MT525 electromagnetic radiation tester. At a cost not far above £10 ($13.70), this was an impulse purchase driven by curiosity; these devices claim to measure both magnetic and electric fields, but what do they really measure? My interest in these matters lies in the direction of radio, but I have never examined such an instrument. Time to subject it to the Hackaday treatment.
