Here is a cool 4 digit numitron clock based off of what appears to be an ardunio. Based on the GitHub description:
- Retro glowing numitron display featuring Soviet-era IV-9 numitron tubes
- A DS1307 real time clock with backup battery for accurate timekeeping and alarm memory preservation during loss of power
- Blue LED underlighting for each digit, with customizable fading light patterns
- Programmable alarm
- 12- or 24-hour operating mode with AM/PM indicator light
- Easy display blanking for nighttime use and tube life preservation
- 100% open source hardware and software
- Arduino programming compatibility using standard TTL serial
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