The board is designed in KiCad and uses a dual sided pcb while only using one side for the components. It features an ATtiny84 with 6 LEDs and a switch powered by a 3 V button cell. The example above was manufactured by [OSH Park].
The challenge is to come up with your own interesting light shows, games, etc. for the badge. This repo includes a basic Arduino sketch using the [ATTinyCore] to get you started.
Use some crocodile clips and an AVR ISP programmer like a standard Arduino UNO with the [ISP sketch] and a 10 μF capacitor.
The design and example firmware are licenced under `GPL-3.0-or-later`.