Hi everyone, I’ve been exploring ways to enhance my home’s lighting system using OpenHAB, and I’d love to share my journey and some tips with you. My goal was to create an adaptive lighting system that adjusts color temperature and brightness based on the time of day, mimicking natural light patterns. This concept is inspired by the Circadian Lighting component from Home Assistant, and I wanted to replicate it in OpenHAB for better customization and integration with my existing setup.### Setup and Configuration1. Items Definition: I started by defining items to store the calculated values for color temperature and brightness. This involved creating number items for Kelvin values and brightness levels, as well as scripts to handle the transformations. 2. Astro Items: To track sunrise and sunset times, I utilized the Astro binding. This provided the necessary timestamps to calculate the time of day and adjust the lighting accordingly.3. Rule Creation: I set up a rule that triggers every 5 minutes to recalculate the lighting values. This ensures smooth transitions throughout the day without manual intervention.4. Script Development: The core of the system is a JavaScript script that calculates the desired color temperature and brightness. The script uses a parabolic curve based on the time of day, with adjustments for sunrise, sunset, solar noon, and solar midnight.### Challenges and Solutions- Color Temperature Conversion: One of the challenges was accurately converting Kelvin values to RGB for LED strips. I referenced Home Assistant’s color utilities and adjusted the formulas to better match my LED strips’ performance. - Device Compatibility: Not all lights support simultaneous color and brightness adjustments without turning on. For Hue bulbs, I added checks to ensure the lights are on before making changes. For Tasmota-controlled devices, the adjustments work seamlessly without needing to turn the lights on.### Implementation and ResultsAfter setting up the system, I noticed a significant improvement in the ambiance of my home. The lights now transition smoothly from cooler tones in the morning to warmer tones in the evening, enhancing comfort and reducing eye strain. The adaptive brightness ensures optimal lighting levels throughout the day, automatically dimming during twilight and brightening as needed.### Tips for Others- Start Small: Begin by integrating one room or area to test the system before expanding.- Calibrate Sensors: Ensure your sunrise and sunset times are accurate by adjusting the latitude and longitude settings in the Astro binding.- Test RGB Conversions: Experiment with different conversion formulas to find the best match for your lighting setup.### ConclusionThis project has been a rewarding experience, combining automation with personal comfort. I’m excited to see how others might improve upon this concept or adapt it to their unique setups. If you have any questions or suggestions, feel free to reach out—I’d love to hear from you!Cheers, [Your Name]