Modern buildings have advanced HVAC systems, but they keep the data for themselves. Let’s fight that. =)

I got access to an X Aircontrol from Trox Technik, ZoneMaster HVAC system. It has a web server, so I started playing to see what data could be extracted.

I ended up with this script xaircontrol, which can send data to Grafana via Collectd.

We’ve used it to make some sweet floorplans.

“If you can’t measure it, you can’t improve it.”

Reducing energy usage is hard if you can’t see it. Here’s a cheap way to graph home or office energy usage.

By reading data from the energy meter, one can get super accurate, real-time usage data.

I’ve used:

• A smart home controller, Home Assistant
• A graphing system, Grafana
• A micro controller, esp8266, ~$5
• An LDR sensor, $1

You need some familiarity with all of the above to set this up.