Exploring & Flashing Aoycocr PWM E14 candle bulb with surprise/unknown Tuya module - WB9/BK7231T

Picked up these two E14 candle bulbs from the HaveDeer store on Ali Express. A single box with two identical units branded as Aoycocr. 5W RGBCW 400lm E14 candle bulbs with model Q2SC2M.

https://www.aliexpress.com/item/1005005961852651.html



Some packaging and device exterior shots:


The plastic candle dome top pops off very easily to reveal an LED disc with true separate CW LEDs, single RGB combined LEDs and an 8 pin connector. With this number of pins I assumed it would be a PWM bulb rather than an i2c chip-based device.



Diving deeper I found a module I've never seen before and one that does not show in any forum/Discord or Google searches that I can see. I don't see it listed in Tuya's dev product list either. It has an unshielded BK7231T. The whole module is rather large and labelled as "WB9". It is soldered to the main PCB by two columns of 4 pins at either side.



I unsoldered the module from the riser pins.



I then soldered VIN and GND holes to 3.3V and GND and attempted to power on the device but there was no life. I soldered power instead to the 3V3 pad and the chip booted as normal. I could pair it with the Tuya app.



Using pogo pin from USB-TTL to TXD2 I got this boot log. Note how old the SDK and build date is. Tuya-cloudcutter can be used on this.


and then with the RXD1 and TXD1 I dumped the flash, attached.



Easy flasher extracted this config


Interesting the module in storage data is WB3S

JSON


Tuya API


Flashing with OBK for the BK7231T was a success first time at 1500000 baud using pogo pins, perhaps thanks to the excellent contact they had with the test pad holes - the probes sat right in the middle of them perfectly.

Some more pics of the main PCB



Interesting there's "12V" silkscreen text. Maybe the WB9 module is 12v through the VIN pin but reduces to 3.3v on the module for the BK7231T. There is a JWH6J chip and quite a few other bits on the module itself. On the main PCB there's an MB6F and under one of the capacitors a KP3210BSG.

So I have no information about the WB9, but am glad all the test pads were labelled nicely and it seems to be a standard BK7231T that's fully compatible with OBK. Could this be an Elektroda showcase world first for the WB9 module?

OBK template:



https://github.com/OpenBekenIOT/webapp/pull/9...mits/2fb0d7e7e6eab1c7b482f28d4c7e70592950f7c7

At first it looked like WBL9C:

but indeed, that's not WBLC9, it's a totally new module. Great find! Thank you for sharing.
I've also tried searching for information and I only found:
https://www.tuyaos.com/viewtopic.php?t=2994
It's a small world.

p.kaczmarek2 wrote:

It's a small world.

indeed. I'm still hoping for a reply. I want info!

WB9 seems to have 5 transistors on itself, so it is most likely a dedicated solution for lighting. Maybe it's not a fully oficial Tuya module.

p.kaczmarek2 wrote:

Maybe it's not a fully oficial Tuya module.

might not be Tuya, true. There isn't the usual Tuya logo or even Tuya text on the box. I've emailed Shenzhen RiShengHua Technology Co., Ltd (RSH-TECH Company Limited.,) who are referenced on the sticker.

It depends on what do you mean by "Tuya". I don't even know myself how it works exactly, but SmartLife seems to be Tuya as well, and they are all using Tuya SDK. Futhermore the JSON you extracted is in the Tuya format as far as I know and the JSON content indicates Tuya. It seems like all those new "brands" of smart products are just using Tuya under different logos

TCP Smart branding in the UK uses tuya servers as well. I believe so does energizer (at least in the past they did)

Tuya is very open for integrations, they even have SDKs for multiple chips (like the ones we are using for OBK)