Security Fest
The completed May 28-29, 2026 Security Fest edition in Gothenburg. Its public firmware repository calls the associated artifact an official, small hackable conference badge and documents an RP2040, LED matrix, buttons, USB surface, and public source tree; allocation, final production revision, and image rights remain unproven.
Elite Park Avenue Hotel, Gothenburg · Sweden · 2026
Security Fest 2026's public firmware repository identifies this as the official conference badge: a small, hackable RP2040 device with a 9×9 LED matrix, six buttons, USB surface, and public firmware. The official event site confirms the completed May 28-29 Gothenburg conference, while a contemporaneous attendee report credits Carl Vargklint's badge work. Allocation and delivery are not documented.
Lifecycle
The public README documents a 9×9 IS31FL3731 charlieplexed LED matrix and four front LEDs as the badge's visible interaction surface.
The repository's public Arduino/C++ source describes display states, animations, games, and personalization for the badge without establishing a final production firmware image for every unit.
The README documents USB CDC, controller/HID-capable USB behavior, an SAO port, and marked GPIO. It does not identify a supported add-on ecosystem, compatibility list, or final per-unit wiring revision.
Operational history
The record can document a real event artifact without converting the public source trail into unsupported issuance or credential claims.
Hardware detail remains source-bounded, and the catalogue does not claim that every shipped board matched the repository's documented configuration.
Source code can be linked as evidence, but no repository media or event imagery is copied into the public catalogue and the badge remains image-free.
The Sweden record remains source-backed and image-free rather than copying source-page media, documentation screenshots, event photos, social media, placeholders, or generated approximations.
The catalogue records their existence at a high level but does not publish operational configurations or represent them as tested, unrestricted, or universally fitted features.