I’ve been diving into the world of smart home heating with OpenHAB and Sonoff devices, and it’s been an exciting journey! Here’s a quick rundown of my setup and some lessons learned along the way. 
My Setup:
I’m using the Heating Boilerplate template as a foundation for my heating system. It’s been fantastic for setting up target temperatures and automating my Sonoff devices with thermal actuators. My goal is to create multiple heating zones, each with its own temperature schedule and sensors. For example, my office and living room each have their own zones, complete with temperature sensors and radiators controlled by Sonoff devices.
The Challenge:
Initially, I set up a cron rule to check temperatures every 5 minutes. The rule works by comparing the current temperature to a target range and turning the actuators on or off accordingly. However, as I added more zones, I realized how repetitive the code was. Copying and pasting for each sensor/actuator pair wasn’t efficient, and it made maintaining the system a hassle. 
The Solution:
After some research, I discovered the power of using groups in OpenHAB. By grouping all my temperature sensors and actuators, I can now iterate through them in a single rule. This means I don’t have to manually update each zone—OpenHAB handles it all! Plus, averaging multiple sensor readings in a zone ensures more accurate temperature control.
Tips for Others:
If you’re looking to set up a similar system, here are a few tips:
- Start small and test your zones individually before scaling up.
- Use groups to simplify your rules and reduce redundancy.
- Don’t forget to consider hysteresis to prevent frequent on/off cycling of your actuators.
I’m really happy with how this setup is coming together. It’s made my home more comfortable and efficient, and I can’t wait to share more as I continue to refine it! 
Have you tackled a similar project? I’d love to hear your experiences and tips in the comments below! 