DORS/CLUC 2025 · Croatia · 2025

DORS/CLUC 2025 Badge

NFC treasure-hunt and LED badge

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.

DORS/CLUC Croatia NFC STM32L073 ST25R3916 IS31FL3731 LED Matrix USB Flipper Zero Treasure Hunt

EventDORS/CLUC 2025

SeriesDORS/CLUC

LocationZagreb

CountryCroatia

People

Authors & Credits

acrylic-plate cutting support

Goran Mahovlić

Explicitly thanked in the 2025 writeup for cutting acrylic plates.

Source

badge designer, firmware author, and production lead

Igor Brkić

The 2025 writeup describes the designer's work on hardware, firmware, late assembly, testing, and documentation.

Source

laser-cutter support

RADIONA

The 2025 writeup thanks RADIONA for providing the laser cutter.

Source

Why It Mattered

DORS/CLUC 2025 shows an event badge lineage iterating quickly: the 2024 social quest became NFC treasure hunting, Flipper-emulation lore, USB reuse, and a frank production story about late boards, missing assembly parts, and manual QFN soldering.

Hardware

The writeup documents STM32L073 after an STM32L053 capacity shortfall, ST25R3916 NFC frontend, IS31FL3731 LED matrix driver, charlieplexed LEDs behind dark acrylic, USB, battery holders, and an NFC antenna designed with ST tooling.

Software & Apps

Documented modes include conference quest behavior, USB configuration menu, brightness and scrolling-speed settings, clock mode, simple game, passthrough mode that prints button/click/NFC events over USB, and a Linux desktop-notification script in the repository.

Lore

The 2025 badge sold out on the first day, attendees hunted hidden NFC tags, and one participant cracked the game by extracting tag IDs from firmware and emulating them with a Flipper Zero. The writeup records an all-night final assembly and firmware push before the conference.

Lifecycle

Add-ons & Upgrades

attendee hack historical

Flipper Zero NFC quest emulation

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.

Compatibility: DORS/CLUC 2025 Badge

Source

badge quest historical

NFC treasure hunt

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.

Compatibility: DORS/CLUC 2025 Badge

Source

post-event utility mode historical

USB passthrough and desktop notifier mode

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.

Compatibility: DORS/CLUC 2025 Badge

Source

Operational history

Issues & Camp Impact

production all-nighter moderate

The 2025 writeup records late boards, missing assembled ST25R3916 and IS31FL3731 chips, manual QFN soldering, firmware finishing, flashing, battery-holder soldering, acrylic mounting, and documentation work through the night before the event.

The badge shipped, but the record preserves a realistic production-risk story for small-run event hardware.

Confidence: designer writeup
Status: historical
Timeframe: two days before conference
Source note: DORS/CLUC 2025 Badge writeup.

RTC hardware omission note

The clock mode did not work properly because the board omitted the RTC crystal.

The badge still had useful modes, but the entry records the documented feature limitation instead of implying a fully working clock.

Confidence: designer writeup
Status: historical
Timeframe: post-assembly behavior
Source note: DORS/CLUC 2025 Badge writeup.

missing rights-cleared image note

No documentary photo or official upstream raster render of the original DORS/CLUC 2025 badge has been cleared for public reuse. The repository embeds real photos such as `images/hello.jpg`, `images/tag.jpg`, and `images/dataex.jpg`, but the README only licenses code under MIT and does not give an image or documentation reuse basis.

Keep the catalogue image empty until a licensed original badge photo is cleared with attribution and reuse rights.

Confidence: project image provenance and repository recheck
Status: needs licensed original replacement
Timeframe: current catalogue build
Source note: Project image provenance, HYPERGLITCH article photos, and hyperglitch/dc2025badge README license wording.

Resources

DORS/CLUC 2025 badge repository source repo · Open GitLab repository linked from the 2025 writeup. DORS/CLUC 2025 badge writeup designer writeup · Hyperglitch writeup covering NFC quests, LED display, USB modes, production challenges, and Flipper Zero lore. DORS/CLUC badge manual official manual · Official badge manual linked from the 2025 writeup.

Sources

DORS/CLUC: DORS/CLUC badge manual Retrieved 2026-05-15 · Official manual linked from the 2025 badge writeup. GitLab / hyperglitch: dc2025badge Retrieved 2026-05-15 · Primary source repository linked from the 2025 writeup. HYPERGLITCH: DORS/CLUC 2025 Badge Retrieved 2026-05-15 · Primary designer writeup for the 2025 NFC quest, LED display, USB modes, production challenges, and Flipper Zero emulation lore.