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MSP430 based Nixie tube clock.     I was looking for some nice Nixie tube digit images so I could add them to my EduKit library, but I couldn't find any usable ones. I decided to just buy few of

This is how the display case option will look like. Standoffs will be white nylon, not brass. Screws will be silver. Faceplate can be used in 2 different ways, horizontal and vertical.  

Little demo  

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  • 4 months later...
  • 11 months later...

Time to upgrade my Nixie clock.

Here's what's new:

1. the number one complaint about my current version is battery, or lack of it, done. The new version will come with backup battery.

2. hour and minute divider (colon,) done. Added two INS-1 Nixie tubes. 

3. improved HV power supply, it is now more efficient and quieter.

Few other tiny improvements.


Should be ready for holiday season.




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  • 2 weeks later...
  • 3 weeks later...

Any day now @@cubeberg :)


I am now adding software features requested by users. 

There were few requests for effects that will prevent cathode poisoning, so I will add two effects, slot machine and blanking.

Slot machine will basically scroll all numbers for a few seconds every so often.

Blanking will keep display off and show time for few seconds every few seconds.




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I had one request for alarm, but I don't think many would use this clock as an alarm clock.

There's room for a small, 12mm piezo, but I figured if someone wants to add alarm, they can either use available J1 header or use (flash) digits, separator, or LEDs to signal alarm. 


Also, couple of days ago, I was thinking about adding IR receiver (utilize J1 for this.)

Several people mounted this clock in enclosures or high above, making switches hard to reach. IR receiver in combination with cheap IR xmtr or TV remote, would allow setting time/functions remotely. Maybe next revision.

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@@RobG - I'd have to agree on the piezo - this type of clock is probably too bright for an area where you'd want an alarm.  I have a spot for one on my VFD clock but only populated it for my first test device.  I have three on my desk at work, one with a buzzer that beeps on startup - I should honestly pull the thing off of the board.

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Here's short video.


I am looking for suggestions re separator and AM/PM indication. 

I have 4 modes for the separator, off, on only when PM, blinking every second, and one blink AM/two blinks PM

My wife says double blinking is annoying, so what do you think?



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Great clock Rob. I agree with your wife and find the blinking distracting also :-)


Here is a thought for an enclosure. Keep everything clear acrylic but include sides and have right angle pushbuttons accessible through the side - something like these: https://www.aliexpress.com/item/5-Pcs-Blue-Round-Cap-Right-Angle-Momentary-Tact-Pushbutton-Switch-12-X-12Mm-X-8Mm/32752171836.html?spm=2114.01010208.3.27.aSrfjS&ws_ab_test=searchweb0_0,searchweb201602_4,searchweb201603_1&btsid=42e3f2a1-9de1-4e95-b17b-7a8120f6bb2c

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