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
- LIN Tranceiver
- MCP-2025-330 (or similar)
- http://ww1.microchip.com/downloads/en/DeviceDoc/20002306B.pdf
- 10uF Capacitor
- 10k Resistor
- 12v -> 3.3v (500mA+) voltage regulator