Open Bike Computer RTOS

Summary

This repo is an open source bike computer based on freeRTOS on ESP8266 ESP32. (ESP32 is much newer hardware, no reason to stick with esp8266 right now) This is an attempt of learning C and freeRTOS env. I've first made bike computer using arduino nano, so this might be refered as version 2. I've also tackled a little of 3d design in blender to create a case for this bike computer.

Creating community around this project for all programmers riding their bikes would be awesome :)

Features

Core:

• current speed, distance, time
• average, max speed, total distance

Memory:

• average/max speed and total distance are stored on the device (not synchronized for now, only local)

Display:

• shows main and detailed ride data
• bottom half of the screen changes automaticly (8s 'big' distance, 3s details)

Synchronization using WiFi:

• synchronize ride data with OBC Server (see https://github.com/Random90/OBC_Server)
• wifi settings are hardcoded at compile-time
• data is sent the the obc_server on ride stop as a new ride after 30 seconds of inactivity (configurable at compile-time)
• ride is restarted automaticly after ride synchonization succeded
• sntp time synchronization - sets timestamp for your rides

Current supported hardware:

• ESP32
• Reed Switch
• pcd8544 Nokia 5110 LCD

3D Printable case

See /3dcase folder for files. Print both "obc_case_bottom" and obc_case_top" .stl files.

Additional funcionality TODOS and ideas:

• better sleep mode for battery performance
• local ride storage for later sync (on new ride started by button press) (spiffs)
• full ride logs with file rotation
• wifi access point setup, multiple WIFI access point settings
• timezone settings for time display
• modularization of components (start with screen selection at compile-time)
• different hardware support e.g different type of screens like OLED, E-ink, color LCD
• buttons
• automatic screen brightness
• live, reed impulse online sync (share your ride data realtime)
• sync with Strava API, Wifi geolocation.
• Even later in future: GPS module, GPRS module for live tracking.

Hardware

Prototype version

Pritable case for version with no soldering required, everything connected with Dupont cables. Uses ESP devkit with pins, nokia 5110 screen with pins soldered. Powered up by micro usb cable.

Required components

• ESP_WROOM_32 DEVKIT V1
• Nokia 5110 LCD HXE
• Reed switch

Default wiring

OBC uses VSPI (can be HSPI, but I use it for debug) to connect to LCD:

ESP32	LCD
D4	RST
D5	CE
D25	DC
D19	DIN
D18	CLK
3V3/5V	VIN
RX2/G16	BL
GND	GND

ReedSwitch -> ESP D21 PIN -> GND

JTAG CJMCU-2232HL (note to myself)

ESP32	JTAG
D13	AD0
D12	AD1
D15	AD2
D14	AD3
GND	GND

Micro fork version with battery

Work in progress!

Standard version

Soon

Standard version with battery

Soon+