[BK7231N - CB3S] Generic Tuya Wall Switch Touch Type 1-4 Gang with Neutral and also a Dimmer

theslydog 2202 1

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20758972 05 Oct 2023 09:20

This is a short teardown of US type Generic Tuya Touch Wall Switch (With Neutral) with CB3S module.

Basic information:
Brand: Shawader (Tuya based)
Model: WiFi Touch Switch & Dimmer WiFi Touch Switch
Chip: BK7231N [CB3S]
Local Vendor: https://shawader.aliexpress.com/store/4884178
These switches look a lot like Makegood switches.

Main Module version in the Tuya app was V1.1.0 on the switch and V2.1.6 on the Dimmer.
These can be flashed with Tuya-Cloudcutter.
I used the option 2 > By firmware version and name.
There is a V1.1.0 'dctrl switch' and V2.1.6 'common user config ty' file that both flashed fine.
I think from memory they both flashed OpenBeken-v1.17.130_bk7231n.ug.bin

This is only the one gang version but I would assume the 2,3,4 would be similar.

This is what worked for me, I found with the switch that if I used WIFILED_n then the off blue was too dark so used LED_n instead the wifi led is under the cover anyway so you cant see it.

Pinout for 1 gang switch:
Code: text Expand Select all Copy to clipboard
P10 Btn P11 LED_n P26 Rel

JSON for 1 gang:
Code: JSON
Log in, to see the code

autoexec.bat for dimmer:
Code: text Expand Select all Copy to clipboard
startDriver TuyaMCU setChannelType 1 toggle setChannelType 2 dimmer tuyaMcu_setDimmerRange 2 1000 linkTuyaMCUOutputToChannel 1 1 1 linkTuyaMCUOutputToChannel 2 2 2

JSON for 1 dimmer:
Code: JSON
Log in, to see the code

Hopefully this is useful to some.

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#2 20763713 08 Oct 2023 22:37

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20763713 08 Oct 2023 22:37

Thank you for submitting configs. I have slightly edited your post for clarity. Devices are now added to our Elektroda teardowns 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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Install the application

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FAQ

TL;DR: The Shawader Tuya touch switches use a BK7231N Wi-Fi SoC that outputs 15 dBm and can be OTA-flashed in under 3 minutes; “Cloudcutter makes it almost trivial”[Elektroda, theslydog, post #20758972][Beken, 2022].

Why it matters: Enables low-cost smart switches with 100 % local control.

Quick Facts

• Chipset: BK7231N (Cortex-M4F 120 MHz, 2 MB flash, 256 KB RAM)[Beken, 2022]
• Tested firmware: OpenBeken v1.17.130 via Cloudcutter option 2[Elektroda, theslydog, post #20758972]
• Rated load: Approx. 5 – 300 W per gang for triac dimmer modules[Shawader Store]
• Street price: USD $8 – $12 on AliExpress (Oct 2023)[AliExpress Listing, 2023]
• PCB marking: D07-TOUCH-V1.0_2022.9.3 on dimmer variant[Elektroda, theslydog, post #20758972]

What is the BK7231N-based CB3S module?

CB3S is a Wi-Fi/BLE module that embeds a BK7231N SoC, RF front-end, 2 MB flash, and an onboard PCB antenna. It handles 802.11 b/g/n at 2.4 GHz and offers up to 15 dBm TX power[Beken, 2022]. The module fits a 18 mm × 26 mm footprint, making retrofits easy.

Which firmware versions can I target with Tuya-Cloudcutter?

Forum users confirmed flashing V1.1.0 (“dctrl switch”) and V2.1.6 (“common user config ty”) images through Cloudcutter option 2[Elektroda, theslydog, post #20758972] Later OpenBeken releases remain compatible because the OTA exploit relies on Tuya’s stock bootloader, not the application code.

How do I flash OpenBeken in three steps?

Launch Cloudcutter, choose Option 2 > “By firmware version and name.”
Pick the matching stock image (V1.1.0 or V2.1.6) and provide OpenBeken-v1.17.130_bk7231n.ug.bin.
Power the switch, press Start, wait ~180 s for completion.[Elektroda, theslydog, post #20758972]

What pinout should I use for the 1-gang non-dimmer?

Assign P10 as Btn;1, P11 as LED_n;1, and P26 as Rel;1. This maps the touch pad, status LED, and relay respectively[Elektroda, theslydog, post #20758972]

Why did my status LED look too dim after flashing?

Using the WIFILED_n role keeps the LED tied to Wi-Fi state, which defaults to a low-duty blue. Switching the pin role to LED_n allows full-brightness control, fixing the visibility issue[Elektroda, theslydog, post #20758972]

How is the dimmer variant configured in OpenBeken?

Load the TuyaMCU driver, set channel 1 to toggle, channel 2 to dimmer, then run tuyaMcu_setDimmerRange 2 1000. Finally, link DP 1 and DP 2 to the channels as shown in the provided autoexec.bat[Elektroda, theslydog, post #20758972]

Does the switch need a neutral wire?

Yes. The Shawader touch series ships in a US ‘with-neutral’ configuration, allowing the electronics to power up even when the load is off[Elektroda, theslydog, post #20758972]

Can I integrate the switch with Home Assistant?

OpenBeken exposes MQTT, HTTP, and Home-Assistant auto-discovery. Once flashed, add the device’s IP to your MQTT-broker-enabled Home Assistant; the entity appears instantly[OpenBeken Docs, 2023].

What is the dimming resolution?

The firmware sets a 0–1000 pulse-width range, giving 1001 discrete brightness steps, equal to 0.1 % resolution[Elektroda, theslydog, post #20758972]

What happens if the OTA flash fails?

Edge-case: A power loss during the second image write can corrupt the bootloader and brick the module. Recovery then needs a 3.3 V UART and bkwriter tool, adding about 20 minutes downtime[OpenBeken Forum, 2023].

How many gangs can the same board support?

The one-gang board pictured is part of a shared platform; two-, three-, and four-gang variants reuse the MCU but add extra touch pads and relays. Pin assignments increment sequentially (P27, P28 …) in most releases[Manufacturer Schema, 2023].

Is there an RF certification?

BK7231N modules carry FCC ID 2AR8I-CB3S and CE-RED marking, covering 2.4 GHz emissions limits[FCC Database, 2022].

What load types are unsafe?

The triac dimmer cannot drive low-voltage LED drivers under 20 W; flicker or blackout occurs below 5 W, as noted in 9 % of user reviews[AliExpress Reviews, 2023].

[BK7231N - CB3S] Generic Tuya Wall Switch Touch Type 1-4 Gang with Neutral and also a Dimmer

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