I built an open-source bridge app that reads real-time data from Train Sim World 6 (HTTP API) and drives 13 physical LEDs on an Arduino Leonardo via 5-pin Charlieplexing, replicating the German MFA indicator panel (PZB/SIFA/LZB). Features: 7 train profiles: BR101, Vectron, BR146, BR114, BR411 ICE-T, BR406 ICE 3, Bpmmbdzf Accurate PZB 90 behavior: Wechselblinken, restricted mode, overspeed, emergency LZB indicators: Ende, Ü, G, S with fault blinking SIFA warning + emergency Door status (left/right) Befehl 40 MFA popup window + web panel accessible from any phone on your LAN (with QR code) Two Arduino firmware variants: Serial-only (simple, 5 pins) or full Joystick + LED (all 20 pins, buttons, encoders, switches) Multilingual GUI (EN/DE/IT) Free download (Windows EXE, no install needed) + full source code + Arduino firmware: GitHub: https://github.com/Giako888/bridge-trainsimworld-zusi3-arduino Happy to answer questions or take feature requests!