Here is a cool 4 digit numitron clock based off of what appears to be an ardunio. Based on the GitHub description:
The TubeClockDB / Tube Clock Database is a collection of nixie clocks, vfd clocks, vacuum fluorescent clocks, crt clocks, scope clocks and oscilloscope clocks. We will feature just about anything: fully assembled clocks ready to purchase, kits, or even individual nixie tubes. If there is something that you think would make this a better resource, please contact us.
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