BSides Cleveland 2026 Cassette Badge
Discrete-logic cassette LED badge with attendee play and volunteer rewind variants
The BSides Cleveland 2026 conference badge, published by the organizers on October 6, 2026 as CC0 KiCad designs: a cassette-tape-shaped, all-SMD coin-cell board in two variants. A Schmitt-trigger oscillator clocks a 74HC4017 decade counter that steps rings of orange, green, and blue LEDs, so the attendee cassette appears to play and the volunteer cassette appears to rewind. The back artwork hides a Vigenère-and-ROT13 easter egg that decodes to Hack The Planet. The September 26 event is officially completed, but no source gives a badge count or describes the handoff.