Nixie tube thermometer


After seeing a picture of a thermometer using a bargraph style nixie tube in place of a mercury column, [Juergen Grau] decided he wanted to build his own. Dubbed the “Nixietherm”, his replica looks even better than the original. He used an IN-9 Nixie tube mounted on top of a custom plastic case, all powered by a 5v USB connection. He points out that his version does not use a PIC or any other sort of processor – it is built entirely from analog circuits. There are some RGB LEDs embedded in the plastic case that make for a cool effect, but they seem to simply cycle through the colors rather than represent how warm or cold the temperature is at any given time.

[Juergen] does not give a lot of details regarding the build as far as PCB layout or a parts list is concernred, but most of that can be extrapolated from the wiring schematic he provided. He also mentions that he will be making kits available in the near future. Be sure to keep reading to see the thermometer in action.

Thanks [Brian]


  1. Squintz says:

    That looks very nice. Well done.

  2. 1000100 1000001 1010110 1000101 says:


  3. Knuckleball says:

    THAT is cool!

  4. Freax says:

    really nice, would be cool to have! One word of warning though: Check the datasheet, most of this sort of tubes don’t like it if they display the same value for a long time (it shortens their lifetime).
    And the term “Nixie” doesn’t really fit as far as i understand…

  5. bogdan says:

    Wow. This looks super great!

  6. sqnewton says:


  7. Mike says:


  8. Fallen says:

    Impressively clean build. Kudos.

  9. Brennan says:

    I would seriously consider buying a kit for this, the craftsmanship is very very good. I also love that it is completely analog.

  10. zool says:


  11. sean says:

    I would love this in kit form.

  12. drew says:

    every time I think everything cool that could be possibly be built with nixie tubes has been done, I am corrected.

    This is just tons of awesome.

  13. Tom says:

    I recently purchased a Nixie kit from Jurgen. Quality parts all the way. Excellent support too. The kit had a few issues with a couple of parts and he sent me out replacement parts without question (leds & spacer) Looks interesting, but would love if it had a button to see what the current temp is rather than have the tube on all the time.

  14. Victor says:

    Looks really cool…. Temperature range might be a bit high though, in winter my room temperature drops to 10-12 degrees Celsius at night. And that’s when you see the lights at best!

  15. Alex says:

    Absoloutely butiful build! The LEDs should indicate temp also imo, all blue if lower temp or all red if higher temp etc.. Proximity detection for displaying the value would be a good addition too for future work :-)

  16. addidis says:

    Dam thats a good looking thermometer

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