GPS Bicycle Computer w/ ESP32, Speedometer, SD Logging

thingiverse

This is an ESP32 (Arduino) Based Bicycle Computer with GPS and SD logging. It's still a work in progress, but it's mostly functional so far. The code and mechanical aspects of the project definitely work well enough for daily usage scenarios. However, documentation isn't available yet, so I'd recommend starting this project only if you already have a decent understanding of electronics. See the code for pin definitions and refer to the schematic in the pcb folder on GitHub. Here's a quick overview: - GPS Speedometer and other data such as altitude, travelled distance, and time - 128x64 LCD - RTC DS3231 - Temperature and Humidity Sensor HTU21D - LDR for backlight adjustment - Micro SD for logging your trips - Charging over Qi Wireless charging - One user-button - 2x 14500 LiFePO4 Battery Print the necessary files and build the circuit. For prototyping, I recommend using a small breakout-board for the ESP32: https://www.aliexpress.com/item/32972157302.html. This is the LCD I used: https://www.aliexpress.com/item/32956038705.html. LiFePO4 Protection Board: https://www.ebay.de/itm/12A-1S-3-2V-LiFePO4-Lithium-Iron-Phosphate-Battery-Input-Ouput-Protection-Board/263309495883. Push Button Power Switch Board: https://www.ebay.de/itm/6A-Flip-Flop-Latch-Switch-Module-Bistable-Self-locking-Trigger-Board-LED-Motor/282381541189. Qi Receiver Pad: https://www.aliexpress.com/item/32933478038.html. GPS: https://www.aliexpress.com/item/1872389528.html. Please note that the PCBs are still work in progress and contain errors. See GitHub for the Code and other information: https://github.com/wilhelmzeuschner/esp32_gps_bicycle_computer