This is an implementation of the ESPHoime component to control HVAC on the base of the SmartAir2 and hOn Haier protocols (AC that is controlled by the hOn or SmartAir2 application).
There are two versions of the Haier protocol. The older one is using an application called SmartAir2 and the newer one - an application called hOn. Both protocols are compatible on the transport level but have different commands to control appliances.
Older Haier models controlled by the SmartAir2 application are using the KZW-W002 module that looks like this:
This module can't be reused, and you need to replace it with an ESP (RPI pico w) module. The USB connector on a board doesn't support the USB protocol. It is a UART port that just uses a USB connector. To connect the ESP board to your AC you can cut a USB type A cable and connect wires to the climate connector.
Haier UART pinout:
| Board | USB | Wire color | ESP module |
|---|---|---|---|
| 5V | VCC | red | 5V |
| GND | GND | black | GND |
| TX | DATA+ | green | RX |
| RX | DATA- | white | TX |
You can use this component together with a native Haier ESP32 device: Newer Haier models using a module called ESP32-for-Haier. It is an ESP32 single-core board with an ESP32-S0WD chip. The module board looks like this:
Front:
Back:
In some cases, you can reuse this module and flash it with ESPHome, but some new modules don't support this. They look the same but have encryption enabled.
Warning! The new generation of ESP32-Haier devices has encryption enabled, so they can only be flashed with firmware that is signed with a private key. There is no way to make them work with ESPHome, so if you try to do it, the board will get into a boot loop with error
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
The only way to recover this board is to flash it with the original image. So before starting your experiments make a backup image: How to backup the original image and flash ESPHome to the ESP32 Haier module
Also, you can use any other ESP32, ESP8266 or a RPI pico W board. In this case, you will need to cut the original wire or make a connector yourself (the board has a JST SM04B-GHS-TB connector)
The configuration will be a little bit different for different protocols. For example, the SmartAir2 protocol doesn't support cleaning, setting air direction (just swing on/off) etc.
uart:
baud_rate: 9600
tx_pin: 17
rx_pin: 16
id: ac_port
climate:
- platform: haier
id: haier_ac
protocol: hOn
name: Haier AC
uart_id: ac_port
wifi_signal: true # Optional, default true, enables WiFI signal transmission from ESP to AC
beeper: true # Optional, default true, disables beep on commands from ESP
display: true # Optional, default true, can be used to turn off LED display
answer_timeout:: 200ms # Optional, request answer timeout, can be used to increase the timeout
# for some ACs that have longer answer delays
outdoor_temperature: # Optional, outdoor temperature sensor
name: Haier AC outdoor temperature
visual: # Optional, you can use it to limit min and max temperatures in UI (not working for remote!)
min_temperature: 16 °C
max_temperature: 30 °C
temperature_step: 1 °C
supported_modes: # Optional, can be used to disable some modes if you don't need them
- 'OFF'
- AUTO
- COOL
- HEAT
- DRY
- FAN_ONLY
supported_presets: # Optional, can be used to disable some presets if your AC does not support it
- ECO
- BOOST
- SLEEP
supported_swing_modes: # Optional, can be used to disable some swing modes if your AC does not support it
- 'OFF'
- VERTICAL
- HORIZONTAL
- BOTH
uart:
baud_rate: 9600
tx_pin: 1
rx_pin: 3
id: ac_port
climate:
- platform: haier
id: haier_ac
protocol: smartAir2
name: Haier AC
uart_id: ac_port
wifi_signal: true # Optional, default true, enables WiFI signal transmission from ESP to AC
display: true # Optional, default true, can be used to turn off LED display
answer_timeout: 200ms # Optional, request answer timeout, can be used to increase the timeout
# for some ACs that have longer answer delays
visual: # Optional, you can use it to limit min and max temperatures in UI (not working for remote!)
min_temperature: 16 °C
max_temperature: 30 °C
temperature_step: 1 °C
supported_modes: # Optional, can be used to disable some modes if you don't need them
- 'OFF'
- AUTO
- COOL
- HEAT
- DRY
- FAN_ONLY
supported_presets: # Optional, can be used to disable some presets if your AC does not support it
- BOOST
- COMFORT
supported_swing_modes: # Optional, can be used to disable some swing modes if your AC does not support it
- 'OFF'
- VERTICAL
- HORIZONTAL
- BOTH
- id (Optional, ID): Manually specify the ID used for code generation
- uart_id (Optional, ID): ID of the UART port to communicate with AC
- protocol (Required, string): Defines protocol of communication with AC. Possible values: hon or smartair2
- name (Required, string): The name of the climate device
- wifi_signal (Optional, boolean): If true - send wifi signal level to AC (Olny for devices that support this feature)
- beeper (Optional, boolean): (supported only by hOn) Can be used to disable beeping on commands from AC
- answer_timeout (Optional, Time): Can be used to change default answer timeout. Can help in case AC takes longer to answer requests (some Candy models).
- outdoor_temperature (Optional): (supported only by hOn) Temperature sensor for outdoor temperature
- name (Required, string): The name of the sensor.
- id (Optional, ID): ID of the sensor, can be used for code generation
- All other options from Sensor.
- supported_modes (Optional, list): Can be used to disable some of AC modes. Possible values: OFF (use quotes in opposite case ESPHome will convert it to False), AUTO, COOL, HEAT, DRY, FAN_ONLY
- supported_presets (Optional, list): Optional, can be used to disable some presets. Possible values: BOOST, COMFORT for SmartAir2, or ECO, BOOST, SLEEP for hOn.
- supported_swing_modes (Optional, list): Can be used to disable some swing modes if your AC does not support it. Possible values: OFF (use quotes in opposite case ESPHome will convert it to False), VERTICAL, HORIZONTAL, BOTH
- All other options from Climate.
Haier climate support some actiuons:
This action turns AC power on
on_...:
then:
climate.haier.power_on: device_id
This action turns AC power off
on_...:
then:
climate.haier.power_off: device_id
This action toggles AC power
on_...:
then:
climate.haier.power_toggle: device_id
This action turns the AC display on
on_...:
then:
climate.haier.display_on: device_id
This action turns the AC display off
on_...:
then:
climate.haier.display_off: device_id
Turn on health mode (UV light sterilization)
on_...:
then:
climate.haier.health_on: device_id
Turn off health mode
on_...:
then:
climate.haier.health_off: device_id
(supported only by hOn) This action enables beep feedback on every command sent to AC
on_...:
then:
climate.haier.beeper_on: device_id
(supported only by hOn) This action disables beep feedback on every command sent to AC (keep in mind that this will not work for IR remote commands)
on_...:
then:
climate.haier.beeper_off: device_id
(supported only by hOn) Set direction for vertical airflow if the vertical swing is disabled. Possible values: Up, Center, Down.
on_...:
then:
- climate.haier.set_vertical_airflow:
id: device_id
vertical_airflow: Up
(supported only by hOn) Set direction for horizontal airflow if the horizontal swing is disabled. Possible values: Left, Center, Right.
on_...:
then:
- climate.haier.set_horizontal_airflow:
id: device_id
vertical_airflow: Right
(supported only by hOn) Start self-cleaning
on_...:
then:
- climate.haier.start_self_cleaning: device_id
(supported only by hOn) 56°C steri-cleaning
on_...:
then:
- climate.haier.start_steri_cleaning: device_id
It is strongly recommended to make a backup of the original flash content before flashing ESPHome!
To make a backup and to flash the new firmware you will need to use a USB to TTL converter and solder wires to access UART0 on board (or use something like this: Pogo Pin Probe Clip 2x5p 2.54 mm)
UART0 pinout:
To put the device in the flash mode you will need to shortcut GPIO0 to the ground before powering the device.
Once the device is in flash mode you can make a full backup of the original firmware in case you would like to return the module to its factory state. To make a backup you can use esptool. Command to make a full flash backup:
python esptool.py -b 115200 --port <port_name> read_flash 0x00000 0x400000 flash_4M.bin
After this, you can flash firmware using ESPHome tools (dashboard, website, esphome command, etc)