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title Deta Grid Connect Smart Fan Speed Controller with Touch Light Switch
date-published 2021-02-02
type switch
standard au
board bk72xx

General Information

Deta 6914HA is a smart fan controller with light switch sold in Australia and New Zealand.

Series 1

Original version uses ESP8266 controller.

Series 2

Newer revision uses BK7231T controller on the Tuya WB3S module.

Series 3

revision uses BK7231N controller on the Tuya CB3S module

GPIO Pinout

ESP8266 Version

GPIO # Component
GPIO00 Button2
GPIO01 None
GPIO02 None
GPIO03 LedLink
GPIO04 Relay3
GPIO05 Button3
GPIO09 None
GPIO10 None
GPIO12 None
GPIO13 Relay2
GPIO14 Relay1
GPIO15 Relay4
GPIO16 Button1
FLAG None

BK72xx Version

Pin # Component
P14 Button1
P1 Button2
P8 Button3
P10 Led
P26 Light Relay
P6 Fan Relay 1
P7 Fan Relay 2
P9 Fan Relay 3

BK7231N Version

Pin # Component
P14 Button1
P20 Button2
P7 Button3
P10 Led
P26 Light Relay
P6 Fan Relay 1
P8 Fan Relay 2
P9 Fan Relay 3

Getting it up and running

Series 1 - Tuya Convert

These switches are Tuya devices, so if you don't want to open them up to flash directly, you can attempt to use tuya-convert to initially get ESPHome onto them however recently purchased devices are no longer Tuya-Convert compatible. There's a useful guide to disassemble and serial flash similar switches on Mike McGuire's blog. After that, you can use ESPHome's OTA functionality to make any further changes.

  • Put the switch into "smartconfig" / "autoconfig" / pairing mode by holding any button for about 5 seconds.
  • The status LED (to the side of the button(s)) blinks rapidly to confirm that it has entered pairing mode.

Series 2 - Cloudcutter

Cloudcutter is a tool designed to simplify the flashing process. Follow the official guide for instructions.

Manual Flashing

If you prefer to flash manually, you'll need a USB to serial adapter. Follow the disassembly steps below:

  1. Remove the front plastic face.
  2. Unscrew the exposed screws.
  3. Remove the clear panel and the small PCB underneath.

Configuration Examples

Series 1 (ESP8266)

substitutions:
  device_name: deta_fan_controller
  friendly_name: "Deta Smart Fan Speed Controller"

##########################

esphome:
  name: ${device_name}

esp8266:
  board: esp01_1m
  restore_from_flash: true

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:

captive_portal:

sensor:
  - platform: wifi_signal
    name: ${friendly_name} Wifi Signal Strength
    update_interval: 60s
  - platform: uptime
    name: ${friendly_name} Uptime

text_sensor:
  - platform: wifi_info
    ip_address:
      name: ${friendly_name} IP
    ssid:
      name: ${friendly_name} SSID
    bssid:
      name: ${friendly_name} BSSID
    mac_address:
      name: ${friendly_name} Mac

logger:

api:

ota:

web_server:
  port: 80

light:
  - platform: binary
    output: relay_light
    id: light1
    name: ${friendly_name} Light

status_led:
  pin:
    number: GPIO3
    inverted: True

output:
  - platform: gpio
    id: relay_light
    pin: GPIO14
  - platform: template
    id: fan_speed
    type: float
    write_action:
      - then:
        - if:
            condition:
              lambda: return ((state > 0) && (state < .4));
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_off: relay_fan_2
              - delay: 20ms
              - switch.turn_off: relay_fan_3
        - if:
            condition:
              lambda: return ((state > .4) && (state < .7));
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_off: relay_fan_2
              - delay: 20ms
              - switch.turn_on: relay_fan_3
        - if:
            condition:
              lambda: return (state > .7);
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_on: relay_fan_2
              - delay: 20ms
              - switch.turn_on: relay_fan_3
        - if:
            condition:
              lambda: return (state < 0.01);
            then:
              - switch.turn_off: relay_fan_1
              - delay: 20ms
              - switch.turn_off: relay_fan_2
              - delay: 20ms
              - switch.turn_off: relay_fan_3

binary_sensor:
  - platform: gpio
    id: fan_light_sensor
    pin:
      number: GPIO16
      mode: INPUT
      inverted: True
    on_press:
      - light.toggle: light1
  - platform: gpio
    id: fan_power_sensor
    pin:
      number: GPIO00
      mode: INPUT
      inverted: True
    on_press:
      then:
        - fan.toggle: fan_1
  - platform: gpio
    id: fan_speed_sensor
    pin:
      number: GPIO05
      mode: INPUT
      inverted: True
    on_press:
      then:
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 2
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 3
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_on: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 1

fan:
  - platform: speed
    id: fan_1
    output: fan_speed
    name: ${friendly_name} Fan Speed
    speed_count: 3

switch:
  - platform: restart
    name: ${friendly_name} REBOOT
  - platform: gpio
    id: relay_fan_1
    pin: GPIO13
  - platform: gpio
    id: relay_fan_2
    pin: GPIO04
  - platform: gpio
    id: relay_fan_3
    pin: GPIO15
  - platform: template
    id: update_fan_speed
    optimistic: True
    turn_on_action:
      then:
        - delay: 200ms
        - if:
            condition:
              and:
                - switch.is_off: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_off: fan_1
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 1
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 2
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_on: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 3

Series 2 (BK72xx)

substitutions:
  devicename: "deta-switchfan"
  friendlyname: Deta Switch Fan
  deviceid: deta-switchfan
  devicemodel: Deta Grid Connect 6914HA Series 2

#################################

esphome:
  name: ${devicename}

bk72xx:
  board: generic-bk7231t-qfn32-tuya

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:

logger:

web_server:

captive_portal:

api:

ota:

sensor:
  - platform: wifi_signal
    name: ${friendlyname} Wifi Signal Strength
    update_interval: 60s
  - platform: uptime
    name: ${friendlyname} Uptime

text_sensor:
  - platform: wifi_info
    ip_address:
      name: ${friendlyname} IP
    ssid:
      name: ${friendlyname} SSID
    bssid:
      name: ${friendlyname} BSSID
    mac_address:
      name: ${friendlyname} Mac
  - platform: version
    name: ${friendlyname} ESPHome Version

#################################
status_led:
  pin:
    number: P10
    inverted: true

light:
  - platform: binary
    output: relay_light
    id: light1
    name: ${friendlyname} Light

output:
  - platform: gpio
    id: relay_light
    pin: P26
  - platform: template
    id: fan_speed
    type: float
    write_action:
      - then:
        - if:
            condition:
              lambda: return ((state > 0) && (state < .4));
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_off: relay_fan_2
              - delay: 20ms
              - switch.turn_off: relay_fan_3
        - if:
            condition:
              lambda: return ((state > .4) && (state < .7));
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_on: relay_fan_2
              - delay: 20ms
              - switch.turn_off: relay_fan_3
        - if:
            condition:
              lambda: return (state > .7);
            then:
              - switch.turn_on: relay_fan_1
              - delay: 20ms
              - switch.turn_on: relay_fan_2
              - delay: 20ms
              - switch.turn_on: relay_fan_3
        - if:
            condition:
              lambda: return (state < 0.01);
            then:
              - switch.turn_off: relay_fan_1
              - delay: 20ms
              - switch.turn_off: relay_fan_2
              - delay: 20ms
              - switch.turn_off: relay_fan_3

binary_sensor:
  - platform: gpio
    id: fan_light_sensor
    pin:
      number: P14
      mode: INPUT
      inverted: True
    on_press:
      - light.toggle: light1
  - platform: gpio
    id: fan_power_sensor
    pin:
      number: P1
      mode: INPUT
      inverted: True
    on_press:
      then:
        - fan.toggle: fan_1
  - platform: gpio
    id: fan_speed_sensor
    pin:
      number: P8
      mode: INPUT
      inverted: True
    on_press:
      then:
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 2
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 3
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_on: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 1

fan:
  - platform: speed
    id: fan_1
    output: fan_speed
    name: ${friendlyname} Fan Speed
    speed_count: 3

switch:
  - platform: gpio
    id: relay_fan_1
    pin: P6
  - platform: gpio
    id: relay_fan_2
    pin: P7
  - platform: gpio
    id: relay_fan_3
    pin: P9
  - platform: template
    id: update_fan_speed
    optimistic: True
    turn_on_action:
      then:
        - delay: 200ms
        - if:
            condition:
              and:
                - switch.is_off: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_off: fan_1
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_off: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 1
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_off: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 2
        - if:
            condition:
              and:
                - switch.is_on: relay_fan_1
                - switch.is_on: relay_fan_2
                - switch.is_on: relay_fan_3
            then:
              - fan.turn_on:
                  id: fan_1
                  speed: 3