ESP-Huzzah-Nixie-Tube-Clock ESP Huzzah Nixie Tube Clock Created Using: Adafruit HUZZAH ESP8266 Breakout --> MCP23017 --> K155ID1 Build Info: Program: HuzzahNixieClock.ino Schematic: Huzzah2Nixie Schematic.svg Other GitHub References: NTP: tttapa/ESP8266 Other References: MCP23017: How to Connect an MCP23017 I/O Port Expander to an Arduino