Add-on dossier

Expansion-header serial modem and radio chat

A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.

Hackaday Belgrade 2018 Badge historical

hardware/software add-on

Post-event hacks used the expansion-header serial pins with a NodeMCU to create a WiFi/BBS modem and badge radio chat path.

Badge: Hackaday Belgrade 2018 Badge
Type: hardware/software add-on
Status: historical
Compatibility: Hackaday Belgrade 2018 Badge
Source: https://hackaday.io/project/158741-hackaday-belgrade-badge-radio-chat

Badge context

Related Resources

article

Hackaday coverage of post-distribution badge hacks, demoscene entries, BBS modem work, and multiplayer serial games.

project page

NodeMCU-based serial radio chat and BBS modem badge hack.

project page

Primary project page with hardware, firmware, BASIC, CP/M/Z80, expansion, credits, and license context.

source

Firmware repository for the BASIC badge line.

Source trail

Hackaday · retrieved 2026-05-15

Secondary source for demoscene, modem, multiplayer-game, and firmware-lore examples.

Hackaday.io · retrieved 2026-05-15

Primary source for hardware specs, firmware behavior, license, credits, and project goals.

Hackaday.io · retrieved 2026-05-15

Source for ESP8266/NodeMCU serial radio chat and BBS modem hack.