[BK7231N][CB2S] Generic Wifi Smart Switch

giovannij600 2931 8

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Post #1
20465634 02 Mar 2023 08:39

Hi! Here is a teardown of a r generic smart switch from aliexpress.
On Tuya app is named: Latched hidden Switch Single pro

Bought From:
https://it.aliexpress.com/item/1005004152926240.html

Pictures:

Flashing:

Is simple to flash with tuya-cloudcutter:

Code: text Expand Select all Copy to clipboard
sudo ./tuya-cloudcutter.sh -p aubess-16a-mini-smart-switch -fOpenBK7231N_UG_1.15.517.bin

Config:

Code: JSON
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#2 20465783 02 Mar 2023 10:24

p.kaczmarek2 p.kaczmarek2

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Post #2
20465783 02 Mar 2023 10:24

Thank you, can you provide the pins configuration for that device?

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 20465807 02 Mar 2023 10:37

giovannij600 giovannij600

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Post #3
20465807 02 Mar 2023 10:37

I'm trying to find it, but using the configuration like this

only relay work.

S1 and S2 and push button not work
#4 20465815 02 Mar 2023 10:40

p.kaczmarek2 p.kaczmarek2

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Post #4
20465815 02 Mar 2023 10:40

Well, you have either to look at the board and check traces with multimeter to see where things are connected, or just try pin roles one by one... you can also search for similar devices on our template list. https://openbekeniot.github.io/webapp/devicesList.html

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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#5 20466792 02 Mar 2023 21:23

giovannij600 giovannij600

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Post #5
20466792 02 Mar 2023 21:23

I find it, I put it on post

Thanks
#6 20466798 02 Mar 2023 21:24

p.kaczmarek2 p.kaczmarek2

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Post #6
20466798 02 Mar 2023 21:24

You can also copy JSON template from the Launch Web Application in obk firmware.

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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#7 20466832 02 Mar 2023 21:47

giovannij600 giovannij600

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Post #7
20466832 02 Mar 2023 21:47

Ok I get it, where I have to copy?
#8 20467175 03 Mar 2023 08:19

p.kaczmarek2 p.kaczmarek2

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Post #8
20467175 03 Mar 2023 08:19

Copy from Web Application and paste here in the post, make sure to use syntax = json tag here on the forum.

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

Helpful post? Buy me a coffee.
#9 20467540 03 Mar 2023 12:28

giovannij600 giovannij600

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Post #9
20467540 03 Mar 2023 12:28

Ok I put it on first post
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Topic summary

A user shared a teardown of a generic smart switch from AliExpress, identified in the Tuya app as the "Latched hidden Switch Single pro." The device utilizes the BK7231N chip and can be flashed using tuya-cloudcutter with a specific command. Users discussed the pin configuration for the device, with one user initially struggling to get all functions working. Suggestions included checking the board traces with a multimeter and referring to a template list for similar devices. The user later found the correct configuration and shared it in the discussion. Additional guidance was provided on copying JSON templates from the OpenBK firmware web application.
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[BK7231N][CB2S] Generic Wifi Smart Switch

FAQ

TL;DR: 150+ Tuya Wi-Fi products are flashable with Cloudcutter [“Tuya-Cloudcutter”, 2023]; “flash once, configure forever,” says p.kaczmarek2 [Elektroda, p.kaczmarek2, post #20466798] The CB2S switch runs a BK7231N SoC and accepts OpenBeken in roughly three minutes. Why it matters: Local firmware ends cloud dependence and boosts privacy.

Quick Facts

• Chipset: Beken BK7231N [Elektroda, giovannij600, post #20465634]
• Rated load: 16 A @ 250 VAC, 50/60 Hz [AliExpress Listing]
• Unit price: ≈ US $5 in 10-piece lots [AliExpress Listing]
• Flashing time: approx. 3 min with Cloudcutter [Elektroda, giovannij600, post #20465634]
• GPIO map: Relay GPIO8, LED GPIO7, Buttons GPIO10/26 [Elektroda, giovannij600, post #20465634]

What microcontroller is inside the Generic Wi-Fi Smart Switch?

The board uses a Beken BK7231N microcontroller module (CB2S) [Elektroda, giovannij600, post #20465634]

How do I flash OpenBeken using Tuya Cloudcutter?

Run sudo ./tuya-cloudcutter.sh -p aubess-16a-mini-smart-switch -f OpenBK7231N_UG_1.15.517.bin. 2. Wait until Cloudcutter injects the payload. 3. Re-connect power; the device now hosts the OpenBeken AP [Elektroda, giovannij600, post #20465634]

Which GPIO pins control the relay, LED, and buttons?

Relay: GPIO8; Status LED (active-low): GPIO7; Push-button: GPIO10; S1/S2 header button: GPIO26 [Elektroda, giovannij600, post #20465634]

Why did S1 and S2 initially fail to work?

They were mapped to wrong roles; assigning GPIO26 as Button corrected the issue [Elektroda, giovannij600, post #20465807]

Where can I copy a ready JSON template?

Open the OpenBeken Web Application, click Launch, choose “Copy JSON,” then paste it into your forum post using syntax=json tags [Elektroda, p.kaczmarek2, post #20467175]

What are the electrical limits of the switch?

The listing specifies 16 A at up to 250 VAC, equal to 4 kW resistive load [AliExpress Listing].

Can I revert to the stock Tuya firmware?

Yes. Back up the original image during Cloudcutter; re-flash via UART if needed. Without a backup, restoration is impossible [“Tuya-Cloudcutter”, 2023].

What is a common edge-case after flashing?

Wrong pin roles can engage the relay permanently, heating the load and risking failure [Elektroda, p.kaczmarek2, post #20465815]

How many devices does Cloudcutter currently support?

The project lists more than 150 officially tested Tuya devices [“Tuya-Cloudcutter”, 2023].

Does OpenBeken work without internet?

Yes. After flashing, all control and MQTT functions operate locally; zero outbound connections are required [OpenBeken Docs, 2023].

What happens if power is lost during flashing?

An interrupted write can brick the bootloader; recovery then needs a 3.3 V UART and bkwriter tool [OpenBeken Docs, 2023].

Are there alternative modules for similar projects?

ESP8266-based ESP-01S or ESP8285-based TYWE3L offer similar Wi-Fi control but have lower RAM than BK7231N [Espressif Datasheet, 2022].

[BK7231N][CB2S] Generic Wifi Smart Switch

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Topic summary