Nixie Clock on ESP8266 module

Nixie Clock on ESP8266 module with synchronization with NTP server. Simple circuit.

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This is my new project "Nixie clock on ESP8266". Here I used the decoder 74141 and the neon indicators IN-12.

1) Powered by USB port. Low energy consumption.
2) Connects to the network wi-fi.
3) No time setting required.
4) Synchronization with NTP server.
5) Firmware update by air (OTA).

The project uses dynamic indication and a simple step-up voltage converter up to 180V.
Supply voltage 5V and current consumption about 200 mA.

License: Open Source Licensing

JPEG Image - 1.20 MB - 01/18/2020 at 08:59




- 9.39 kB - 06/12/2017 at 05:33


Face panel for nixie clock .stl

For 3D printer. Face panel for nixie clock box.

Standard Tesselated Geometry - 43.64 kB - 05/30/2017 at 16:45


box for nixie clock.stl

For 3D printer. Box for nixie clock.

Standard Tesselated Geometry - 6.92 kB - 05/30/2017 at 16:42



pinout ESP8266

Portable Network Graphics (PNG) - 159.35 kB - 05/30/2017 at 16:39


  • 4 × IN-12 Nixie Tube
  • 1 × ESP8266-12F
  • 1 × 74141 Electronic Components / Misc. Electronic Components
  • 1 × LM1117-3.3 Power Management ICs / Linear Voltage Regulators and LDOs
  • 1 × TLP627 Opto and Fiber Optic Semiconductors and ICs / Optocouplers and Optoisolators

View all 7 components

  • Total board update 10.22.2017

    V.G.C.10/22/2017 at 17:12 0 comments

    Warning! Total board update 10.22.2017 


    1. Simplified the scheme of high voltage control. Instead of transistors added high-voltage optocouplers (TLP627, you can use TPL627-4)

    2. Improved step-up converter voltage. Now it works more effectively.

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  • 1
    Step 1

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rockdomenik1105 wrote 05/29/2021 at 12:16 point

How to get a detailed description with a diagram?

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Cezary wrote 07/13/2018 at 06:52 point

Hello. Great project, planning to build it soon. How difficult would be adding 2 lamps for seconds display from programming perspective? 

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rlb-designs wrote 07/17/2017 at 08:37 point

Hi Just joint. how are you programming the ESP-12F? Are you using a USB/Serial convertor or a Arduino.


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V.G.C. wrote 07/29/2017 at 08:07 point

Hello! Yes, I used a USB/Serial converter first but then OTA update.

You are welcome.

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rlb-designs wrote 08/02/2017 at 10:49 point

Hi, Thanks I thought that's how your were doing it. I see your only driving 4 nixie's could you not add 2 more for the seconds instead of the LED's? By adding the additional transistors etc. from GPIO1 and GPIO0, would you need to mod the sketch too.



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Paul Andrews wrote 06/24/2017 at 04:50 point

Is that really a 200mH inductor? Nothing that size on Digikey or Mouser.

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Maksim Surguy wrote 07/11/2017 at 03:41 point

@V.G.C. I have the same question as ^, could you specify the inductor specs or alternatives please? 

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V.G.C. wrote 07/29/2017 at 08:12 point

I used to transformer from mobile charger as inductor. Used high voltage coil.

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V.G.C. wrote 06/12/2017 at 04:19 point

Hello! I used 2SC4706 and A733 transistor. 2SC4706 need connect to coil. 

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Maksim Surguy wrote 06/11/2017 at 15:54 point

Hi! What transistors / FETs did you use in the step up voltage converter? The schematic is not saying about that so just wanted to check! 


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