from Hacker News

OpenTherm: Universal protocol for smart home heating systems

by singingwolfboy on 1/25/25, 8:11 PM with 3 comments

• by pandora-health on 1/26/25, 8:18 AM

  The only open source implementation of OpenTherm (and EMS bus too now) that actually works (unlike commercial thermostats) and provides low load and weather compensation at the same time is:

  https://github.com/Alexwijn/SAT

  PID is used to smooth out weather compensation errors.

  See my grafana for realtime boiler and cost data:

  https://gasboiler.grafana.net/public-dashboards/8d44381aafa9...

• by DamonHD on 1/25/25, 8:16 PM

  "The original protocol is only available for members."

  Not "open" IMHO.