DETA Grid Connect Smart Dimmer Switch 6910HA

General Notes

The DETA Smart Dimmer Switch 6910HA This device comes with a Tuya WB3S chip and there are now two methods to make this device compatible with ESPHome:

1. Use Cloudcutter to flash the device.
2. Swap out the chip with a compatible one.

Using Cloudcutter

Cloudcutter is a tool designed to simplify the process of flashing Tuya-based devices. It allows you to bypass the need for physically opening the device and swapping out chips. By leveraging the cloud APIs, Cloudcutter enables you to flash the firmware remotely, making it a convenient and less intrusive option. Follow the instructions on the Cloudcutter GitHub repository to use this method for flashing your 6910HA device.
Use profile 1.1.9 bk7231s_common_iot_config_ty

Swap chip

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. There's a useful guide to disassemble and serial flash these switches on Mike McGuire's blog. After that, you can use ESPHome's OTA functionality to make any further changes.

ESP-Based Pinout

Pin	Function
GPIO1	UART TX
GPIO3	UART RX
EN	10k pull-up
RES	10k pull-up
GPIO15	10k pull-down

BK72XX-Based Pinout

Pin	Function
RX1	Tuya Rx
TX1	Tuya Tx

Dimmer Configuration

The dimmer requires the Tuya MCU and will expose 4 datapoints

1. = Switch
2. = Dimmer setting 0-1000 This is the light setting
3. = Min Dimmer setting 0 - 1000 When pressing the button this is the lowest the dimmer will go to
4. = Countdown timer in seconds to turn off the light ie 600 = 10Min

substitutions:
  device_name: detadimmerwitch
  friendly_name: "Dimmer Switch"

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

esphome:
  name: ${device_name}
  friendly_name: ${friendly_name}

# ESP-Based Board
#board: esp01_1m
#esp8266_restore_from_flash: true

bk72xx:
  board: wb3s

# disable logging over UART
logger:
  baud_rate: 0

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "${device_name} Fallback"
    password: "12345678"

api:
  encryption:
    key: !secret api_encryption_key

ota:
  - platform: esphome
    password: !secret ota_password

# The web_server & sensor components can be removed without affecting core functionaility.
web_server:
  port: 80

#################################
captive_portal:

# espsetup
#uart:
#  rx_pin: GPIO3
#  tx_pin: GPIO1
#  baud_rate: 9600

uart:
  rx_pin: P10
  tx_pin: P11
  baud_rate: 9600

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

# 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_datapoint: 3
    min_value: 0
    max_value: 1000

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