# Open-Source eInk Bike Computer

Project, Worldwide.

> Open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO, with offline maps, GPX routes, FIT recording and Bluetooth sensors.
>
> — in its own words, from opentrailpaper.com, read 2026-09-04

- Website: https://opentrailpaper.com
- Listed since: 2026
- launched: 2026-09-04
- launch post: https://news.ycombinator.com/item?id=49567437
- hn score: 29
- domain created: 2026-07-20
- Last verified: 2026-09-04


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=49567437, read 2026-09-04

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startup.is · https://startup.is/projects/open-source-eink-bike-computer · open data: /api/v1, /llms.txt