Just wanted to share some work I have done on the topper. I had posted about this about a year ago but only just got back to it and finished off the build.
From what I have seen on the forums, mods are all down to personal preference. Keeping it close to stock or going all out, there is no right or wrong way. Some people may have some ideas or electronics know how on how to do this better/differently. Happy to share the details, code, parts if anyone is interested in doing something similar. For me I wanted a mod that doesn't change the topper permanently (well only slightly with clear luminous paint) and could be brought back to stock. The topper also runs independent of the pinball (needing no wiring into the cabinet) but make things less static than just the un-lit topper.
When powered (12v supply) the UV light is on, TFTC lettering glows with luminous paint. 3 flashers are installed for simulated lighting strikes that run on a random timer (usually once every few minutes) with random intensities/duration followed shortly by a random rolling thunder sound clip. There are 14 different sound clips. I added in some crypt keeper sound bytes (mostly from the Christmas album) as it was the best quality crypt keeper recordings I could find. Some editing was done in Audacity to fade in and out or shorten/edit some of the crypt keepers call outs.. "The fastest way to a mans heart is with a pick axe!"
Topper is mounted on a board with 4 magnetic feet.
Luminous glow in the dark green paint has been added to the lettering and a UV strip light installed. There is no visible difference to the lettering in daylight.
Arduino Nano is running a micro SD card and 3 flashers
Small amp running 2 speakers with volume control. Can easily just let the topper run with random lightening flashes and no callouts/thunder.
Video here. Taken during the day in a lit room but gives an idea on what it does.
20200109_092642 (resized).jpg20200109_103413 (resized).jpg20200109_103438 (resized).jpg20200109_103543 (resized).jpg