Open-Source eInk Bike Computer
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
What it does
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. After routes and maps are loaded, the head unit can record and navigate by itself. There is no account or subscription. The app is used when you want to prepare or…from opentrailpaper.com
Pricing, as stated on its site
Free — Open-source DIY e-paper bike computer firmware. No subscription or account required. Free to use with compatible hardware (LilyGO T5S3 board). Optional free iOS companion app available.
checked September 2026 · prices change
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