(Check my first clock)

This is a Nixie Clock design using IN-12 soviet neon tubes and an Arduino connected to a RTC clock. Two different cases are provided.

It has a NeoPixels port and locations for SMD WS2812 LEDs (not tested because I added them after building my own clock).

Pictures on my website

The clock automatically shuts down after 15s.

• Short press : on/off
• Double press : switch to always on mode

• Short press : increment the value
• Maintain press : increment the value faster

• Short press : change color/effect
• Maintain press : change brightness

• ShiftRegister74HC595
• FastLED
• DS3231
• FlashStorage_SAMD

• AUTO_OFF_DELAY automatic shutdown after X seconds
• ALWAYS_ON_TIME define at which time the display stays on
• INVERT invert the digits (used for the full-case)
• SIX_DIGITS enable seconds (requires extension board)
• LEDS_NUM number of NeoPixels
• LEDS_TYPE color order of NeoPixels

This a simple stand which leaves the circuit exposed. It has no LEDs button.

This is a fully closed case. The tubes sockets are not soldered to the board but integrated in the structure and connected with a lot of wires.

There is a "nixie-display_extension.fzz" PCB design which allows to add two additional tubes. It will require to "hack" into the main board to get the necessary data lines.

• LED : output of the last Neopixel
• DS : output (Q7') of the last shift register
• STCP : any of the STCP pins of the shift registers, or pin D1 of the Xiao
• SHCP : any of the SHCP pins of the shift registers, or pin D2 of the Xiao
• 5V/GND : from the main terminal
• 170V : output of the NCH8200HV

The Arduino code, the Fritzing design and SolidWorks files are distributed under the Creative Commons 3.0 BY-SA license.