# 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.

- Type: Case study
- Targets: Firmware
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/lifetreelee/earbud-led-display-map>
- Primary source: <https://github.com/lifetreelee/earbud-led-display-map/blob/dc77459917360d04a2137c8c0e371a5aa00617f6/README.md>
- Catalog page: <https://awesomerea.org/resources/earbud-led-display-map-case/>
- Record JSON: <https://awesomerea.org/resources/earbud-led-display-map-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/earbud-led-display-map-case/index.md)

## 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.

## Primary sources

1. <https://github.com/lifetreelee/earbud-led-display-map/blob/dc77459917360d04a2137c8c0e371a5aa00617f6/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.