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Comment by robbiep | Hacker News Reader

That’s incredible.

I have an airtouch which I love but my parents have a Mitsubishi system that I’m fairly sure would be compatible, and a large floor space to manage.

Apologies for the question, but for multi zone, you mention that the controller can pick up temperature. My understanding was that temperature is only captured at the intake, not in zones? (I’m familiar with airtouch where I have ?BTLE temperature sensors in the rooms/zones that are paired to my system). But how does this work with a Mitsubishi zoned system? Or am k over-reading the capabilities. (Or is it a similar deal, I just haven’t seen where to acquire these zone temp sensors from)

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Thanks! I just took a look at AirTouch. It seems they have a nice ecosystem. Their Mitsubishi Electric offerings [1] use the CN105 port (like the OP's device).

I use the word zones on the Serin Multi Zone product page but it's interchangeable with indoor units. One indoor unit equals one zone.

You can override the room (intake) temperature per indoor unit/zone using a controller plugged into the CN105 port (like the OP wrote about). Depending on the controller, it can pair with a Bluetooth sensor or listen to any other type of sensor from Home Assistant. By going the ESP32 path, you can use simple, off the shelf $10 BLE sensors.

The Serin multi zone controller uses the centralized communication bus which isn't capable of overriding the indoor unit's room (intake) temperature. But if that is a must (which it is for ducted units), you can have both the multi-zone controller and a controller at every indoor unit without issue. So if you have an MHK2 thermostat on the wall and don't want to use their Kumo app anymore, the Serin multi zone controller will give you local control and you'll be able to retain the remote temperature sensor from the MHK2 thermostat.

[1] https://theairstore.com.au/product/airtouch-gateway-mitsubis...

I appreciate you taking the time to reply - that helps a lot. So essentially I get this and plug it into the CN105 port, and then everything will be in home assistant and I can get room/zone temperature control via BLE as well.

Spot on. If you're using Home Assistant, you can push any temperature sensor available. Zigbee, Zwave, BLE, 433mhz rtl sdr, etc. At one point, I was using the proprietary temperature sensors that were paired with my ecobee thermostat (for my ancient natural gas fired hydronic boiler). For the BLE sensors, your HA server must have bluetooth capabilities. I use a bluetooth dongle attached to a short USB extension cord.

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