Add-on dossier
A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.
Snap-on bumper for the triangular standard badge with six retention clips, USB-C and antenna clearances, and standard and comfort fit variants.
Badge context
Snap-on protective bumper for the triangular standard badge, published November 4, 2026, with standard and comfort fit variants and print settings. No license is stated.
EasyEDA Pro project export and schematic PDF, published November 8, 2026 with no license, covering the standard, supporter, supporter keyboard, and DIY kit badges.
The organization's November 8, 2026 fork of OffbandMesh/meshcore-firmware (MIT). On November 13 it had no commits of its own and sat 39 commits behind upstream.
November 10, 2026 patch release on MeshCore 1.17.0 with QCC_Badge companion and diagnostic UF2 and ZIP images; it fixes LED and display control reporting that was reproduced on a QCC badge.
Offband user guide for the badge: fitted-part differences, pairing, button and keyboard navigation, screens, default channels, radio defaults, tones, and GPS modes.
Arduino sketch for the supporter badge keyboard, modified from M5Stack's CardKB code, published November 12, 2026 with no license.
Official site for the November 13-15, 2026 Cincinnati conference at 151 West Fifth Street, with the Cleopatra's Cipher theme, agenda, hotel booking, and a link to the organization's GitHub.
Organizer GitHub organization linked from the official site. It holds the 0x4 badge schematics, keyboard firmware, firmware fork, and case, plus 0x3 badge code and a 0x2 badge backing.
Six-page schematic titled QCC 0x4 Badges, REV 1.0, drawn by abend, with standard badge microcontroller, power and charging, and peripherals pages plus keyboard, supporter, and DIY pages.
MIT-licensed MeshCore fork whose qcc_badge variant runs the badge as a BLE companion radio and whose releases carry QCC Badge UF2 and DFU images.
Source trail
Primary event source. It gives the November 13-15, 2026 dates, the 151 West Fifth Street, Cincinnati address, the Cleopatra's Cipher theme, Cannon Fodder Security as organizer, and a link to the QueenCityCon GitHub organization. The rendered page does not describe the badge; the agenda and registration are embedded from Whova and were not reviewed.
QCC_Badge companion and diagnostic UF2 and ZIP assets appear in offband-v1.5.0-beta7 (September 28, 2026), offband-v1.6.0-beta1 (October 22), offband-v1.7.0 (November 8), and offband-v1.7.1 (November 10). Release notes do not say which build, if any, was flashed on conference badges.
Third-party firmware design document dated September 12, 2026. It describes the badge as a ProMicro nRF52840 with an Ra-01SH, a 128x64 OLED, a CardKB-compatible keyboard, a buzzer, an LED, and an optional GPS port, lists the pin map, and says the stock firmware is Meshtastic 2.7.15 from the nrf52_promicro_diy_tcxo target. It is not an organizer document.
Offband user guide and October 5, 2026 radio note. They document the pyramid and supporter badges, the QCC- device names, the #queencitycon channel, the 919.5 MHz, 500 kHz, SF7 first-boot default chosen for FCC Part 15.247 in the 902-928 MHz band, and that fresh and already-configured badges may sit on different frequencies. The radio note is at https://github.com/OffbandMesh/meshcore-firmware/blob/firmware-base/docs/architecture/2026-10-05-qcc-badge-radio-parameters.md.
Organizer repositories created November 12 and November 4, 2026. The keyboard README credits M5Stack's CardKB code as the base and describes ICSP or serial-header flashing; the case README calls the standard badge the base-tier electronic conference badge and describes its triangular outline, rear battery, antenna connector, and optional LCD header.
Organizer repository created November 8, 2026. The README says the badges were designed in EasyEDA Pro and that the export and PDF cover the standard, supporter, supporter keyboard, and DIY kit badges. The PDF (six pages, REV 1.0, drawn by abend) shows the nRF52840-QIAA-R standard board with BQ24075 charging, XC6220 regulator, Ra-01SH, SSD1306 OLED, GPS, keyboard, buzzer, and LEDs, and ProMicro-based supporter and DIY boards with SAOv2, MUTE, and spare GPIO pads. It proves the design, not the quantities built or handed out.