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

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 TrailBridge app (navigation + GPS position)
• 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

Navigation comes from TrailBridge, a companion Android app that reads OsmAnd's turn-by-turn instructions and forwards them to the bike computer over BLE using a documented TLV protocol (see TrailBridge's PROTOCOL.md). It replaces Komoot's now-discontinued BLE navigation service, which this project used originally.

TrailBridge also exposes the phone's raw GPS position over a second, independent BLE service (works even without OsmAnd running), which the bike computer logs to its binary datalog alongside its own sensors.

Limitations (for now):

• TRGB-Bikecomputer connects to the first TrailBridge instance it sees (its BLE address isn't persisted/locked, since Android peripherals use a rotating address).
• no manual change to nav screen yet (automatic change if new navigation instruction arrives or if distance is < 250m)

Licences and Attributions

Images

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