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Water Boiler/Heater switch with 4 touch buttons and 20Amp relay

seeindarkness 1401 7
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    #1 20967494
    seeindarkness
    Level 4  

    Water Boiler switch with 4 touch buttons and 20Amp relay
    Markings on the board: EZS-WBA1H20C-AA_V1.4
    20211231
    Water boiler switch with four touch buttons, time markings, and a drop symbol in the center.
    Printed circuit board with electronic components and traces.
    Electronic board with markings and connection elements.
    Printed circuit board in a plastic casing with electronic components and screw terminals.
    Close-up of an integrated circuit on a printed circuit board with markings.
    WiFi boiler switch with labeled connections and technical details.

    link to item Link

    Managed to map some pins, like all the LEDS the weird Relay and one capacitance button,
    There is a mystery MCU on the board that is connected only to P28 and apparently sending high and low signals when touching 2 of the pads
    Code: JSON
    Log in, to see the code


    There is also BL0942 chip but I was unable to config it to see any packets of info from it,
    Also the relay is magnetically held.
    P24 - Relay - High to turn on
    P26 - Relay - high to turn off

    P7 also goes into the power board, no idea what it does.

    Any help will be appreciated.
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  • #2 20969785
    divadiow
    Level 35  
    did you take a backup of the factory firmware?
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  • #4 21065449
    divadiow
    Level 35  
    I'd forgotten all about this and my subconscious has since told me to buy one because it wasn't in the device list. It's now arrived but I haven't done anything but open it up.
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  • #6 21071623
    divadiow
    Level 35  
    I'm getting nothing from tuyaMcu_sendQueryState at 115200 or 9600 baud following this https://www.elektroda.com/rtvforum/topic4049908.html#21053452

    but it seemed in continuity check that two of the main PCB connector pins looked like they were going roughly in this area of the BK IC with SPI pins (I couldn't really see which pins I was touching)

    PCB connector diagram with highlighted pins 12, 13, 14.

    then I remembered there was a BL0942SPI driver. so started that

    Code: Text
    Log in, to see the code


    Screenshot displaying OpenBK_BK7231N_Boiler parameters.

    but like @uchristo device in here

    Code: Text
    Log in, to see the code


    these are seen with startdriver bl0942spi 9600 and startdriver bl0942spi 115200

    so not really sure what's next. don't know what role the MCU is playing.
  • #7 21134480
    seeindarkness
    Level 4  
    Whoa, I'm glad you bought one too, I too haven't made much progress, my guess the MCU probably is a touch controller for the buttons on the faceplate
  • #8 21134684
    divadiow
    Level 35  
    Mine's back in the box. I think I got bored of it 😬
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Topic summary

Discussion revolves around a water boiler/heater switch featuring 4 touch buttons and a 20Amp relay, identified by the board marking EZS-WBA1H20C-AA_V1.4. Users are exploring the functionality of the device, particularly the mystery MCU connected to specific pins that send signals when buttons are touched. Some participants have attempted to map pins and retrieve data from the device, including firmware backups and storage data. Issues with communication and data retrieval from the device using Tuya and BL0942SPI drivers have been reported, with users sharing their experiences and troubleshooting steps.
Summary generated by the language model.
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