HomeKit Daikin/Dyson infrared accessory

An Apple HomeKit accessory for an infrared remote controller.

Currently supporting:

• Daikin FTXS50KAVMA reverse cycle air conditioner
• Dyson Hot + Cool AM09 fan heater

Hardware

• Duinotech infrared receiver XC-4427 (Jaycar)
• Duinotech infrared transmitter XC-4426 (Jaycar)

Optional temperature sensor

If you'd like to get feedback in the Apple Home app of the current room temperature, add a DHT22 sensor.

• DHT22 temperature/humidity sensor (Core Electronics)

Note: for wiring and software of the DHT22, see this branch: add/1-dht22-temperature-sensor

Wiring

Raspberry Pi pin	Infrared receiver pin
9 Ground	-
11 GPIO17	s
17 3.3V	middle

Raspberry Pi pin	Infrared transmitter pin
14 Ground	-
12 GPIO18	s
01 3.3V	middle

Software

• Install LIRC: sudo apt install lirc
• Copy the Daikin configuration codes file: sudo cp codes/daikin.lircd.conf /etc/lirc/lircd.conf.d/
• Restart LIRCd: sudo systemctl restart lircd
• Build the HomeKit executable: go build homekit-daikin-infrared.go
• Run the executable: ./homekit-daikin-infrared or run the go file directly go run homekit-daikin-infrared.go
• In the Home app on your iOS device, add a new accessory with the code: 00102003
• To control a Dyson Hot + Cool AM09 fan heater, run with the -dyson flag: go run homekit-daikin-infrared.go -dyson

LIRC

To detect IR codes, run: mode2

If pressing your remote doesn't output anything, try: mode2 --driver default

You can also set this as a default by editing /etc/lirc/lirc_options.conf

# /etc/lirc/lirc_options.conf
driver = default
device = /dev/lirc0

If you install both the decoder and transmitter, the devices will appear:

• Transmitter: /dev/lirc0
• Decoder: /dev/lirc1

Decoding Daikin IR codes

Find my collection of Daikin FTXS50KAVMA infrared codes in the /codes/daikin folder.

This was the process to create these text files:

• Run: mode2 --driver default > power_on.txt
• Press the power on button on your remote once
• <control> + c to quit

I modified Ben's code a little to convert those LIRC pulse widths into binary strings.

Find the decoder at /codes/decode.py:

• Run: python3 decode.py power_on.txt

Sample output: 00000BA1000100001011011111001000000000010100011000000000000000011101011BA1000100001011011111001000000000001000010000010011101110011111000BA10001000010110111110010000000000000000001001001001001100000000000000010100000000000000000110000000000110000000000000000010000011000000000000000000101010E

Where:

• A = start of line
• B = end of line
• E = end of command

If you'd like to create a remote control codes file *.lircd.conf of your own, here are some instructions:

• Run mode2 with column display mode on: mode2 --driver default -d /dev/lirc1 -m
• Remove the end of line/start of line/end of command output (including the last pulse)
• Copy it inbetween begin raw_codes and end raw_codes with a header name YOUR_COMMAND_NAME

Daikin FTXS50KAVMA IR codes

Here are the hex codes from the binary strings decode.py output:

# Power on

00 00
88 5B E4 00 A3 00 00 EB
88 5B E4 00 42 09 DC F8
11 0B 7C 80 00 12 49 80 00 A0 00 0C 00 C0 00 10 60 00 05

# Power off

00 00
88 5B E4 00 A3 00 00 EB
88 5B E4 00 42 A9 DC 24
11 0B 7C 80 00 02 49 80 00 A0 00 0C 00 C0 00 10 60 00 19

# Temperature up

00 00
88 5B E4 00 A3 00 00 EB
88 5B E4 00 42 E9 DC 64
11 0B 7C 80 00 02 45 80 00 A0 00 0C 00 C0 00 10 60 00 15

# Temperature down

00 00
88 5B E4 00 A3 00 00 EB
88 5B E4 00 42 19 DC E4
11 0B 7C 80 00 02 49 80 00 A0 00 0C 00 C0 00 10 60 00 19

The lengths seem to match these reversed Daikin codes for a ARC470A1 remote.

Sending IR codes

There's a sample LIRC config file: /codes/daikin/daikin.lircd.conf

The POWER_ON command sets the heating/cooling mode auto, fan mode auto, temperature 23.

There are individual temperature commands also with the mode auto, fan mode auto, e.g. TEMPERATURE_AUTO_18

This avoids having to deal with generating a dynamic .conf file for now.

• Copy it to the right location: sudo cp codes/daikin/daikin.lircd.conf /etc/lirc/lircd.conf.d/
• Restart LIRCd: sudo systemctl restart lircd
• Send your command: irsend SEND_ONCE daikin POWER_ON

Sending also works via the Go LIRC client: /infrared-send/infrared-send.go

• Modify your command in: infrared-send.go
• Send it: go run infrared-send.go

TODO

• Decode IR codes for all of the functions we'd like to use
• Send those IR codes using the Go LIRC client
• Setup HAP Go library to send IR codes
• Add a DHT22 temperature sensor to get the current temperature (see add/1-dht22-temperature-sensor)
• Write Go struct to programmatically create and send IR codes
• Setup GAP Go library to receive air conditioner commands

Useful links

• Daikin remote: https://github.com/mharizanov/Daikin-AC-remote-control-over-the-Internet
• Arduino IRremote including Daikin: https://github.com/crankyoldgit/IRremoteESP8266
• Daikin IR protocol: https://github.com/blafois/Daikin-IR-Reverse
• Daikin Pi: https://github.com/dannyshaw/daikin-pi
• IR transmitter: https://core-electronics.com.au/digital-ir-transmitter-module-arduino-compatible.html
• HAP Go library: https://github.com/brutella/hap
• Go client for LIRC (Linux Infrared Remote Control): https://github.com/chbmuc/lirc