This is a little documentation for the EasyNixie module, before using the module be sure to checkout all the safety guidelines located at: https://www.kickstarter.com/projects/esp32-stick/easynixie. The module uses a pretty high voltage(200V) to power up the nixies, so be sure to keep it unplugged from the PC when you turn the high-voltage on. (Disconnect VPOWER pin->Flash the code->unplug from the pc->connect external source->connect VPOWER pin)