Mitsubishi Heat Pump Controller | ESPHome | Page 1

sly elbow May 15, 2024, 5:09 PM

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The official Mitsubishi cloud integration device costs anywhere from $200 to $300, tattles on you to Salesforce, and overall is just not great. Let’s solve all these problems by making our own! This does support OEM thermostats as well, which is great for family approval factor.

Pictured is rev2 of the control board, the mini control board (which doesn't support OEM thermostats), and rev1 in situ. Parity with the official controls has mostly been achieved, and progress is being made on the last few steps.

Software is based on the Mitsubishi-UART project (https://muart-group.github.io/), which has aspirations of one day making it into ESPHome proper. None of this would have been possible without SwiCago’s amazing work as well, so hats off to him.

I went with the WT32-ETH01 for this project, though this should work with anything that supports hardware or software UART (so our ESP8266 friends can join the party). The BOM also includes a level shifter and a buck converter, just for better power and a safety margin, since we are working with very expensive devices.

verbal sky May 25, 2024, 6:10 PM

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I'm looking at getting Mitsubishi heat pumps for my new house. Is a level shifter/buck convertor required if I'm using a Wemos D1 Mini that can do 5V input and 3.3V TTL?

sly elbow May 25, 2024, 7:46 PM

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verbal sky I'm looking at getting Mitsubishi heat pumps for my new house. Is a level shifte...

nope. i did that out of safety, but plenty of people have just wired it directly. all the units i've seen are perfectly ok with 3.3 in, so as long as your chip can handle 5 it should be ok. i probably would recommend level shifters if you're trying to also use an MHK or other controller though.

verbal sky May 26, 2024, 12:33 AM

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I have no setup yet. Do the MHK controllers work with the ESPhome setup?

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I'm actually specing out the system, and I'd like remote temperature sensors (that arent part of HA) and a thermostat on the wall.

sly elbow May 26, 2024, 12:37 AM

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the muart-group project kinda does

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(disclaimer: i'm one of the devs over there) MHK controller support is like.... 80% there. you can change temperature, mode, etc. just fine. dual setpoint doesnt work quite yet, schedules can conflict, and if you set HA to "auto" mode, the MHK will steal control, and no humidity reporting yet.

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it's still a work in progress, but it's happening

verbal sky May 26, 2024, 12:55 AM

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so by the time my house is rebuilt it may have support (and which MHK controller?)

sly elbow May 26, 2024, 1:25 AM

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verbal sky so by the time my house is rebuilt it may have support (and which MHK controller...

Sam and I have MHK2s, so that’s what we’re targeting.

merry venture Aug 21, 2024, 10:12 PM

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The new version of the Faikin modules should work well for this too, with a pull-up on the RX line: https://github.com/revk/ESP32-Faikin

#Mitsubishi Heat Pump Controller