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Fujitsu AirConditioner Controller for HomeKit

Flash to an M5Atom, and add your Fujitsu AirConditioner (Heatpump) to your HomeKit home. Should work with most other ESP32 kits as well.

Quick start

  • Download the latest release
  • Download NodeMCU PyFlasher
  • Plug in your M5Atom
  • Launch NodeMCU PyFlasher
    • Set your serial port
    • Select the downloaded .bin file as your NodeMCU firmware
    • Select 'Dual I/O (DIO)' as Flash mode
    • Erase flash to 'yes'
  • Click 'Flash NodeMCU'

You can either use the built in SoftAP mode to configure the WiFi details and pairing key:

  • Hold down the button for 3 seconds until the LED flashes cyan quickly
  • Press the button 3 times, the LED should triple-blink
  • Hold the button for 3 seconds again to enter AP configuration mode
  • Connect to the 'Fujitsu Airconditioner XXXXXX' AP that should now be available and enter your WiFi details and setup code

Or the serial monitor:

  • Open Serial Monitor
  • Enter 'S ' to define the HomeKit pairing pin (eg 'S 11122333')
  • Enter 'W' to enter WiFi connection details

Connect the unit:

  • Connect the M5Atom to the AirConditioner via the 3-wire interface (see example circuit) or via the com connector on the indoor unit (will need a logic level converter)
  • Power-Cycle your air conditioner.
    • You may need to toggle the dip switch on the Primary controller so that it 'forgets' its setup.

Secondary Mode

By default the controller binds to the indoor unit as a secondary controller. If you do not have an existing wall remote controller, you will need to edit FujiHeatPump initialisation to bind as a primary controller.

QR Code

You can generate a QR code to scan with Home.app by using the QR code generator tool

# python3 gen_qrcode 21 111-22-333 FUJI output.png

Alternatively, you can use an online QR code generator such as the-qrcode-generator.com, just enter the generated setup payload which is printed after you enter your custom pairing pin (eg X-HM://00KUG4GWTFUJI)

Example Circuit

Other ESP Boards

This controller should work fine on other ESP boards, with the following setup:

  • GPIO 19 - LIN RX
  • GPIO 22 - LIN TX
  • GPIO 27 - NeoPixel Compatible LED (SK6812/WS2812C/etc)

Parts Required