About the project
At first I was just willing to switch on/off the DHW relying on Home Assistant as I hacked previously with my gas boiler. After a few thinking, I wanted to ditch the wire for remote controller, to allow for free placement of the temperature sensors (i.e. samsung wireless nasa). In the end, I ended up rewriting a NASA-MQTT bridge in python, allowing all the previous, and many more.
Hardware parts
I'm connecting using the F3/F4 pair, and a wireless raspberry pi zero w.
The tricky part was to find how to communicate with the F3/F4 bus, using a THVD8000 proved useful and efficient.
I'm designing a PCB to allow for USB<->F3/F4 to allow for more people to play with this.
How to
Just execute the samsung_mqtt_home_assistant.py script after tweaking its values (extended configuration means to come)
Demo
Here is a screenshot of the available items for my Samsung Mono R290 5kW (AE050CXYBEK/EU)
Future evolutions
Many things are under construction:
- A PCB for remote controller to go wireless (still using a plug adapter, but wirelessing the F3/F4 bus)
- Home Assistant scripts to allow for aggregating multiple temperature sensor and set the zone 1/2 current temp according to user rules (min of, max of ...)
- Some sliders in home assistant to adjust target temperatures and min/max flow temperatures.
Credits
- Super project to get started on protocol stuff [https://wiki.myehs.eu/wiki/NASA_Protocol]
- Another bridging device [https://github.com/lanwin/esphome_samsung_ac]
- For some ideas [https://github.com/Foxhill67/nasa2mqtt]