Case study

Earbud-case LED display: a probed pinout and segment map

The earbud-case LED display study reconstructs the pinout and electrical drive map of an unmarked charging-case display. It documents 31 segments on eight charlieplexed lines, including ribbon-finger wiring and anode/cathode combinations, and supplies an ESP32-C3 driver and serial probing sketch.

Targets: Firmware
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 0
Last commit: 2026-10-27
Language: C++
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: The documented driver uses an ESP32-C3, GPIO wiring and a 1 kΩ series resistor on each line.
Limits: The upper and lower hundreds-stub segments, separate outline edges, current and exact scan rate remain unresolved.
License: MIT license.

Cite

BibTeX

@misc{earbud-led-display-map-case,
  title = {{Earbud-case LED display: a probed pinout and segment map}},
  howpublished = {\url{https://github.com/lifetreelee/earbud-led-display-map}},
  url = {https://github.com/lifetreelee/earbud-led-display-map},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/earbud-led-display-map-case/}}
}

Plain text

Earbud-case LED display: a probed pinout and segment map. https://github.com/lifetreelee/earbud-led-display-map (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/earbud-led-display-map-case/

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About this entry

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Primary sources

README.md GitHub · lifetreelee/earbud-led-display-map · Revision dc77459