Nice project :). Been thinking making an artificial sunrise led system (approximating the right spectrum, and possibly adding light birdsong) for a while, just to lower stress. Though, I was considering a series of smaller modules that communicate wirelessly, rather than one big one, to aid in recreating the ambience. Need to come up with a convenient way to power the modules though, don't really fancy wires all about the place!

Do you have the schematics to drive LM317? Do you not need any other components? I'm confused because current is being controlled by LM317, which is a voltage regulator... or is it by trying to maintain constant voltage you can control the current by manipulating the resistance? ^^;; confused here

I'm using the LM317 in constant current mode, and using a bit of a hack to PWM it... again, not the best way, but I had a cheap little mosfet on hand, and I used it to short the ADJ pin on the LM317 to ground, disabling the 317. When the mosfet is not conducting, current flows through the resitor to VOUT, making it a normal constant current source :)

I have to check your code later today...  one of my #fixietube clock projects has an Esp12 in there and needs to know the time to turn of the blue Leds at night.

That code is only useful for fuzzyalarm-clock-like stuff. Here is some much more polished and clock-ready code :) http://www.soniktech.com/NixieNet/

I really like the idea of stuffing modern components into tubes; have you thought about expanding it behind just the nixies and 'tubifying' the ESP or power regulator, like some tube radio enthusiasts do for power rectifier tubes?

Yay the cute nixies :) nice project, the weather add-on looks nice.

I would use it for the smaller 2-digit display that I currently use for showing the temperature pulled from an online weather API, so fuzzy is fine ;) The clock itself has one of the fancier I2C RTC modules and an Arduino Mini running on 5V - I'm almost happy with that, if there wasn't the daylight saving time. 

Do you mean stacking up more boards and put them further into the jars? Hmm. I wanted to do something like this with a LED cube in a jar, put all the electronics and battery in the lid. 

I can't find the project again, but I remember seeing something where someone was renovating a vacuum tube radio, and they replaced a few components in the power supply path with solid state equivalents by gutting the original vacuum tubes making up the rectifier etc and stuffing modern parts into the now-empty tubes, keeping the old timey look until you got close and saw semiconductor diodes inside the glass envelope