Show HN: Open-Source eInk Bike Computer
OpenTrailPaper is an open-source firmware for the LilyGO T5S3 4.7 E-Paper PRO that displays ride data, offline maps, and follows GPX routes. The device records FIT files and connects to Bluetooth sensors. Users interact with the orange touch target on the board to navigate between screens. The iOS companion app assists in planning, transferring routes, building offline maps, copying recorded rides, adjusting settings, and installing firmware updates via Bluetooth.
Remarkably, the head unit operates independently of the phone during rides. Once routes and maps are loaded, the head unit can record and navigate autonomously. Notably, OpenTrailPaper does not require an account or subscription, as the app is utilized for preparation and data transfer. The project is still in development and not a finished, weatherproof retail product.
During setup, the head unit flashes the board over USB, enabling the creation of basic offline maps. The process necessitates a desktop Chromium browser, while the iOS app generates maps incorporating elevation data. OpenTrailPaper is supported by various organizations.
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