NorthSec 2023 Badge
AVR badge-chain interaction badge
NorthSec 2023's public badge trail combines the official badge repositories with a first-hand technical writeup documenting an ATmega328PB attendee badge with CH340C USB serial, six push buttons, 16 WS2812B RGB LEDs, optional 128x32 OLED, AVR ISP, SAO connector, side-chain headers, BLE mesh controller-screen challenge behavior, and point-scoring badge-to-badge interaction.