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T-RGB Bike Computer

A bike computer based on LilyGO T-RGB:

  • 480px round RGB TouchDisplay
  • ESP32-S3 microcontroller with Bluetooth LE and WiFi
  • SD Card
  • Battery connector incl. charging logic

Photo of T-RGB Bike Computer with active navigation

Build

Compile and upload with platformio.

Roadmap

Prio 0 Features - work in progress or already working

BLE Devices

  • Connect to CSC Cadence
  • Connect to heart rate
  • Connect to komoot App
  • connect to CSC speed
  • connect to Forumslader Classic via my BLE gateway

Logging

  • Write debug information to logfiles
  • Write raw forumslader data to logfiles
  • Replay FL log file
  • User Interface for replay
  • Write summary in binary logfile
  • Python Scripts to convert binary logfile to CSV and to LineProtocol (influxdb)

Console

  • Integrate SimpleCLI
  • Set loglevel by console and store them
  • Configure WiFi from console
  • basic debug/monitoring support (free heap etc.)

Webserver

  • Connect to WiFi
  • Give static overview and server logfiles
  • Delete/Cleanup logfiles (integrated, but does not work yet)
  • WIP: Charts on Webserver
  • Debug Information on Webserver

User interface

  • Initialize RGB display
  • Merge and refactor existing UI from my T-RGB Experiments (speed, FL batterie, heart rate, FL details, IP Adress)
  • Add Navigation Screen
  • WIP: Implement all navigation items (roundabouts are still missing, all others ok)
  • WIP: Show basic statistics
  • Add very simple screen (in bright theme for better readability in direct sunlight)
  • Add screen for more detailed information
  • Show connection information on screeen

Case

  • Create case model for 3D-printer (done for standard handlebar incl. space for 2 USB-A sockets ("Forumslader variant")
  • Create mount for trekking handle bar
  • Create mount for Canyon double decker bar

Prio 1 Features -- Help wanted

  • robust webserver for data download
  • Improve statistics (e.g. graphs )
  • better User Interface
  • Animations on display (e.g driving state, heart rate)
  • Configuration via Webserver (wheel diameter etc.)
  • Configuration via Display (wheel diameter etc.)
  • manage BLE devices via Webserver (show connection state, batterie level, delete connection)
  • improve handling of CSC devices: "Lock" connected devices and only allow adding new devices on demand. Also check if max 1 speed and max 1 cadence is connected
  • read battery state of BLE devices (works fine, but no UI yet)
  • manage BLE devices and show info via webserver
  • add additional sensors (barometer/temperature, gyro/inertial)
  • use gyro/inertial sensor data
  • improve 3D-printable mounts

Prio 2 Features -- Help NEEDED (I don't have the time for them)

  • AP Mode for Wifi for first setup (simple AP mode for download may be prio 1)
  • even better User Interface
  • add better 3D-printable mounts, also for other handlebars
  • even better use of gyro/inertial sensor data

Howto

.. documentation work in progress ..

Use Navigation

If you use the komoot App on your mobile and start following a route (load preplanned trip or use the route planner, it will start advertising a simple navigation service. The TRGB-Bikecomputer will connect to the mobile and read navigation instruction. These are shown on display.

Limitations (for now):

  • TRGB-Bikecomputer will connect to the first komoot App it sees
  • font supports standard ASCII only (no "Umlauts").
  • no manual change to nav screen yet (automatic change if new navigation instruction arrives or if distance is < 250m)

Limitations (of komoot):

  • komoot is not a good navigation system.
  • It is great for planning routes, but it does not provide information about the turn after the next one and street names are often incomplete or misleading.
  • If you are off your route, komoot often asks to confirm new route on mobile even if route recalculation is switched on.
  • You must stop and store the route to finish navigation, otherwise your mobile keeps sending navigation instructions.
  • Even worse, in this case komoot often seems to freeze navigation information on old state
  • Even worse, a combination of the mentioned problems above often occur if you start a round-trip tour and komoot thinks you are already on your way back: Route is not updated or only to the short distance to destination, it takes a long time to restart and bluetooth navigation still shows old data.
  • The instructions to connect device to komoot may be misleading. You don't need to manually connect, but you need to activate routing support and then load a route. (To see if komoot advertise its navigation service, use another mobile with a BLE scanner).

Licences and Attributions

Images

Cycling icons created by Futuer - Flaticon Parked bicycles - Icon von Prashanth Rapolu 15