Add-on dossier
A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.
The badge implemented a Minecraft Java Edition 1.21.4 server on the ESP32-C3, with in-world levers mapped back to the 24 physical RGB LEDs.
Badge context
Sinclair Studios writeup documenting the ESP32-C3/OLED badge, custom PCB, RGB LED strips, USB-C power, challenge stages, Minecraft stage, and build lore.
Designer profile linked from the badge challenge writeup.
Jeremy Stott's post-event technical writeup documenting the ESP32-C3 platform, 24 WS2812 LEDs, SSD1306 OLED, bare-metal Rust/Embassy architecture, stack-based pattern VM, USB Serial JTAG shell, WebSocket implementation, and Minecraft 1.21.4 server.
Official event page for the Christchurch Hacker Conference dates, The Majestic venue, and Christchurch, New Zealand location.
Source trail
Primary event source for CHCon 2025 dates, venue, and Christchurch location.
Primary designer source for ESP32-C3 hardware details, WS2812/OLED/JTAG components, no_std Rust firmware, Embassy async tasks, pattern VM, 15 LED modes, WebSockets, and the Minecraft 1.21.4 server implementation.
Primary technical writeup for the ESP32-C3/OLED badge hardware, RGB LED strips, USB-C power, challenge interaction, Minecraft stage, and Jeremy Stott designer credit.