Country dossier
Worldwide badge coverage for Croatia, grouped into seeded badges, event editions, add-ons, operational issues, resources, and evidence sources.
Seeded artifacts
The first electronic DORS/CLUC conference badge, with a 2.66 inch monochrome e-paper display, badge-to-badge IR discovery, twelve special-badge unlocks, light-sensor web configuration, blue LED patterns, open KiCad and firmware files, and OSHWA certification.
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.
Events
The first electronic DORS/CLUC conference badge year, with e-paper, IR badge-to-badge discovery, light-sensor web configuration, and open hardware files.
The second electronic DORS/CLUC badge year, with NFC quests, LED-display modes, USB passthrough, open source files, and public production-challenge lore.
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.
Each badge periodically transmitted a unique IR code and listened for other badges; seeing twelve special speaker/organizer badges unlocked parts of a hidden image.
A static web page encoded settings by blinking full-page colors that the badge decoded through its ambient light sensor.
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.
The 2024 badge released KiCad, firmware, web configuration, production data, and a programming-jig model, with CERN-OHL-P-2.0 hardware and MIT firmware licensing.
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.
The public badge page, image archive, and API point at a real badge photo with source URL, license basis, attribution, and cutout-processing notes preserved.
The source documents the practical edge case and mitigation: slowing down the transmission speed helped on some devices.
Keep the catalogue image empty until a licensed original badge photo is cleared with attribution and reuse rights.