An ESP32-based circadian-rhythm lighting system prototype designed to support hospital patient comfort by dynamically controlling brightness and color temperature throughout the day. Includes a simple web dashboard for real-time control over Wi-Fi.
- Adjusts warm/cool LED channels to simulate day-to-night lighting changes
- Lets users control lighting through a web UI (sliders/buttons) in real time
- Exposes lightweight endpoints (e.g., for mode, DAC/brightness, and time-based scheduling)
- Built to be easy to demo: connect → open dashboard → control lights
Hospital environments can disrupt sleep and circadian rhythms. CircadianLight explores a non-pharmacological approach: lighting that better matches natural day/night patterns, aiming to reduce factors that contribute to confusion and poor sleep.
- ESP32 (Wi-Fi control + hardware output)
- Web dashboard: HTML / CSS / JavaScript
- LittleFS (serves the dashboard files)
- Utilized Digital to Analog Converter (DAC) pins on ESP32 (for brightness + channel mixing)
- Powered by a 7V power supply
- Manual control: brightness + warm/cool balance
- Preset modes (example: Day / Evening / Night)
- Auotmatic/Manual time modes
- Download the circadian_rhythm_lightning folder and keep the file directory structure the same
- Open the
circadian_rhythm_lighting.inofile in Arduino IDE - Configure your Wi-Fi credentials (or the project’s config method) located near the top of the code
- Upload to your ESP32
- Open command/search bar in Arduino IDE (default shortcut is Ctrl + Shift + P for Windows/Linux and Cmd + Shift + P for Mac
- Search and click onto "Upload LittleFs to Pico/ESP8266/ESP32"
- Connect to the ESP32 on your network (should automatically be connected after sketch upload if ESP32 is plugged-in to your device)
- Open the ESP32’s IP address in your browser, or type in "http://circadian.local/" in your browser's search bar
- You can now control brightness / color temperature throguh the web UI