Intro

This project uses Fujitsu's proprietary protocol to control a Fujitsu AC(heat pump) unit, interfacing with Home Assistant through ESPHome.

This project is entirely based on unreality FujiHeatPump project. Huge thanks to unreality and jaroslawprzybylowicz!

How to use:

Hardware:

See FujiHeatPump's readme file, I use that exact circuit with a ESP32 development board. IMPORTANT: I connected the MCP2025 TX RX to the ESP32's Serial 2 line, I used the Serial 1 line for debugging.

ESPHome:

Copy all files under src into ESPHome config folder, next to the yaml file.

- config_folder
|- fujitsu.yaml
|- FujiHeatPump.cpp
|- FujiHeatPump.h
|- FujitsuClimate.cpp
|- FujitsuClimate.h

See fujitsu.yaml for a sample config file. Then run your esphome (tested with esphome version 2022.2.3) compile or upload command:

$ esphome compile fujitsu.yaml

Default behaviour:

• The MCP2025 is connected to Serial 2
• The controller is registered as secondary controller, see void FujitsuClimate::setup() in FujitsuClimate.cpp
• My AC works on 1 degree C step, 16-30 degree temperature range etc... see void climate::ClimateTraits FujitsuClimate::traits() in FujitsuClimate.cpp for more details, modify the function to suit your unit.

Known issues:

• Sometimes a command is sent but somehow it fails to control the unit, I would have to resend the command from Home Assistant
• Setting ECO mode from Home Assistant does not work, but receiving ECO mode change from the controller is fine

Planned work:

• Make traits configurable through the yaml config file
• Get this project merged into the main ESPHome repository

How to contirbute:

• Use github issues to start a discussion
• Create pull requests