Gulaschprogrammiernacht 17 · Germany · 2017

GPN17 Badge

ESP8266 GulaschPushNotifier badge

An Entropia-produced Gulaschprogrammiernacht 17 badge built around ESP8266, a 128x128 LCD, 18650 power, sensors, WS2813 LEDs, IR, a ROM store, and Hack-the-Badge camp challenges.

GPN Gulaschprogrammiernacht Germany ESP8266 MicroPython ROM Store Hack-the-Badge Sensors IR Add-ons

EventGulaschprogrammiernacht 17

SeriesGulaschprogrammiernacht

LocationZKM and HfG, Karlsruhe

CountryGermany

People

Authors & Credits

HiFi-Bodge audio add-on author

helge

Listed as the Hackaday.io project author for the GPN17BadgeHiFi-Bodge add-on.

Source

badge design, production, and add-on author

Jana Marie Hemsing

Portfolio page lists GPN17 badge work and related add-on hardware.

Source

badge development talk speaker

Jan Henrik

Listed as a speaker for How we bodged the Badge.

Source

badge development talk speaker

Niklas

Listed as a speaker for How we bodged the Badge.

Source

Why It Mattered

GPN17 is a compact but unusually well-documented smaller-European-event badge: it combines event notification utility, an app/ROM lifecycle, hardware add-ons, contest play, and a frank public development talk.

Hardware

The official badge page documents ESP8266, 4 MB flash, 128x128 LCD, joystick, 18650 battery holder, WS2813 LEDs, vibration motor, CP2102 USB-serial programming, LDR light sensor, BNO055 IMU, MQ-3 alcohol sensor, IR transmitter/receiver, expansion connector, and KiCad/FreeCAD files.

Software & Apps

The badge ran Micropython with an official GulaschPushNotifier ROM, a ROM store, WiFi/HTTP APIs, MQTT and UDP behavior, WebUSB flashing notes, and documented paths for custom ROMs.

Lore

The name turns GPN into GulaschPushNotifier: the badge could push schedule-like event information while still inviting campers to write ROMs, win Hack-the-Badge points, and attach odd add-ons such as audio or thermal-camera boards.

Lifecycle

Add-ons & Upgrades

event challenge ecosystem historical

Hack-the-Badge challenges

The GPN17 challenge page collected badge-hacking tasks, scoring, and prize context for attendees during the event.

Compatibility: GPN17 Badge

Source

hardware audio add-on historical

HiFi-Bodge audio board

helge's HiFi-Bodge project extends the badge as an audio-capable hardware add-on.

Compatibility: GPN17 Badge

Source

mechanical add-ons historical

Case, D-pad, snubbel, and pinup accessories

The official badge page links 3D-printable mechanical accessories and CAD resources for carrying, controlling, and decorating the badge.

Compatibility: GPN17 Badge

Source

sensor add-on historical

AMG8834 thermal-camera board

The AMG8834 breakout turns the badge expansion interface into a small thermal-camera experiment.

Compatibility: GPN17 Badge

Source

software app ecosystem historical

ROM store and GulaschPushNotifier ROM

The badge page documents a ROM store and an official GulaschPushNotifier ROM, making app-like software swapping part of the GPN17 experience.

Compatibility: GPN17 Badge / MicroPython ROMs

Source

Operational history

Issues & Camp Impact

hardware caveats note

The official badge page preserves practical hardware warnings around optional 1 A charging, IR/USB pin sharing, MQ-3 power draw, and expansion use.

The page is a useful example of good badge documentation: it records what can be hacked and where users should be careful.

Confidence: primary docs
Status: documented caveat
Timeframe: during and after event
Source note: Entropia GPN17 badge page.

memory and ROM constraints note

The badge page documents a constrained ESP8266/MicroPython ROM model, including ROM-store use and warnings that some software needed to fit the badge's available flash and RAM reality.

GPN17 was hackable, but successful custom ROM work still required understanding the embedded limits instead of treating the badge like a general-purpose computer.

Confidence: primary docs
Status: documented caveat
Timeframe: during and after event
Source note: Entropia GPN17 badge page and GitHub repository.

missing rights-cleared image note

No local GPN17 badge image is published because the Entropia wiki file pages and GitHub tree expose useful badge imagery and firmware/UI assets, but no explicit reusable image license, permission basis, attribution requirements, and processing provenance were recovered for catalogue publication.

The record remains source-backed and image-free rather than copying Entropia wiki photos, screenshots, repository web assets, Hackaday.io media, or generated approximations.

Confidence: local project policy
Status: needs licensed original replacement
Timeframe: current catalogue build
Source note: badge.gallery image policy, Entropia GPN17 badge and file pages checked May 21, 2026, and GitHub API for `entropia/gpn17-badge` reporting `license: null`.

Resources

AMG8834 thermal add-on hardware add-on · Surviving project-list source for the AMG8834 thermal-camera breakout board for the GPN17 badge. GPN17 Hack-the-Badge challenge page · Camp challenge page for badge hacking, scoring, and prize ceremony links. GPN17 HiFi-Bodge hardware add-on · Hackaday.io audio add-on for the GPN17 badge. GPN17 badge GitHub source · Public hardware/software repository linked from the badge page. GPN17 badge wiki official wiki · Main badge page with hardware, software, CAD, ROM-store, API, and add-on details. GPN17 event page event page · Official event page with dates and Karlsruhe venue context. GPN17 media archive event media · media.ccc.de archive for GPN17 talks and badge-related sessions. How we bodged the Badge talk · Public talk about badge development and production. Jana Marie Hemsing project notes creator page · Portfolio notes for the GPN17 badge and hardware add-ons.

Sources

Entropia: GPN17 Retrieved 2026-05-15 · Primary event context for dates, location, and GPN17 framing. Entropia GPN17 wiki: Badge Retrieved 2026-05-15 · Primary source for hardware specs, software behavior, ROM store, API surface, CAD, and add-ons. Entropia GPN17 wiki: Hack the Badge Retrieved 2026-05-15 · Primary source for challenge and prize context. Entropia GitHub: gpn17-badge Retrieved 2026-05-15 · Public source repository for the badge. Hackaday.io: GPN17BadgeHiFi-Bodge Retrieved 2026-05-15 · Source for the HiFi-Bodge audio add-on. Jana Marie Hemsing: GPN17 badge Retrieved 2026-05-15 · Creator portfolio source for GPN17 badge and add-on design context. Jana Marie Hemsing: amg8834-GPN17badge Retrieved 2026-05-15 · Surviving public source for the AMG8834 thermal-camera add-on board. media.ccc.de: How we bodged the Badge Retrieved 2026-05-15 · Talk source for development-story and speaker credits.