This is a one-tube Nixie clock - see my web site for more info.

Features include:

• Any Nixie tube can be driven using an adapter (several on here at OSHPark).
• It is driven by an ESP8285, so it has built-in WiFi.
• It is powered from a USB port.
• KiCAD project is on GitHub
• It can be programmed through the USB - source code is available on GitHub.
• It has an I2C expansion port.
• It has a light sensor for auto-dimming.
• The default application:
  • Synchronizes the time with the internet
  • Presents a web configuration GUI
  • Has five presets for easy switching between different configuraions
  • Has a blanking period
  • Can drive a tube either as a clock, or a counter
  • HV can be modified from the GUI to increase the current through the tube.
  • You can control the backlighting