Nuit du Hack 2014 Collector Badge
Assemble-and-hack Black Badge challenge
A limited collector badge and hardware-hacking challenge from Nuit du Hack 2014, with public challenge rules, writeups, and a Virtualabs repository.
Tag dossier
ATmega328P
Badge records tagged with ATmega328P, across China, France, Japan, Singapore, United States.
AVTOKYO 2015 Electrical Badge
Japanese ATmega328P LED attendee badge
AVTOKYO's official 2015 badge page says the conference made an electrical badge for attendees, with an AT-MEGA328P-PU, eight 5mm LEDs, two push buttons, 16 MHz crystal, resistors, capacitors, IC socket, coin-cell holder and battery, public KiCad PCB design, and public Arduino program.
DEFCON China 1.0 Badge
Flexible-PCB tree-game badge
A Grand Idea Studio badge for the first official international DEFCON edition, built as an artistic flexible-substrate PCB with 32 LEDs, USB connectivity, accelerometer input, role-color artwork variants, and a task-completion tree-lighting game.
Kernelcon 2020 Hack-Master Badge
ATmega328P dual-PCB image-reel badge
The Kernelcon 2020 Hack-Master badge was a dual-PCB electronic badge with an ATmega328P-AU, three-AAA power, nine APA102 RGB LEDs, a backlit custom image reel, serial-port game plans, EEPROM mode storage, and ICSP pogo-pin programming.
Off-By-One 2024 Hardware Badge
Singapore dual-screen Octopus badge
Off-By-One Conference 2024 used an Octopus-themed hardware badge with ESP32-S3 and ATmega328P controllers, dual 128x128 GC9A01 round LCDs, IR, WS2812 LEDs, buttons, a user-flashable MicroPython challenge surface, and six published challenge flags.
DC-34 Countdown to Singularity Badge
Public KiCad/Arduino DEF CON 34 project; production and distribution unverified
eggsactly's public `DC-34-Countdown-To-Singularity` repository explicitly calls itself KiCad 6 design files for a DEF CON badge that lets users display an estimate for when the AI singularity will occur. Its README names eight seven-segment displays, a real-time clock, front buttons for changing the estimate, a KiCad board tree, an Arduino firmware tree, and a BOM that includes an ATmega328P-PU, PCF8523T, seven 2×3 SAO connectors, three buttons, 9 V input/battery parts, and display/power components. This is a real, independently documented pre-event source project, not proof of an assembled run, a specific final unit, DEF CON authorization, allocation, sale, delivery, credential function, or a rights-cleared image.
JawnCon 0x3 Calculator Badge
ATmega328P calculator kit badge with DTMF tones, hidden games, a badge-to-badge link, and an in-event firmware fix
The JawnCon 0x3 badge, documented on JawnCon's official badge page ahead of the October 16-18, 2026 conference at Arcadia University. The JawnCon0x3 Badge is a four-digit, seven-segment calculator kit built around an ATmega328P-P with a 16-key keypad. Every key plays a touch-tone (DTMF) pair, typed codes unlock hidden games, a USB-serial menu renames the badge and shows high scores, and a wired serial link lets two badges introduce themselves and count links. A 20-pin edge connector lets attendees plug in their own hardware. The page has attendees assemble the kit at the JawnCon soldering station. During the conference the official homepage said this year's badge had sold out and published a fixed firmware image, with a reprogrammer in the Chillout space. Kit counts and how many attendees received one are not published.