All in all, I have to say, #Grobpfottaster2Light worked way better than feared.
The batteries held up flawlessly, the button response time was very quick, no electronics pack died during the event, the wireless link was stable, the DMX worked also over longer cables and most importantly: people had fun :3

The wireless range was also surprisingly good. It only got spotty at around 2/3 of the tram length away from the receiver (depending on the amount of creatures inbetween).

And for having the idea on Sunday, developing the the code from Tue-Thu and building all of the hardware on Friday, the result was really nice :3

Thanks for reading ^w^
Here, have a bonus video of the almost finished system at 3am on the night before the event as a treat:

#FurryTramFFM

And it had only two bugs, that I had to fix live in prod / the tram :D

1) For some reason, the transmitting ESPs would lock up every 20-50 presses while trying to go to light sleep. So I just disabled it and reflashed all buttons. Now they'd draw around 20mA during idle instead of 0.5, but that's still low enough to last the whole event on a 280mAh LiPo.
2) The red "strobe" button had really bad switch contacts and wouldn't trigger reliably, so I had to remap it to the spare button.

Here's another video of the #Grobpfottaster2Light in action, with the fixes applied:

#FurryTramFFM

Hat zum Glück alles problemlos funktioniert und vmtl. sind sogar noch so 40% Energie übrig, trotz dass @NikTheDusky als letzter DJ nochmal richtig Abriss gemacht hat <3 (wie man im Grafana-Screenshot oben sehen kann)

Außerdem hat @xiiFur in so 2 Tagen auch "noch kurz" eine DMX-Funk-Fernbedienung mit Grobhandtastern gebaut, damit die Besucher*innen die Scheinwerfer (mit verschiedenen Effekten) steuern können, ohne Sound-to-Light (ew) oder VJ (Aufwand) <3

(blur for privacy)

#FurryTramFFM

Und heute dann Härtetest bei der #FurryTramFFM (danke @cato)

Acht RGB-W-A-UV-LED-Scheinwerfer, vier Subwoofer, vier Tops, zwei Ventilatoren; für 4 1/2 Stunden Party in der Tram.