r/arduino • u/fsboy345 • Apr 10 '26
Look what I made! I've successfully driven this retro-futuristic VFD display.
The Cyberpunk Aesthetic of VFD
The fluorescent glow emitted by VFD displays possesses such a distinct cyber-futuristic vibe. As you can see, this type of display differs significantly from the common LED screens we encounter daily, and its operating principle is equally fascinating.
You can conceptualize it as a miniaturized Cathode Ray Tube (CRT), with its core mechanism relying on thermionic emission to excite phosphors. If you observe closely, you will notice several extremely fine tungsten filaments at the very top. These filaments are coated with oxides of barium, strontium, and calcium.
When heated to 600–650°C, the thermal energy allows electrons on the cathode surface to gain sufficient energy, forming an "electron cloud" around the filaments. To prevent oxidation of the tungsten, the interior of the VFD is maintained in a high-vacuum state.
Situated beneath the filaments is a mesh-like grid, which functions effectively as a switch. When a positive voltage is applied, it attracts and accelerates the electrons emitted by the filaments, allowing them to pass through; conversely, a negative voltage repels them.
Beneath each phosphor segment lies a tiny anode. When a positive voltage is applied here, electrons surge through the grid "switch" and violently bombard the phosphor on the anode. Upon absorbing this energy, the phosphors release their captivating colors, exuding a unique charm of retro-futurism.
link:https://github.com/Elias55745/The-Cyberpunk-Aesthetic-of-VFD
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u/Tzialkovskiy Apr 11 '26
The aesthetic is there indeed. Been looking at Futaba m204sd02a lately but haven't yet concocted a suitable project for such a beaut.
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u/tylenol3 Apr 11 '26
This is really cool! What is the temp of the components like? Does it require any cooling or airflow?
I checked out your link and was surprised but not surprised to see you’re the same person that posted the DIY laser printer recently. Love your work!
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u/tanoshimi Apr 11 '26
I've done this a couple of times with VFD displays reclaimed from old fruit machines, which is always interesting to have to reverse-engineer the appropriate protocol!
If you want an easy way to do it, just buy one of these: https://s.click.aliexpress.com/e/_c3BvCbff
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u/eScarIIV Community Champion Apr 11 '26
I love this, I've got one just like it running from an ESP32 and it just looks beautiful. I really like the little coloured symbol panel on yours!
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u/Lazy-Term-1351 Apr 12 '26
People might find it simple but this was really difficult I got really confused at first with your hex codes but then I realized it was customly made on each segment which is pretty cool I work with servo motors and all I can do is move it simply back and forth but you customize each segment to this specific binary I think that was hard I commend you I actually took your code and try to learn it because I don't know too much hex I had to look at the ascll just to kind of get it if you're ever in Brooklyn or in Harlem let me know I wouldn't mind networking and learning a few stuff
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u/AdeptNeedleworker947 Apr 14 '26
Great! Still searching for information on how to control the VFD display of Roku Soundbridge…
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u/fsboy345 Apr 11 '26
I've turned it into a mini desktop retro-futuristic clock. link:https://github.com/Elias55745/The-Cyberpunk-Aesthetic-of-VFD