Mechanical Seven-Segment Display Really Sticks Out From The Pack

We’ve been displaying numbers using segmented displays for almost 120 years now, an invention that predates the LEDs that usually power the ubiquitous devices by a half-dozen decades or so. But LEDs are far from the only way to run a seven-segment display — check out this mechanical seven-segment display for proof of that.

We’ve been seeing a lot of mechanical seven-segment displays lately, and when we first spotted [indoorgeek]’s build, we thought it would be a variation on the common “flip-dot” mechanism. But this one is different; to form each numeral, the necessary segments protrude from the face of the display slightly. Everything is 3D-printed from white filament, yielding a clean look when the retracted but casting a sharp shadow when extended. Each segment carries a small magnet on the back which snuggles up against the steel core of a custom-wound electromagnet, which repels the magnet when energized and extends the segment. We thought for sure it would be loud, but the video below shows that it’s really quiet.

While we like the subtle contrast of the display, it might not be enough for some users, especially where side-lighting is impractical. In that case, they might want to look at this earlier similar display and try contrasting colors on the sides of each segment.

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Watch Conway’s Game Of Life Flutter Across A Flip-Dot Display

Like many of us, [John Whittington] was saddened with the news that John Horton Conway passed away a little earlier this year, and in honor of his work, he added the Game of Life to a flip-dot display that he has been working on. The physicality of an electromechanical display seems particularly fitting for cellular automata.

Like what you see? If you’re curious about what makes it all tick, the display shown is an Alfa-Zeta XY5 28×14 but [John] is currently working on building them into a much larger 256 x 56 display. GitHub hosts the flip-dot simulator and driver software [John] is using, and the Game of Life functions are here.

If you’re new to the Game of Life and are not really sure what you’re looking at, [Elliot Williams] tells you all you need to know in his writeup celebrating its profound impact and lasting legacy. Watch the flip-dot display in action in the video embedded below.

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Mini Computer Brings Starfleet To Your Desk

It could be said that there are two types of people: those for whom the actor LeVar Burton is the host of Reading Rainbow, and those for whom he is Geordi LaForge, Chief Engineer of Star Trek TNG‘s Enterprise NCC1701-D. For those of us engineers who lie in the second camp, we can at least feel a little closer to the action thanks to a project from [Darian Johnson], a Star Trek TNG mini-computer which functions as a desktop information display.

Inside the 3D-printed case is an ESP32 version of the Adafruit Feather, talking to cloud services to pull in and aggregate the information on the TFT screen. It combines weather data, environmental sensor readings, his fitness tracker readings, and his schedule, with two useful applications. There’s a resistor colour code chart, and an LED series resistor calculator. He’s made a video showing it in operation which we’ve placed below the break, and in it, he’s captured the aesthetic of the LCARS interface perfectly. We can’t speak for a fictional future spacecraft officer, but we suspect that Geordi would be right at home with it.

We may not be able to bring you Geordi LaForge, but we can bring you a real Starfleet officer. She even shares something with LeVar Burton, in that she’s (much more) famous for something else.

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Stealing RAM For A Microcontroller From A TFT Display

PC users with long memories will recall the days when the one-megabyte barrier was  a significant problem, and the various tricks of extended and expanded memory used to mitigate it. One of them was to install a driver that mapped surplus graphics card memory as system memory when the display was in DOS text mode, and it was this that was brought to mind when we read about [Frank D]’s microcontroller implementation of Conway’s Game Of Life.

The components were those he had to hand; an STM32F030F4P6 and an RM68130 176 × 220 TFT board. The STM is not the most powerful of chips, with only 16 kB of Flash and 4 kB of RAM. The display has enough on-board memory to support 18 bits of colour information, but when it is running in eight-colour mode it only uses three of them. The 15 bits that remain are thus available to be used for other purposes, and though the arcane format in which they are read required some understanding they could be used to provide a very useful extra 38720 bytes of RAM for the microcontroller just as once happened with those DOS PC graphics cards of old. Interestingly, the same technique should work with other similar displays.

Though this isn’t a new technique by any means we can’t recall seeing it used in a microcontroller project such as this one before. We’ve brought you many Games of Life though, as well as marking John Conway’s passing earlier this year.

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How Much Is That Plotter In The Window?

We live in a strange time indeed. People who once eschewed direct interactions with fellow humans now crave it, but to limited avail. Almost every cashier at the few stores deigned essential enough to maintain operations are sealed away behind plastic shields, with the implication that the less time one spends lingering, the better. It’s enough to turn an introvert into an extrovert, at least until the barriers are gone.

We get the idea that the need to reach out and touch someone is behind [Niklas Roy]’s “Please Leave a Message”, an interactive art installation he set up in the front window of his Berlin shop. Conveniently located on a downtown street, his shop is perfectly positioned to attract foot traffic, and his display is designed to catch the eye and perhaps crack a smile. The device consists of a large wooden easel holding the guts from an old X-Y pen plotter, an Arduino and an ESP-8266, and a couple of drivers for the plotter’s steppers. Passers-by are encouraged to scan a QR code that accesses a web page served up by the ESP-8266, where they can type in a brief message. The plotter dutifully spells it out on a scroll of paper for all to see, using a very nice font that [Niklas] designed to be both readable and easily plotted. The video below shows it in action with real people; it seems to be a crowd-pleaser.

[Niklas] has been incredibly prolific, and we’ve covered many of his interactive art installations. Just search for his name and you’ll find everything from a pressure-washer dancing waters display to a plus-sized pinball machine.

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A Microcontroller Display With A Classic Twist

In a fit of lock-down-induced boredom, [Peter Z] has turned his smartphone into an LCD screen (simulation) via an Android app (German language, Google Translate link), so that a mobile device can be plugged into your favourite microcontroller and the classic HD44780 LCD look can be replicated on its screen.

It doesn’t speak standard HD44780, but rather a custom UART serial protocol, so if you’re looking for something to replace a busted LCD, this isn’t your bag. But if you are looking for a large UART terminal for debugging, with a nice aesthetic, you win.

We’d guess that a serial-to-Bluetooth converter could also be made to function, with a bit of work. The protocol is trivial too, meaning that almost any microcontroller could make use of it. All the code as well as the APK is available from the forum linked above, and there is a YouTube video of it in operation below.

The number one complaint in the comments is going to be that this doesn’t emulate a HD44780, so if that’s really what you want, read this deep-dive into the HD44780 and get hacking.

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BINA-VIEW: A Fascinating Mechanical Interference Display

[Fran Blanche] tears down this fascinating display in a video teardown, embedded below.

These displays can support up to 64 characters of the buyer’s choosing which is controlled by 6 bits, surprisingly only requiring 128 mW per bit to control; pretty power-light for its day and age. Aside from alphanumeric combinations the display also supported “color plates” which we found quite fascinating. The fully decked model would only cost you $1,206 US dollars per unit in today’s money or five rolls of toilet paper at latest street price. And that’s just one digit.

If you dig through the documents linked here, and watch her video you can get an idea of how this display works. There are six solenoids attached to rods at the rear of the device. A lamp shines through a lens onto the back of a plate assembly. Each plate is a strategically perforated grid. When the solenoids activate the selected plates tilt interfering with a stationary grid. This causes the light to be blocked in some regions only.

It seems clear why this never took off. Aligning these seems like a production nightmare compared to things like flip displays and Nixie tubes. Still, the characters have quite a lot of charm to them. We wouldn’t mind seeing a 3D printable/laser cut version of this display type. Get working!

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