This is the firmware and pcb for brucon badge
as of released at the conference ie. including :
- the mistake that needs a bodge (vbat to the sensor, backlights and leds missing a bit of trace) and
- the mistake with the connector (don't use the one refed in the kicad docs, it is keyed down instead of up)
-my (ugly) firmware code and the PCB are CERN-OHL-P
-the gasmask art is CC/NA by Ray Harvey
-Espressif stuff : see here