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Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

iprak 843 2
  • The Enbrighten Plug-In Mini WiFi Smart Switch model WFD4103 is very well made device, its FCC certification can be found here.

    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

    It just has one button with a built-in LED.

    The back plate is glued and can be separated by inserting a spudger, start from opposite edge where the the button is located.
    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module
    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module



    The power pins are attached to the board but the ground pin comes out completely. This makes accessing the bottom of the chip very easy.
    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

    It uses a BK7231T WB2S module.

    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

    And can be flashed by using these 4 pins.
    Enbrighten WFD4103 WiFi Switch Teardown - BK7231T WB2S module

    For initial flashing use the UA (UART) version of the firmware for BK7231T.

    I used uartprogram for flashing.
    Code:
    python uartprogram -d com4 -w OpenBK7231T_UA_1.12.16.bin


    To configure the module use:
    * P7 = LED_n, channel=1
    * P24 = Rel, channel=1
    * P26 = Btn, channel=1

    Cool? Ranking DIY
    About Author
    iprak
    Level 2  
    Offline 
    iprak wrote 3 posts with rating 1, helped 0 times. Been with us since 2022 year.
  • #2
    p.kaczmarek2
    Level 27  
    Very nice and informative teardown. Have you considered doing a full flash memory dump (preferrably after pairing with a dummy SSID), so tuya-cloudcutter can support this device in the future? Gadget addresses can be automatically extracted in some cases, especially when the chip is T version.
  • #3
    iprak
    Level 2  
    No I did not consider that. My devices are interfaced with HomeAssistant and while it does have localTuya integration I did not like all the setup. Sorry I don't have the stock firmware any more.