Security-Bits.de
Publisher of the H2HC 2018 badge hardware and programming writeup.
SourceH2HC 2018 · Brazil · 2018
H2HC 2018 Badge
Bottle-shaped ESP32 BLE and OLED badge
A small-batch H2HC 2018 bottle-shaped PCB badge with an ESP32 WROOM, I2C OLED display, six controllable LEDs, BLE behavior, AAA or USB power, and Arduino IDE source-code notes.
EventH2HC 2018
SeriesHackers to Hackers Conference
LocationSao Paulo
CountryBrazil
People
Authors & Credits
Why It Mattered
It documents Brazil's H2HC badge lineage moving from ARM development boards into interactive ESP32 art-PCB badges with display, BLE, and attendee-visible power and programming constraints.
Hardware
The source writeup describes a bottle-shaped PCB with ENIG gold contacts, ESP32 WROOM controller, 0.96 inch I2C OLED display, 3 AAA battery power or USB power, six controllable LEDs, and an FTDI-style serial programming workflow.
Software & Apps
The code was written in the Arduino IDE using ESP32 support and SSD1306 OLED libraries. The writeup describes BLE write handling, LED switching, text messages on display pages, a dynamic Android BLE app path, and multiple display tabs for status, debug, and name pages.
Lore
The writeup records practical badge-build details attendees noticed, including swapped OLED VCC/GND pins on final displays, BLE battery drain, and explicit warnings against 12 V USB-to-serial cables.
Lifecycle
Add-ons & Upgrades
firmware feature
source-backed
BLE message and LED control
The writeup describes BLE write handling that switches LEDs and shows text messages across badge display pages.
Source
interface feature
source-backed
OLED display pages
Documented display tabs include main H2HC 2018, dev status, last BLE message, raw debug text, and name pages.
SourceOperational history
Issues & Camp Impact
missing rights-cleared image
note
No local H2HC 2018 badge photo has been added because image reuse rights for the public writeup photos have not been cleared.
The catalogue does not copy the writeup photos until image provenance can be represented properly.
- Confidence
- local project policy
- Status
- needs licensed original replacement
- Timeframe
- current catalogue build
- Source note
- badge.gallery image policy and Security-Bits source page.
power and programming caveat
note
The writeup notes BLE battery drain, swapped VCC/GND pins on final OLED displays, and a warning that 12 V serial adapters can fry the badge.
The record documents practical handling and programming risks rather than presenting the badge as a frictionless reference design.
- Confidence
- primary writeup
- Status
- documented
- Timeframe
- H2HC 2018 badge use
- Source note
- Security-Bits H2HC 2018 badge writeup.