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Converting Tuya Mini Smart Switch Unfamiliar PCB to dry contact?

royeiror 261 2
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  • Request for PCB photos and relay markings

    #1 21932299
    royeiror
    Level 2  
    Posts: 4
    I successfully followed a post here to convert a Mini Smart Switch into a dry contact, but I haven't seen this version of PCB. Does anyone have the instructions?

    Two circuit boards side by side, showing relay, capacitors, and a small push button on the underside
    The order of the contacts is the same as most others:
    L-Out, L-In, N-In, N-Out, S1, S1
    What is the exact brand/model of the Mini Smart Switch, or can you share the product link/listing you bought it from?
    TDQ0809

    CX12-01
    Can you upload clear photos of both sides of the PCB, including any printed markings, relay markings, and the area around L-Out/L-In/N-In/N-Out?
    Yes
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  • LN882HKI flash access needs RX/TX and boot pin tracing

    #2 21932482
    divadiow
    Level 38  
    Posts: 5153
    Help: 442
    Rate: 906
    looks to be a standard 2mb Lightning Semi LN882HKI chip on there. You'll need to identify where A2/A3 RX/TX trace to and also A9 (if they are routed out at all) for grounding to get it into boot mode so flash can be read/written to.

    https://github.com/openshwprojects/OpenBK7231T_App
    Screenshot showing “LN882H by Lightning Semi” with links to datasheet, flashing how-to, and tools.

    Easy Flasher supports LN882H https://github.com/openshwprojects/BK7231GUIFlashTool

    I don't see any test pads and I can't see the traces from the pins on the chip in the photo to see if they route anywhere.

    Added after 10 [minutes]:


    QFN32 pin layout diagram for Lightning Semiconductor LN882HKx with labeled pins around the package.
  • #3 21933837
    royeiror
    Level 2  
    Posts: 4
    Seems like my skills and tools are nowhere near what’s required to go this in depth. Sorry about that, I thought it could be done via software only.
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