A 3D-Printed Nixie Clock Powered By An Arduino Runs This Robot

While it is hard to tell with a photo, this robot looks more like a model of an old- fashioned clock than anything resembling a Nixie tube. It’s the kind of project that could have been created by anyone with a little bit of Arduino tinkering experience. In this case, the 3D printer used by the Nixie clock project is a Prusa i3 (which is the same printer used to make the original Nixie tubes).

The Nixie clock project was started by a couple of students from the University of Washington who were bored one day and decided to have a go at creating their own timepiece. After a few prototypes and tinkering around with the code , they came up with a design for the clock that was more functional than ornate.

The result is a great example of how one can create a functional and aesthetically pleasing project with a little bit of free time.

Confused yet? You should be.

If you’ve read this far then you’re probably scratching your head and wondering what has come over Hackaday. Should you not have already guessed, the paragraphs above were generated by an AI — in this case Transformer — while the header image came by the popular DALL-E Mini, now rebranded as Craiyon. Both of them were given the most Hackaday title we could think of, “A 3D-Printed Nixie Clock Powered By An Arduino Runs This Robot“, and told to get on with it. This exercise was sparked by curiosity following the viral success of AI generators, which posed the question of whether an AI could make a passable stab at a Hackaday piece. Transformer runs on a prompt model in which the operator is given a choice of several sentence fragments so the text reflects those choices, but the act of choosing could equally have followed any of the options.

The text is both reassuring as a Hackaday writer because it doesn’t manage to convey anything useful, and also slightly shocking because from just that single prompt it’s created meaningful and clear sentences which on another day might have flowed from a Hackaday keyboard as part of a real article. It’s likely that we’ve found our way into whatever corpus trained its model and it’s also likely that subject matter so Hackaday-targeted would cause it to zero in on that part of its source material, but despite that it’s unnerving to realise that a computer somewhere might just have your number. For now though, Hackaday remains safe at the keyboards of a group of meatbags.

We’ve considered the potential for AI garbage before, when we looked at GitHub Copilot.

2022 Sci-Fi Contest: Nixie Calculator Is Resplendent In Walnut Enclosure

The Nixie tube is one of the most popular display technologies amongst the hacker and maker set. Glowing numerals can warm even the coldest heart, particularly when they’re energized with hundreds of volts. [ohad.harel] used these glorious displays to build the TORI Nixie Calculator, with beautiful results. 

The build uses seven IN-12 Nixie tubes for numerals, along with an IN-15A which displays mathematical symbols like +, %, and M. It’s equipped with a 32-key keyboard using mechanical key switches. Everything is wrapped up in a beautiful walnut enclosure that fits the tubes and keyboard perfectly, giving the final build a nice mid-century aesthetic.

Impressively, it goes beyond the basic usual calculator functions, also handling conversions between metric and imperial units. It’s a nice feature that would make it a wonderful tool to have on one’s desk beyond the simple aesthetic charm of the Nixie tubes.

Nixie projects never seem to die. Their beauty and warmth captivates builders to this day. Indeed, we’ve even seen some makers go to the trouble of creating new tubes from scratch!

Nixie Spectrum Display Has Seven Bands

A spectrum visualizer is always a fun project, but we really liked [Yannick99]’s take on it since it uses seven IN-13 Nixie tubes for the display. The tubes, of course, need high voltage so part of the project is a high voltage power supply. The spectrum part is a little more ordinary using an op amp and an MSGEQ7 filter IC.

The chip feeds a microcontroller and the microcontroller, with a little help, drives the tubes. The results are great, as you can see in the video below. There are several other videos showing the testing and prototyping, too. The MSGEQ7 is a cute chip that offloads the usual FFT logic from the microcontroller. It does all the work and communicates in a very unusual way. You reset the device and then pulse the strobe input. This causes an analog voltage to appear on the output pin corresponding to the 63 Hz band level. Another strobe pulse selects the next band and you just repeat indefinitely, something the microcontroller is good at.

The only issue, of course, is locating IN-13 tubes. They are around if you look for them, but they may not be cheap. Expect to pay about $20 each for them, more or less. We wondered if you could make an LED look-alike replacement. If you are wondering about the lifespan of these tubes, someone’s already done the testing.

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A six digit Nixie clock on a desktop

Upcycled Nixie Clock Fit For A Friend

Building a clock from parts is a rite of passage for makers, and often represents a sensible introduction into the world of electronics. It’s also hard to beat the warm glow of Nixie tubes in a desktop clock, as [Joshua Coleman] discovered when building a Nixie tube clock for a friend.

The original decision to upcycle the chassis from an unrepairable Heathkit function generator came a little undone after some misaligned cutting, so the front panel ended up being redesigned and 3D printed. This ended up being serendipitous, as the redesigned front panel allowed the Nixie tubes to be inset within the metal chassis. This effect looks great, and it also better protects the tubes from impact damage.

Sourcing clones of the 74141 Nixie driver ICs ended up being easier than anticipated, and the rest of the electronics came together quickly. The decoders are driven by an Arduino, and the IN-4 Nixie tubes are powered by a bespoke 170 volt DC power supply.

Unfortunately four of the tubes were damaged during installation, however replacements were readily available online. The gorgeous IN-4 Nixie tube has a reputation for breaking easily, but is priced accordingly on auction sites and relatively easy to source.

The build video after the break should get any aspiring Nixie clock makers started, but the video description is also full of extra information and links for those needing help getting started.

We’re not short on clock hacks here at Hackaday, so why not check out a couple more? This retro-inspired LED clock looks like its right out of a parallel universe, or maybe this stunning Nixie clock driven by relays will strike your fancy.

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Closeup of the car dash with nixie tubes

Retro Future Nixie Corvair Instrument Panel

The future we know today looks very different than the one envisioned in the 60s and 70s. For starters, it has far too few Nixie tubes. An oversight [nixiebunny] wants to address with his Nixie tube instrument panel.

All the essential info is there: engine temperature, tachometer, speed, battery voltage, and even odometer. You might have noticed that there isn’t a clock. The justification that [nixiebunny] gives is that he’s always wearing his Nixie watch, so a clock in his car seems redundant. There is also a gap in the panel to allow an oil pressure display. Corvairs are known for throwing belts next to the oil sender, so any attached sensor needs to be designed well and thought through. A Teensy receives engine telemetry data (no OBDII port to hook into — GM didn’t come out with the first OBD port until the 80s) from the engine bay. The data is transformed into SPI data sent to the 74HC595 shift register chain via a CAT5 cable. Details are a little sparse, but we can see a custom PCB to fit the shape of the hole in the dash with the different Nixie tube footprints silkscreened on.

We love seeing Nixie tubes in unexpected places. Like this POV Nixie clock or this Nixie robot sculpture.

A black PCB with four numeric Nixie tubes on the top, showing 9:26. Under them, a group of black relays is located.

Relay-Driven Nixie Clock Gets You To Stop Scrolling

We don’t often get a Tips line submission where the “Subject” line auto-translates as “Yoshi Yoshi Yoshi”, linking to a short video by [Yasunari Industries] (embedded below). For many, it might be hard to tell what this is at a first glance – however, if the myriad of relays clacking won’t draw your attention, the four Nixie digits on the top definitely will! The gorgeous black PCB has two buttons on the bottom, incrementing hour and minute hours respectively, and observant readers will notice how the LEDs near the relays respond to binary-coded-decimal representation of the digits being shown. This appears to be a relay-based clock with Nixie tubes for digit outputs, and on a scale from “practical” to “eye candy”, it firmly points towards the latter!

The project’s description is quite laconic, but it’s fun to try to figure out what is what based off the few pictures available. The top part with the Nixies and the PIR sensor (presumably for conserving the Nixie tube resources) is V-scored, and a small jumper PCB on the back connects the Nixie module to the relay board – likely, we might see these boards reassembled in a different form-factor, or perhaps find their way into [Yasunari Industries]’ different projects altogether! We can see a Digispark board in the bottom right corner, and wonder if, with addition of that, this board is able to function as a standalone clock — hopefully it does, because that’s one gorgeous addition. And, of course, it all couldn’t happen without help of a bunch of red wires on the back of the board – the author says that some segments were reversed, and the high-voltage PSU section of the board was mis-wired.

Nixie tubes have a dedicated fan base over here, and we keep covering projects that find yet unexplored ways to use Nixies, such as a circular FFT display, or a high-speed camera calibration fixture. Sometimes, Nixie tubes feel like this special sauce you can add to your creation, which explains their popularity in all kinds of barely even counting-adjacent projects, like this TODO indicator. And when we run out of Nixies, we find ways to imitate them – whether it’s with tiny IPS displays, or with layered laser-cut acrylic!

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Nixie clock from a frequency counter

A Nixie Clock, The Hard Way

Notice: no vintage Hewlett Packard test equipment was harmed in the making of this overly complicated Nixie clock. In fact, if anything, the HP 5245L electronic counter came out better off than it went into the project.

HP 5245 hand-wired backplane
Beautiful hand-wired backplane in the HP 5245 counter.

We mention the fate of this instrument mainly because we’ve seen our fair share of cool-looking-old-thing-gutted-and-filled-with-Arduinos projects before, and while they can be interesting, there’s something deeply disturbing about losing another bit of our shared electronic heritage. To gut this device, which hails from the early 1960s and features some of the most beautiful point-to-point backplane wiring we’ve ever seen, would have been a tragedy, one that [Shahriar] wisely avoided.

After a bit of recapping and some power supply troubleshooting, the video below treats us to a tour of the Nixie-based beauty. It’s a wonderful piece, and still quite accurate after all these decades, although it did need a bit of calibration. Turning it into a clock non-destructively required adding a little bit of gear, though. Internally, [Shahriar] added a divide-by-ten card to allow the counter to use an external 10-MHz reference. Externally, an ERASynth++ programmable signal generator was used to send a signal to the counter from 0 Hz to 23,595.9 kHz, ramping up by 100 Hz every second.

The end result is the world’s most complicated 24-hour clock, which honestly wasn’t even the point of the build at all. It was to show off the glorious insides of the counter, introduce us to some cool new RF tools, and as always with [Shahriar]’s videos, to educate and inform. We’ve always enjoyed his wizardry, from his look into automotive radars to a million-dollar scope teardown, and this was another great project.

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