Mapping Pins and Flashing Firmware on WB2S/BK7231T Chip from La Foir'Fouille Smart Plug

bmarchais 981 2

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Post #1
20802666 06 Nov 2023 18:24

Hello,

I've recently found this smart plug at a France store (La Foir'Fouille) for really cheap (less than 5 dollars on sale).

So I teardown the device (using a flat screwdriver and some brute force), and found the chip is a WB2S with a BK7231T. Great news!

I flash the firmware using the bk7231flasher_1.0.3 app with the latest 7231T firmware. Works great!
I follow the traces on the PCB, and after a little bit of trial and errors I successfully map the following pin :
Button PWM5
LED PWM1 (inverted !)
Relay PWM4

If you have any questions, I am at your disposal!
Happy hacking!

Cool? Ranking DIY
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bmarchais bmarchais

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#2 20803551 07 Nov 2023 11:40

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20803551 07 Nov 2023 11:40

Thanks, can you post JSON template from the Web App?

PS: I recently had to fix a similiar plug. Electrolytic capacitor had to be replaced due to the lack of enabled PowerSave 1 in OBK. So, please consider enabling PowerSave in OBK startup command. This may prolong the device life.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#3 20804505 07 Nov 2023 21:34

bmarchais bmarchais

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Post #3

20804505 07 Nov 2023 21:34

Hi,
I successfully added the command "PowerSave 1" in the startup command tab. Thanks for the info.
Here's the json :

{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Thank's smart plug",
  "model": "Thank's smart plug",
  "chip": "BK7231T",
  "board": "TODO",
  "flags": "1024",
  "keywords": [
    "TODO",
    "TODO",
    "TODO"
  ],
  "pins": {
    "7": "LED_n;1",
    "24": "Rel;1",
    "26": "Btn;1"
  },
  "command": "PowerSave 1",
  "image": "https://obrazki.elektroda.pl/2272951900_1699291211.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic4012920.html"
}

I didn't know what to put on the "keywords" value. If this is important, please let me know
Thanks !

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Button	PWM5
LED	PWM1 (inverted !)
Relay	PWM4

Mapping Pins and Flashing Firmware on WB2S/BK7231T Chip from La Foir'Fouille Smart Plug

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