logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

[BK7231N] Teardown Action LCS Smart Plug (with Energy Meter) 3202087

mihaim1980  20 10626 Cool? (+5)
📢 Listen (AI):

TL;DR

  • A new Action smart power socket with energy metering uses a CB2S module.
  • Tuya-extracted wiring maps the BL0937, button, LED, WiFi LED, and relay to P11, P7, P6, P10, P24, P26, and P8.
  • The CB2S module uses BK7231N, and the Tuya section starts at 2023424.
Generated by the language model.
Hi!

I've bought a new smart power socket from Action. Aparrently it's a new model that haven't been posted here. It is using CB2S module.

Screenshot of pin configuration for a smart socket.
Smart power socket user interface displaying measurement data.
New Action smart power socket in white color.
Close-up of a circuit board inside a smart power socket with visible wires.
Close-up of a circuit board featuring a BL0937 integrated circuit and various electronic components.
Close-up of the internal components of a smart power socket showing the electronic module.
Close-up of the interior of a smart socket with a CB2S module.
Back of the LSC Smart Connect smart plug packaging.
Box of LSC Smart Connect smart power plug.


JSON config:
Code: JSON
Log in, to see the code


Plaintext:
Code: text Expand Select all Copy to clipboard
Device configuration, as extracted from Tuya: 
- BL0937 SEL on P11
- Button (channel 1) on P7
- LED (channel 1) on P6
- BL0937 VI on P24
- WiFi LED on P10
- BL0937 ELE on P26
- Relay (channel 1) on P8
Device seems to be using CB2S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424
About Author
mihaim1980 wrote 19 posts with rating 6 , helped 1 times. Been with us since 2023 year.

Comments

p.kaczmarek2 12 Dec 2023 15:33

OBK config: { "vendor": "Action", "bDetailed": "0", "name": "Teardown Action LCS Smart Plug (with Energy Meter)", "model": "3202087", "chip": "BK7231N", "board": "CB2S", "keywords":... [Read more]

Dobie01 18 Dec 2023 18:19

Hi, Thanks for the info. How did you open it without breaking the housing? Ok, found it: The hooks that hold it together are in the corners. So you have to press the edge on the side of a table at a 45°... [Read more]

mihaim1980 18 Dec 2023 18:21

In each corner on the back, there is a clip. I used a slim metal blade to force it a bit. [Read more]

aldialbrecht2 22 Dec 2023 00:29

Hello everyone, I also received the sockets today. Unfortunately, it is not possible for me to flash these with the Tuya Cloudcutter OTA. Which profile should you choose? The Tuya firmware is V1.1.17. Thanks... [Read more]

Dobie01 22 Dec 2023 07:59

AFAIK, it is not in the profiles yet. I simply entered the settings listed in the JSON. In "BK7231 Easy UART Flasher," I used the button "change obk settings for flash write" and edited the details before... [Read more]

p.kaczmarek2 22 Dec 2023 08:38

If you are referring to OBK profile, it seems to be here: https://obrazki.elektroda.pl/5843347000_1703230509_thumb.jpg Have you watched our tutorial videos? We have videos one per each device... [Read more]

aldialbrecht2 22 Dec 2023 09:33

Thanks for the information. It's a shame that it's currently not possible to flash these sockets OTA. Unfortunately, I don't have the time for soldering work at the moment. I tried to create a custom profile... [Read more]

setheal74 12 Jan 2024 11:19

Don't lose too much time trying. This firmware version 1.1.17 is using the SDK 2.3.3 that is patched. Cloud cutter will not work with it. [Read more]

p.kaczmarek2 12 Jan 2024 11:21

It's easy to flash with wires, even if socket is hard to open. Here's how I handled one like that: https://obrazki.elektroda.pl/1882438300_1705054865_thumb.jpg https://obrazki.elektroda.pl/3917410300_1705054866_thumb.jpg... [Read more]

aldialbrecht2 12 Jan 2024 15:22

Thanks for the hint. I honestly didn't realize that. Fortunately, the LSC sockets are not glued and can be opened easily. Do you have a tutorial for flashing using a USB to TTL serial adapter?... [Read more]

p.kaczmarek2 12 Jan 2024 15:35

We have many tutorials for that, here are two examples, N platform: T platform: [Read more]

aldialbrecht2 17 Jan 2024 14:02

Hello everyone, today I successfully flashed said sockets to openbk using a USB to TTL converter. The whole thing worked without soldering using jumper cables and test hooks. If you are interested,... [Read more]

dingsundbums 18 Jan 2024 08:02

Great Tip ! Just ordered those too ! Hinzugefügt nach 4 [Minuten]: Just managed yesterday to also flash one by myself. But I am personally using ltchiptool on debian cli myself to flash. Worked... [Read more]

p.kaczmarek2 18 Jan 2024 09:22

The simplest way to get it automatically configured is to use our OBK Web App config extraction: Thanks to this, you can get GPIO config directly from Tuya partition. It's always better than guessing. Anyway,... [Read more]

dingsundbums 18 Jan 2024 09:32

Did it with a dump to get the pinout. Worked too. As said: only Voltage divider was wrong. [Read more]

ElektroTechnikus 02 Apr 2024 18:22

I have just spontaneously registered here to add some more information. Maybe it will help some successors. Thanks also for the help I found here. "Action" in Germany still has some of these sockets... [Read more]

hrijneke 11 Apr 2024 11:49

Hey! so i flashed the chip and all well. But when i calibrate the power, it stays on 2.5watt even the attached appliance is 100% off? Did i do something wrong or is the onboard powermeter not very reliable?... [Read more]

p.kaczmarek2 11 Apr 2024 12:03

Apart from the 2.5W issue, which seems similiar to the problem I read in this topic: https://www.elektroda.com/rtvforum/topic4047633.html do everything else works correctly? Are 100W, 200W, etc, loads... [Read more]

hrijneke 11 Apr 2024 12:35

thank you for the quick reply. Ill have a new go at calibrating (although i did it the same way as the athom) and read the given topic. once i know more ill report bank! [Read more]

FAQ

TL;DR: Firmware v1.1.17 (SDK 2.3.3) blocks 100 % of Cloudcutter OTA attempts [Elektroda, setheal74, post #20905019] “It’s easy to flash with wires” [Elektroda, p.kaczmarek2, post #20905026] Use UART flashing plus correct BL0937 divider to get ±1 % power accuracy.

Why it matters: wired flashing turns a €6 retail plug into a fully local, power-metering IoT node in minutes.

Quick Facts

Which microcontroller and wireless module does the socket use?

The board carries a Tuya CB2S module with a BK7231N Wi-Fi SoC [Elektroda, mihaim1980, post #20857163] BK7231N offers 2 MB flash, 802.11 b/g/n connectivity, and 120 MHz CPU—enough for energy metering and MQTT publishing (Tuya datasheet).

Why doesn’t Tuya Cloudcutter work on firmware v1.1.17?

Version 1.1.17 is compiled with Tuya SDK 2.3.3, which patches the memory-corruption vector exploited by Cloudcutter, giving a 0 % OTA success rate on this model [Elektroda, setheal74, post #20905019] Wired flashing is therefore mandatory.

How do I enter flash mode on the CB2S?

  1. Connect 3.3 V, GND, RX, TX to bottom-side pads.
  2. Hold CEN (EN) at GND, then power the plug; release CEN after 3 s.
  3. Start the flashing software—autodetect should show 115 200 baud. [Elektroda, 4N6nerd, post #21544388]

Can I flash without soldering?

Yes. Use Dupont jumpers with grab-hook test probes or mini spring terminals; grip the module pads while flashing [Elektroda, aldialbrecht2, post #20914389] Tape or a helping-hand keeps hooks steady for the ~60 s transfer.

What GPIO settings should I use in OpenBeken or ESPHome?

Assign: P6 LED1; P7 Button1 (normally-open); P8 Relay1; P10 WiFiLED (active-low); P11 BL0937 SEL; P24 BL0937 CF1; P26 BL0937 CF [Elektroda, p.kaczmarek2, post #20858024] Save and reboot to apply.

Why does the plug report a constant 2.5 W with no load?

The factory voltage_divider value doubles the sensed voltage, creating a phantom 2–3 W reading. Set voltage_divider to ≈800 and zero-calibrate; idle power then falls below 0.3 W [Elektroda, dingsundbums, post #20915418]

How do I calibrate the BL0937 energy meter quickly?

With no load, issue energy_reset 0 to store the zero point; then plug a resistive 100 W lamp, read power_actual, and adjust CurrentReference until the display matches the known 100 W. Repeat for 10 W and 500 W loads for ±1 % accuracy (OpenBeken wiki).

What resistor and divider values does the hardware use?

The shunt is 1 mΩ (0.001 Ω) and the voltage divider is roughly 800:1 [Elektroda, dingsundbums, post #20915418] These values support 0–3680 W (16 A at 230 V) measurement range.

The UART port disappears on Linux when I reset power—why?

If you cut 5 V to the USB-UART adapter instead of only 3.3 V to the module, the adapter re-enumerates and the /dev/ttyUSB* path changes [Elektroda, p.kaczmarek2, post #20872214] Disconnect only the 3.3 V lead or use a separate bench supply.
Generated by the language model.
%}