Show HN: Open-Source eInk Bike Computer
OpenTrailPaper is an open-source firmware project for the LilyGO T5S3 e-ink board, designed to function as a bike computer. It supports offline maps, GPX route navigation, and Bluetooth sensor connectivity without requiring a constant phone connection or subscription.
Why it matters
It represents the growing trend of DIY, privacy-focused hardware development in the cycling and outdoor technology community.
OpenTrailPaper is firmware for the LilyGO T5S3 4.7" E-Paper PRO. It shows ride data and offline maps, follows GPX routes, records FIT files and connects to Bluetooth sensors. You buy and protect the board yourself.
Each item shows the screen it describes. Use the orange touch target on the device to move between related screens.
The iOS companion can plan and transfer routes, build offline maps, copy recorded rides, change settings and install firmware updates over Bluetooth. The head unit does not need the phone during a ride.
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