Issue dossier

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.

A linkable camp-impact record with badge context, severity, evidence confidence, and source notes.

H2HC 2018 Badge note

power and programming caveat · primary writeup · documented

The record documents practical handling and programming risks rather than presenting the badge as a frictionless reference design.

Evidence

Related Resources

project page

Security-Bits writeup documenting bottle-shaped ESP32 badge hardware, OLED, BLE behavior, LEDs, programming, power, and practical warnings.

Source trail

Security-Bits.de · retrieved 2026-05-15

Primary writeup source for ESP32 WROOM, OLED display, BLE behavior, LEDs, power, Arduino workflow, and programming warnings.