DORS/CLUC
The second electronic DORS/CLUC badge year, with NFC quests, LED-display modes, USB passthrough, open source files, and public production-challenge lore.
Zagreb · Croatia · 2025
The second electronic DORS/CLUC badge, built around NFC tag hunting, badge-to-badge interaction counters, LED-display modes, USB configuration and passthrough behavior, a simple game, open source files, and a public production all-nighter writeup.
Lifecycle
The designer records that an attendee cracked the game by extracting tag IDs from firmware and emulating them with a Flipper Zero, which was encouraged.
The 2025 badge asked attendees to find NFC tags hidden around the conference area and also interact with other badges for a counter-based quest.
The badge could print button, click, and NFC events over USB, accept content over USB, and work with a repository script that forwarded Linux desktop notifications to the badge.
Operational history
The badge shipped, but the record preserves a realistic production-risk story for small-run event hardware.
The badge still had useful modes, but the entry records the documented feature limitation instead of implying a fully working clock.
Keep the catalogue image empty until a licensed original badge photo is cleared with attribution and reuse rights.