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Friday, 4 September 2026 Reading Room

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Show HN: Open-Source eInk Bike Computer

Hey all, i just launched my Eink Bike computer project and think it is cool. Another tidbit, in the crazy things that AI has done... It has helped create a ANT (common sensor wireless protocol used in workout/biking) implementation for ESP32 by messing around with undocumented registers: https://github.com/RaemondBW/esp32-ant Comments URL: https://news.ycombinator.com/item?id=49567437 Points: 215…

opentrailpaper.com ·

OpenTrailPaper is an open-source firmware designed for the LilyGo T5S3 4.7 E-Paper PRO, which displays ride data, offline maps, and connects to Bluetooth sensors. The device can follow GPX routes, record FIT files, and be controlled via an orange touch target. An iOS companion app enables route planning, transfer, map building, settings adjustment, and firmware updates through Bluetooth.

The head unit operates independently during rides without requiring the phone. Once routes and maps are loaded, the device can record and navigate autonomously without an account or subscription. The open-source project is currently focused on the LilyGo board and is still in development, not a finished or weatherproof retail product.

The setup page flashes the board over USB for basic offline map creation, requiring a desktop Chromium browser, while the iOS app generates maps with elevation data. OpenTrailPaper acknowledges support from various organizations.

Written by urgent.news from Hacker News Best's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.

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