SugarSentry

ESP32-based ambient blood glucose visualisation device with e-ink display. Inspired by gagebenne/pydexcom and lmarzen/esp32-weather-epd.

❗ Project Status: Development in Progress

• ✅ Core Dexcom API communication (authentication, fetching readings).
• ❌ E-ink display integration.
• ❌ Sensor (Temp/Humidity/Proximity) integration.
• ❌ Graphing functionality.
• ❌ LED feedback logic.
• ❌ Power optimization implementation.

Description

SugarSentry aims to be a stylish, bedside/desktop device that displays blood sugar levels from the Dexcom API, shows historical data in a graph, and also monitors room temperature and humidity. The device uses an e-ink display for low power consumption and extended battery life. For nighttime use, it features a proximity-activated RGB LED that dimly indicates the current blood sugar level.

Key Features

(Note: Most features are planned and not yet implemented; see Project Status above for details)

• 🔄 Displays real-time blood glucose levels from Dexcom API
• 🔄 Shows historical glucose data in graph form
• 🔄 Monitors room temperature and humidity (BME280 sensor)
• 🔄 Detects proximity (VCNL4040 sensor)
• 🔄 Highly power-efficient with e-ink display
• 🔄 Battery-powered with recharging circuits for flexibility
• 🔄 Proximity-activated RGB LED for nighttime glucose level indication

Hardware

• Adafruit HUZZAH32 – ESP32 Feather Board
• 7.5-inch (800x480) E-Paper Display
• BME280 temperature/humidity sensor
• VCNL4040 proximity and ambient light sensor
• RGB LED
• LiPo battery

Development

• Written in C++
• Compatible with Arduino IDE and PlatformIO
• Core networking and API logic established
• Focus on modularity, testability, power efficiency, and memory optimisation

License

This project is licensed under the MIT license.

Acknowledgements

This project was inspired by:

• gagebenne/pydexcom
• lmarzen/esp32-weather-epd