arduino-nixie VS 7-day-alarm-clock

I also wanted to be able to tweak the code running on my clocks, and ended up with several clocks from RLB Designs, for which I wrote my own software. The most nixie-specific part of the code (which I imagine is shared in principle with most other kits) loops over the digits to display them one at a time (or two at a time in RLB's case) in a technique called multiplexing, which simplifies the hardware requirements. You usually just write updated display values into a buffer whenever you have them, and the loop keeps the multiplexing scheme going (it is the only part of my code that uses delays, which I would like to get rid of).

Indeed, it's the inversion part I need to figure out. I've seen some displays with two coils for each vane, one for each direction, so it's just a matter of applying that transitory power to one or the other; but with just one, some kind of H-bridge is required, and really the challenge is how best to implement that with a reduced component count via multiplexing (e.g. driving one digit or one vane at a time). I maintain an Arduino clock program that already supports various display types – just need to find the time to figure it out and add support for these too!

So I built myself an alarm clock, using a Sparkfun 1602 SerLCD as a display. I created a double-height font for the digits with a class that inherits from Print. And I did all of this with the Arduino IDE installed from a Snap on Ubuntu, so the code was compiled using avr-gcc version 7.