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Show HN: Open-Source eInk Bike Computer (opentrailpaper.com)

419 points by stingrae · 38 days ago · 132 comments on HN

Article summary

The OpenTrailPaper is a DIY e-paper bike computer that runs on the LilyGO T5S3 4.7" E-Paper PRO board, providing features such as GPS tracking, offline maps, and Bluetooth connectivity to sensors. The device has tradeoffs, including no pressure sensor, basic GPS, and weak hardware buttons. It can be controlled using an optional iPhone app for setup and file transfer. The project is open-source and invites suggestions and contributions for improvement.

Main themes

  • e-ink display technology
  • bike computer design
  • ANT+ protocol
  • open-source development
  • GPS tracking and navigation
  • user experience and feedback
  • display technology comparison
  • outdoor device durability

What commenters say

  • Some users appreciate the benefits of a separate bike computer device, such as preserving phone battery and avoiding potential damage.
  • The use of e-ink display technology is debated, with some arguing it is ideal for outdoor use due to its visibility in sunlight, while others point out its limitations in terms of contrast and refresh rate.
  • ANT+ protocol is discussed as being phased out due to EU regulations requiring encryption, with some users noting the ecosystem's large installed base but lack of future support.
  • The choice between e-ink and LCD displays for bike computers depends on various factors, including visibility in different lighting conditions and personal preference.
  • Some commenters share their own experiences with bike computers and tracking devices, highlighting the importance of factors such as waterproofing and ease of use.
  • The project's open-source nature and potential for community contributions are seen as positives, with some users offering suggestions for improvement and sharing their own related projects.
  • The suitability of e-ink displays for bike computers is questioned, with some arguing that they are not ideal for high-contrast environments and may struggle with refresh rates.
  • The importance of considering real-world environmental factors, such as sunlight and weather conditions, when evaluating display technologies for bike computers is emphasized.