Mitsubishi Electric Air-Co control for HomeKit

Add your Air Conditioner or the ATW unit to HomeKit smarthome infrastructure. Use Siri voice control and all the scripting potential from Apple

Supported platforms

• ESP8266
• ESP32

Dependencies

• MEL-AC library - the Mitsubishi Electric protocol implementation
• HomeKit ADK library which is port of the official Apple HomeKit ADK
• WiFi Setup library - Web-based WiFi setup captive portal

Accessory design

Identification

Build in LED blinks during the identification

HomeKit services

• Thermostat - used to control Heat, Cool, Auto mode and Power ON / OFF
• Fan - control the fan speed
• Vane horizontal - (not visible in Home App yet, use Eve) control up-down vane
• Vane vertical - (not visible in Home App yet, use Eve) control left-right vane
• Fan mode - turns Fan only mode, Thermosat is disabled for this
• Dry mode - turns Dry mode, Thermosat is disabled for this

HomeKit Status Active reporting the HVAC interface connected / disconnected

Mitsubishi Electric protocol limitations:

• HomeKit widget changes apply time up to 2 seconds
• HVAC parameter or room temperature changes sync time up to 8 seconds.

LED indication

• LED blink on remote params change app.blink_ms_sync
• LED blink on new params apply app.blink_ms_update
• LED blink on room temp change app.blink_ms_room

Setup

Using the Mongoose OS framework:

$ mos build
$ mos flash

WiFI settings

Connect WiFi access point name MEL-XXXX password macdrive, select home network and save credentials

Factory reset

Hold a button for factory reset. This will remove WiFi settings, HAP server status.

Configuration:

  - ["pins.button", "i", -1, {title: "Button GPIO pin"}]
  - ["pins.button_hold_ms", "i", 5000, {title: "Button hold time for reset"}]
  - ["pins.button_pull_up", "b", true, {title: "Button pull up or down"}]

ToDo

Index page for Web GUI holding the device information and factory reset feature

Known issues

ESP32 platform works well with mos tool 2.19.1, but not with newer. The issue is related to UART driver and still under investigation

Copyrights

• d4rkmen
• Deomid "rojer" Ryabkov
• The HomeKit ADK Contributors