GuerillaClock Could Save This City Thousands

They say necessity is the mother of invention. But if the thing you need has already been invented but is extremely expensive, another mother of invention might be budget overruns. That was the case when [klinstifen]’s local government decided to put in countdown clocks at bus stops, at a whopping $25,000 per clock. Thinking that was a little extreme, he decided to build his own with a much smaller price tag.

The project uses a Raspberry Pi Zero W as its core, and a 16×32 RGB LED matrix for a display. Some of the work is done already, since the bus system has an API that is readily available for use. The Pi receives the information about bus schedules through this API and, based on its location, is able to determine the next bus arrival time and display it on the LED matrix. With the custom 3D printed enclosure and all of the other material, the cost of each clock is only $100, more than two orders of magnitude less expensive.

Hopefully the local government takes a hint from [klinstifen] and decides to use a more sane solution. In the meantime, you might be able to build your own mass transit clock that you can use inside your own house, rather than at the train station, if you’re someone who has a hard time getting to the bus stop on time.

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Play Chess Against A Ghost

While chess had long been a domain where humans were superior to computers, the balance has shifted quite substantially in the computers’ favor. But the one thing that humans still have control over is the pieces themselves. That is, until now. A group has built a robot that both uses a challenging chess engine, and can move its own pieces.

The robot, from creators [Tim], [Alex S], and [Alex A], is able to manipulate pieces on a game board using a robotic arm under the table with an electromagnet. It is controlled with a Raspberry Pi, which also runs an instance of the Stockfish chess engine to play the game of chess itself. One of the obvious hurdles was how to keep the robot from crashing pieces into one another, which was solved by using small pieces on a large board, and always moving the pieces on the edges of the squares.

This is a pretty interesting project, especially considering it was built using a shoestring budget. And, if you aren’t familiar with Stockfish, it is one of the most powerful chess engines and also happens to be free and open-source. We’ve seen it used in some other chess boards before, although those couldn’t move their own pieces.

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Build Your Own Supercomputer with ESP32s

If the computer you have isn’t particularly fast, there’s a well-documented way to get more out of it. You just need more of the same computer, and you can run your tasks on them all at the same time. Building computer clusters is an effective way of decreasing the time it takes for computers to solve certain problems, even if the computers themselves aren’t top-of-the-line hardware. Of course, with cheap enough hardware, people will build clusters out of just about anything, including the ESP32.

For this project, [Wei Lin] admits that this isn’t really a serious attempt at building speedy hardware, but rather an interesting exercise in creating a cluster as a sort of learning experience. ESP32 boards can be found for around $10 so building an experimental cluster with these is even more feasible than using the Raspberry Pi. [Wei Lin] goes into a great amount of detail on his GitHub page about all of his goals with the project, most of which involve exploring the functionality of the new cluster and its underpinnings.

While this might seem like little more than a thought experiment, it does have the advantage of being a great solution for problems that involve gathering data from points that are physically very far from one another. If you’ve ever been interested in parallel computing or computing clusters, this is a great project to check out. If you have more Raspberry Pis on hand than ESP32s and still want to build a cluster, check out this project that used a mere 750 of them for one.


The Ultimate iPhone Upgrade

While Apple products have their upsides, the major downside with them is their closed environment. Most of the products are difficult to upgrade, to say the least, and this is especially true with the iPhone. While some Android devices still have removable storage and replaceable batteries, this has never been an option for any of Apple’s phones. But that doesn’t mean that upgrading the memory inside the phone is completely impossible.

[Scotty] from [Strange Parts] is no stranger to the iPhone, and had heard that there are some shops that can remove the storage chip in the iPhone and replace it with a larger one so he set out on a journey to try this himself. The first step was to program the new chip, since they must have software on them before they’re put in the phone. The chip programmer ironically doesn’t have support for Mac, so [Scotty] had to go to the store to buy a Windows computer first before he could get the chip programmer working right.

After that hurdle, [Scotty] found a bunch of old logic boards from iPhones to perfect his desoldering and resoldering skills. Since this isn’t through-hole technology a lot of practice was needed to desolder the chip from the logic board without damaging any of the other components, then re-ball the solder on the logic board, and then re-soldering the new larger storage chip to the logic board. After some hiccups and a lot of time practicing, [Scotty] finally had an iPhone that he upgraded from 16 GB to 128 GB.

[Scotty] knows his way around the iPhone and has some other videos about other modifications he’s made to his personal phone. His videos are very informative, in-depth, and professionally done so they’re worth a watch even if you don’t plan on trying this upgrade yourself. Not all upgrades to Apple products are difficult and expensive, though. There is one that costs only a dollar.

We sat down with him after his talk at the Hackaday Superconference last November, and we have to say that he made us think more than twice about tackling the tiny computer that lies hidden inside a cell phone. Check out his talk if you haven’t yet.

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Floor Mopping Robot Takes Cleanliness to the Next Level

While it’s nice to have a robot vacuum your floors for you, a vacuum can only clean your house so much. For a really deep clean, you’ll also need to run a mop over the hard floor surfaces. [Josh] took this to its logical conclusion and built a robot that can really scour his floors for his entry into this year’s Hackaday Prize.

The robot has the ability to spray the floor with a cleaning solution, and then drive over it and scrub the floors with a squeegee. Its designed in a way that allows it to get into tight corners without needing a special brush, and of course it has all the bells and whistles that other robots have, such as ultrasonic sensors, collision detection, and a brain that allows it to navigate a course and get the entire area cleaned.

There are many videos of the robot in action on the project site, showing its operation and testing various features of the device. It’s a pretty interesting take on the home robot, and since its Open Hardware you can build your own if you’re often frustrated by having to mop your own floors, or you could modify it to do things other than squeegee the floors clean.

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Can You 3D Print an Axe?

3D printers hit the scene in a big way in the last decade, and thanks to the constant improvements that we’ve seen since then you can now get a decent one, assembled or as a kit, for a reasonable price. The one major drawback is that almost all of these printers are limited to printing in plastic, which has its obvious limitations. Printing in metal seems like the next logical step, and a group from Michigan Tech has created something that is accessible to most of us. Spoiler: they used plastic and metal printing to print a functioning axe.

Untill now, most metal printers have used a process like laser sintering to achieve the desired effect. This group uses a much more common tool: a MIG welder. MIG welders work by passing a wire through the welding handle, which would normally used as the filler material for the weld. If you use the wire for laying down material rather than for welding specifically, you can build up material on a surface in essentially the same way that a printer that prints plastic would.

From there, all that’s needed is to attach the MIG welder to a CNC machine and get to printing. The team has produced some great results so far, including some metal braces and farm implements, so hopefully their work leads to another revolution in 3D printing for the masses. We think it’s high time.

Chiptunes on a Solar Panel

With its vintage sound, there’s no mistaking the unique 8-bit sound of video games from the 80s and 90s. It became so popular that eventually sparked its own genre of music known as “chiptune” for which musicians are still composing today. The music has some other qualities though, namely that it’s relatively simple from a digital standpoint. [Robots Everywhere] found that this simplicity made it perfect as a carrier for wireless power transmission.

The project acts more like a radio transmitter and receiver than it does a true wireless power transmitter, but the principle is the same. It uses a modified speaker driver and amplifier connected to a light source, rather than to a speaker. On the receiving end, there is a solar panel (essentially a large photodetector) which is wired directly to a pair of earbuds. When the chiptune is played through the amplifier, it is sent via light to the solar panel where it can be listened to in the earbuds.

The project is limited to 24,000 bytes per second which is a whole lot more useful than just beaming random audio files around your neighborhood, although that will still work. You can also use something like this to establish a long-distance serial link wirelessly, which can be the basis of a long distance communications network.

Thanks to [spiritplumber] for the tip!

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