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DETA Grid Connect Smart Dimmer Switch 6910HA

DETA Grid Connect Smart Dimmer Switch 6910HA

Device Type: dimmer
Electrical Standard: au
Board: esp8266

General Notes

The DETA Smart Dimmer Switch 6910HA uses the UART on GPIO 1 and 3. This switch comes with a WB3S chip and requires replacement in order to be used with ESPHome. It is still possible to convert these switches to ESPHome by replacing the WB3S chip with a ESP-12F chip and adding a 10k pull-down resister on GPIO15 as WB3S does not require it and omits it from the board.

GPIO Pinout

PinFunction
GPIO1UART TX
GPIO3UART RX
EN10k pull-up
RES10k pull-up
GPIO1510k pull-down

Getting it up and running

These switches are Tuya devices, however as the main W3BS chip needs to be replaced with a ESP12F it is best to serial flash the unit. There's useful guide to disassemble and serial flash these switches here. After that, you can use ESPHome's OTA functionality to make any further changes.

Dimmer Configuration

substitutions:
  device_name: detadimmerwitch
  friendly_name: "Dimmer Switch"


esphome:
  platform: ESP8266
  name: ${device_name}


esp8266:
  board: esp01_1m
  restore_from_flash: true
    
# OTA flashing
ota:
  - platform: esphome


wifi: # Your Wifi network details
  
# Enable fallback hotspot in case wifi connection fails  
  ap:


# Enable Home Assistant API
api:


# Enable the captive portal
captive_portal:


# Enable the Web Server component 
webserver:


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


#################################
# disable logging over UART
logger:
  baud_rate: 0


# setup UART for Tuya mcu
uart:
  rx_pin: GPIO3
  tx_pin: GPIO1
  baud_rate: 9600


# Register the Tuya MCU connection
tuya:


# light settings
light:
  - platform: "tuya"
    name: "${friendly_name}"
    # dimmers current value
    dimmer_datapoint: 2
    # dimmer on/off
    switch_datapoint: 1
    min_value: 0
    max_value: 1000


switch:
  - platform: restart
    name: "${friendly_name} REBOOT"
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