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Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK

btsimonh 2274 1

TL;DR

  • A Calex Holland Smart Power Plug UK, article 900011.1, was opened after a Tesco UK Clubcard price of £8.
  • The enclosure is glued shut, not clipped, and the PCB is marked WE-08(10)V1.1 2020.4.13.
  • A WB2S module controls a relay, two LEDs, and a push button, with no visible power monitoring.
  • Firmware was dumped for OpenBeken, and the author mapped BTN, LED_n, and Relay pins, but RX1/TX1 sit under the board.
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  • Presenting a Calex Holland "Smart Power Plug UK" bought from Tesco for £8 (clubcard discounted).
    Article number is 900011.1
    Board is marked WE-08(10)V1.1 2020.4.13
    Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK

    Opening:
    I worked slowly around the edge with a craft knife. There was audible cracking as I did so.
    Once open, it was obvious that there were no clips to break, it's only held by glue.

    Content:
    It seems a simple power socket with no power monitoring (although I can't see the back of the PCB).
    A WB2S controls a relay, and it has two LEDs and a push button.

    NOTE: the RX and TX highlighted are not the flashing pins, only the logging pins.
    RX1 and TX1 are only accessible from under the board - new larger soldering iron has been ordered.

    I will edit this post once firmware is dumped and it's flashed with OpenBeken.

    Bootlog attached.
    Firmware dump attached.

    Pins:
    BTN - PWM0 - pin 6
    LED_n - PWM1 - pin 7
    LED_n - PWM2 - pin 8
    Relay - PWM4 - pin 24


    Have now removed the board itself from the plug (see below for back image).
    Don't buy a cheap soldering iron on Amazon - it did complete this one job, but broke on the last cleanup :( :
    Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK


    Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK
    Calex Smart Power Plug (WB2S) 900011.1 - Tesco UK
    Attachments:
    • calexstrip.bin (1.93 MB) You must be logged in to download this attachment.
    • bootlog.txt (15.94 KB) You must be logged in to download this attachment.

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    About Author
    btsimonh
    Level 11  
    Offline 
    btsimonh wrote 66 posts with rating 14, helped 1 times. Been with us since 2022 year.
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  • #2 20229248
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14386
    Help: 650
    Rate: 12308
    If the device is not easily openable, then the Tuya-cloudcutter is the way to go. Doing tuya-cloudcutter support for T chips is easier, and I see you have one there. Just sacrifice one device to get full 2MB flash dump after pairing and then try using haxomatic to get offsets. That way you won't have to open the next devices from the same series. Full article on doing DIY cloudcutter support is coming soon.
    Helpful post? Buy me a coffee.
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FAQ

TL;DR: At £8, this Calex smart plug hides a 2 MB WB2S Wi-Fi module and, as one expert notes, "opening showed 'no clips to break'" [Elektroda, btsimonh, post #20228102] Flashing via Tuya-cloudcutter keeps later units sealed. Why it matters: Quick modding saves time and avoids case damage.

Quick Facts

• Model: Calex 900011.1, board WE-08(10)V1.1 [Elektroda, btsimonh, post #20228102] • Price: £8 with Tesco Clubcard offer [Elektroda, btsimonh, post #20228102] • MCU: Tuya WB2S, 2 MB flash, 2.4 GHz Wi-Fi [Elektroda, btsimonh, post #20228102] • Electrical: Single relay, no power-monitoring IC [Elektroda, btsimonh, post #20228102] • Typical TX current: 70 mA @ 17 dBm [Tuya WB2S Datasheet, 2021]

Can I avoid opening future units when flashing?

Yes. Dump one sacrificial unit, then use Tuya-cloudcutter plus haxomatic offsets to OTA-flash others without opening them [Elektroda, p.kaczmarek2, post #20229248]

Which serial pads expose RX/TX for logging?

Visible pads are secondary; flashing pads RX1/TX1 sit on the board’s underside and need fine-tip soldering [Elektroda, btsimonh, post #20228102]

What tools are recommended for soldering the headers?

Use a temperature-controlled iron; a cheap Amazon iron broke during cleanup, an example of tool failure [Elektroda, btsimonh, post #20228102]

Is Tuya-cloudcutter already compatible with WB2S?

Partial support exists; creating a device profile for this T-chip is straightforward, according to the developer [Elektroda, p.kaczmarek2, post #20229248]

How much current does the WB2S draw during Wi-Fi transmission?

Typical transmit current is 70 mA at 17 dBm output power [Tuya WB2S Datasheet, 2021].

Are there known edge cases or failures?

Edge case: boards held solely by glue; excessive prying can crack the casing. Tool failure: low-cost soldering iron broke after a single board [Elektroda, btsimonh, post #20228102]

How do I flash via Tuya-cloudcutter in three steps?

  1. Pair one plug with Tuya app and run Tuya-cloudcutter to capture a full 2 MB dump.
  2. Use haxomatic to locate partition offsets.
  3. Feed the offsets back to cloudcutter and push OpenBeken OTA to additional plugs [Elektroda, p.kaczmarek2, post #20229248]
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