logo elektroda
logo elektroda
X
logo elektroda

Configuring YG400A WiFi Smoke Detector (T1-U-HL) with OpenBeken

PitSchnass 381 3
ADVERTISEMENT
  • #1 21846089
    PitSchnass
    Level 2  
    Posts: 2
    I wanted to integrate our smoke detectors into Home Assistant (without cloud) and so I bought a bunch of the well known 'Wi-Fi Smoke detector YG400A'. I hoped I could use the configuration hints from this thread.
    But the PCB (YG400A-T A010) has another CPU T1-U-HL chip than expected.

    I found a thread in this forum with this chip and so I tried to flash the chip.
    The flash process with the 'Easy UART flasher' and this file 'OpenBK7238_QIO_1.18.263.bin' was successful.

    Wi-Fi is working and I could integrate the smoke detector into my local network.
    The configuration page looks newer than in the other thread (btn has now a second edit box, wifiled has no edit box).

    Now I need some help on how to proceed further to get the smoke detector to work.

    Configuration after original firmware backup:
    TemplateGP...config.txt (880 bytes)You must be logged in to download this attachment.

    Regards

    Close-up of a purple PCB labeled “YG400A‑T A010” with a vertical row of solder pads on the right
    Purple PCB with a large black central component and a radio module; laptop keyboard in the background.
    Screenshot of BK7231 Easy UART Flasher showing “Write success!” and flashing log output
  • ADVERTISEMENT
  • #2 21846422
    DeDaMrAz
    Level 22  
    Posts: 594
    Help: 34
    Rate: 122
    What exactly do you mean by configuration page looks different? We can certainly help but please provide more details for example did you try any of the autoexec files that are provided in that thread?
  • ADVERTISEMENT
  • #3 21846592
    PitSchnass
    Level 2  
    Posts: 2
    Hi,
    I have done everything like in the other thread (Pin assignment, autoexec.bat).

    But as you can see in the screenshot, the battery level is always 0% and also the voltage is not correct. I inserted new batteries.
    Also, I set channel 3 for the wifiled, but there is no channel 3 in the screenshot.

    Status screen “OpenBekenX_684110” showing battery level 0.00% and voltage −1.17 mV
    Pin settings table for 0–28 with dropdowns and value fields, plus a “Save pin settings” button.
  • #4 21846599
    DeDaMrAz
    Level 22  
    Posts: 594
    Help: 34
    Rate: 122
    Mechanical drawing of T1‑U‑HL PCB module, top and bottom views with dimensions and pin labels

    Technical PCB module drawing with antenna and dimensions, top and bottom views

    there are some differences between CBU and T1U modules so you'll have to compare and figure out the right pin configuration
ADVERTISEMENT