Show HN: Open-Source eInk Bike Computer

(opentrailpaper.com)

41 points | by stingrae 51 minutes ago

9 comments

  • pilina 7 minutes ago
    Battery of my Cubot King Kong Mini is slowly dying. I use it with OpenTracks to record my commutes and use as bikecomputer and sometimes Osmand+ for offline navigation. I am searching for alternative, which needs to be waterproof and cheap (my commutes luckily includes downhill trails sometimes - I dont want to break expensive device). The title gave me high hopes, but I suppose I need to keep searching.
  • tuchsen 11 minutes ago
    Hey this looks neat, I’ve been thinking on trying something similar. I’ve not encountered the ANT protocol, what bike ya using? Is it a higher level thing that your display is giving you, or something your controller uses? I know Bafang uses CAN protocols in their newer e-bike systems and a lot of manufacturers (especially Chinese) use a proprietary UART protocol to stitch things together on the cheaper end.

    The mess of different implementations makes it really hard to hack on and share this kinda stuff.

    AI does make it really easy to figure out these protocols now so that’s nice I guess. I just flipped my bike upside down and hooked up a logic analyzer and it took LLM no time to figure it out… it is really impressive

  • dumbmachine 4 minutes ago
    Wow, this is really cool. I really needed something for my neo retro build, this might just fit the bill.
  • kccqzy 16 minutes ago
    Wow. You managed to receive ANT via BLE hardware?! I didn't know these two protocols were so similar.
    • stingrae 4 minutes ago
      yes. they luckily the same phy, 1 Mbit/s GFSK modulation.
  • maxrev17 3 minutes ago
    Insane! Quality on the ANT too!
  • dinan 13 minutes ago
    Does this work well in direct sunlight? I know a lot of e-paper panels struggle to refresh in strong sunlight. The waveshare panels look very faded if they update while exposed to UV.
    • stingrae 3 minutes ago
      i have ridden with this unit over five hundred miles and not had any issues. though SF Bay Area summers arent as tough as other places.
  • evrimoztamur 17 minutes ago
    I can't imagine using this in the Netherlands with random rain. The tradeoffs are hard to accept, wondering how it looks and performs in various weather conditions, and if a physical buttoned shell is worth it...
  • Lucasoato 9 minutes ago
    Any open source GPS locator for bikes?
  • arpanghoshal07 18 minutes ago
    great!