Series
Philadelphia-area hacker-conference lineage, starting here with the source-backed JawnCon 0x1 modem badge record, Hayes SmartModem styling, RetroWiFiModem firmware lineage, and small-conference in-house manufacturing notes, and continuing with the pre-event JawnCon 0x3 ATmega328P calculator kit badge documented on the official badge page.
Philadelphia-area hacker-conference lineage, starting here with the source-backed JawnCon 0x1 modem badge record, Hayes SmartModem styling, RetroWiFiModem firmware lineage, and small-conference in-house manufacturing notes, and continuing with the pre-event JawnCon 0x3 ATmega328P calculator kit badge documented on the official badge page.
Badges
Hayes SmartModem-inspired Wi-Fi modem badge
The JawnCon 0x1 modem badge was a wearable miniature Hayes SmartModem homage for the October 2024 Philadelphia-area hacker con. JawnCon's official write-up says it used RetroWiFiModem to simulate the AT command set and drive the LEDs, with a PCB carrying an ESP radio, level shifter, and vintage red LED front; Hackaday covered it as an ESP8266-powered Wi-Fi modem badge for early-Internet services.
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.