Add-on dossier
Raspberry Pi, SAO, and Grove expansion surfaces
A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.
Back to add-ons index
assembly retrospective
The cluster's own 39C3 page ties the CDC Badge repository to the completed December 27-30, 2025 Hamburg assembly context.
Badge: 39C3 Critical Decentralization Cluster Badge
firmware status and safety documentation
The firmware README documents ESP-IDF/PlatformIO, FIDO2/WebAuthn, GPG/SSH, TOTP, password-vault, plugin, BLE, and data-loss/early-beta caveats.
Badge: 39C3 Critical Decentralization Cluster Badge
hardware and documentation repository
RIAT's public CDC Badge source tree with KiCad hardware, printable cases, documentation, fabrication instructions, expansion descriptions, and linked firmware projects.
Badge: 39C3 Critical Decentralization Cluster Badge
hardware license
Public CERN Open Hardware Licence v2 Permissive source for the RIAT CDC Badge project, with third-party component attribution retained separately by the repository.
Badge: 39C3 Critical Decentralization Cluster Badge
official 39C3 assembly event
Primary official Congress event page explicitly calling the artifact an electronic conference badge and devboard, and naming its TROPIC01, ESP32-S3, e-paper, LiPo, keypad, and expansion surface.
Badge: 39C3 Critical Decentralization Cluster Badge
official assembly page
Official 39C3 assembly page for the Critical Decentralization Cluster, which lists the CDC Badge presentation in its recorded assembly programme.
Badge: 39C3 Critical Decentralization Cluster Badge
post-event public firmware
Public GPL-3.0 firmware project for CDC Badge v1.0/v1.1 hardware. Its January-July 2026 public history is kept separate from an asserted 39C3 deployed image.
Badge: 39C3 Critical Decentralization Cluster Badge
power and firmware caution
Source-published checklist covering BQ25895 charge-current/power settings, USB interaction, and TROPIC01 sleep requirements; it is not proof of configuration on every event unit.
Badge: 39C3 Critical Decentralization Cluster Badge
versioned open-hardware release
Public v1.1 release evidence for the CDC Badge hardware tree. It does not identify which source revision, if any, was on a particular 39C3 physical unit.
Badge: 39C3 Critical Decentralization Cluster Badge
39C3 Hub / Chaos Communication Congress · retrieved 2026-05-15
Official assembly source that places the CDC Badge presentation in 39C3's cluster programme and describes the Critical Decentralization Cluster's event role.
Badge: 39C3 Critical Decentralization Cluster Badge
39C3 Hub / Chaos Communication Congress · retrieved 2026-05-15
Primary official Congress source identifying the CDC Badge as an electronic conference badge and devboard with TROPIC01, ESP32-S3, e-paper/frontlight, LiPo battery path, keypad, and expansion ports.
Badge: 39C3 Critical Decentralization Cluster Badge
Critical Decentralization Cluster · retrieved 2026-05-15
Cluster-owned retrospective for the completed 39C3 assembly, its dates and location, and its direct CDC Badge repository link.
Badge: 39C3 Critical Decentralization Cluster Badge
RIAT Institute / GitHub · retrieved 2026-05-15
Primary CERN-OHL-P-2.0 license source for the CDC Badge hardware project; it does not automatically license every unrelated event mark or media asset.
Badge: 39C3 Critical Decentralization Cluster Badge
RIAT Institute / GitHub · retrieved 2026-05-15
Versioned public v1.1 CDC Badge release. It is source-release evidence, not a confirmed physical 39C3-unit firmware or bill-of-materials mapping.
Badge: 39C3 Critical Decentralization Cluster Badge
RIAT Institute / GitHub · retrieved 2026-05-15
Primary configuration-caution source for BQ25895 charging/power settings, USB interaction, full power-off, and TROPIC01 sleep handling.
Badge: 39C3 Critical Decentralization Cluster Badge
RIAT Institute / GitHub · retrieved 2026-05-15
Primary open-hardware source for the ESP32-S3/TROPIC01 board, e-paper/keypad/expansion design, KiCad fabrication material, linked firmware, and project-level licensing.
Badge: 39C3 Critical Decentralization Cluster Badge
krim404 / GitHub · retrieved 2026-05-15
Primary public firmware-status source for the documented secure-element application surface and explicit early-beta/data-loss/security-critical-use warnings.
Badge: 39C3 Critical Decentralization Cluster Badge
krim404 / GitHub · retrieved 2026-05-15
Public post-event GPL-3.0 firmware source for CDC Badge v1.0/v1.1 hardware. Its later source availability is not treated as a 39C3 deployment ledger.
Badge: 39C3 Critical Decentralization Cluster Badge