This project is to create a fully open sourced cycling computer based on micro-controller hardwares such as ESP32 and Pi Pico.
This project is still a working progress and are at a very early stage so please forgive me for the current state.
| Oled debug | Oled Normal | T-Display | T-Watch |
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Similar project exist on ARM-Linux platforms but I want something that can be run on very miniature hardware while still maintain good battery life.
One of the goal for this project is to create a software platform to make it easier to make your own cycling computer with your choices of hardware and interface.
If you have a project with specific hardware and sensor in mind, feel free to try this out or open an issue so I can help as well.
You will need an Arduino or MicroPython compatible micro-controller such as one based on the ESP-32 module or the Pi-Pico module, with one of the following display module:\
- SSD1306
- ST7789
Currently, the following hardware are tested with MicroPython :
- ESP32 with SSD1306 OLED display on I2C.
- TTGO T-Display (ESP32 with ST7789 LCD).
And the following are being tested with Arduino/C++ :
- TTGO T-Watch 2019 with touch (and GPS module)
- TTGO T-Watch 2020 v2
- Theoretically, all other T-Watch models should be at lease partially supported.
You will also need a speed/Cadence sensor for your bike. This can be home made or off-the-shelf as long as it follows the Bluetooth SIG's Cycling Speed and Cadence GATT profile.
I uses a XOSS speed/Cadence sensor just because its the cheapest I can find.
If you want make OpenCycle to support new hardwares, feel free to contribute :)
Or you can open an issue with the new hardware label.
- BLE communication with the speed/cadence sensor
- Displaying basic information (Speed, distance, etc.) for:
- SSD1306
- ST7789
- Modular setup for custom screen
Using your preferred method copy all .py file, the oled_font folder and font5x8.bin to your micro-controller.
Make sure your speed/Cadence sensor is awake and has a service UUID 0x1816 (This should be the case for most sensor)
In open_cycle.py uncomment the screen you would like to use:
# Choose your display here =====================
# oled_diplay = DebugOled(5, 4)
# oled_diplay = OCOled(5, 4)
# oled_diplay = DebugTdisp()
# oled_diplay = ColorTdisp()
# ==============================================DebugOled and OCOled works with thE SSD1306 display, DebugTdisp and ColorTdisp works with the T-Display (ST7789)
Run open_cycle.run_openCycle()
Make a sub-class of either OledDisplay or TDisplay and implement the following method:
show_msg(self, title, msg0="", msg1="", msg2="")
show_csc(self, speed, distance, rpm, raw)My current focus is on exploring the capability of the TTGO T-Watches. Due to the manufacture library support, I am redoing everything in Arduino/C++.
If you are interested, give it a try (look under cpp/test). Make sure you have ESP32 arduino core 1.0.6 and TTGO TWatch Library installed.
Finishing the first working version of display for T-Watch. Checkout under /cpp
Adding support for the TTGO T-Display as its a very nice piece of hardware.
- Modifying the st7789my to enable text scaling and draw circle
- Enable asynchronous display update. Due to the slow nature of ST7789, i change the display to no longer in sync with the bluetooth call back. This allows many nice thing like update speed more often than others and much faster connections speed
- Adding new colour screen with run time and battery voltage
Modularize display implementation. Also added new nicer screen with larger speed font.
Thanks for the nicer OLED font library from MicroPython Chinese community
Add speed and distance calculation
Finally getting data from the speed/Cadence sensor