[BK7231N/CB3S] Tuya Smart Life LED Wireless Controller (single colour PWM)

This is a $7 LED controller that I got from aliexpress.



Opening it up revealed that it uses a CB3S/BK7231N module.



As I was not in the mood to try desoldering the module, or to solder additional attachments to the board, I checked if the TX/RX pins are available on the debug pins to the side. This sadly was not the case - only VCC and GND were broken out there. However, it turns out that I have a pogo mini clamp laying around that kind of fit on the rx/tx pins of the CB3S - and I used some probe clips to attach to GND/VCC.



Even though this looks a bit adventurous - this approach worked fine, and flashing worked without any problems.

If you want to replicate this - the black probe clip (rightmost debug connector) is GND, the red one next to it is VCC (3.3V). Only the two left probe clips are used; they attach to pin 15 (RXD) and 16 (TXD) of the CB3S; 16 is the pin closest to the antenna.

After flashing, PIN 26 is the PWM pin for the LED strip. I did not yet try the remote (I don't really need it for my current use-case).

Hello, can you paste here a JSON template from OBK Web App?

Hi,

This is the JSON from the web app. I tried filling it out, but was not sure what to put into some of the fields. Please let me know if you need anything else.

Thank you, I've added this device to our teardowns/templates list.

Added after 6 [minutes]:

Btw, can you also attach config partition so I can check which pin is used for IR?
See guide:
https://www.youtube.com/watch?v=WunlqIMAdgw&ab_channel=Elektrodacom

Hi,

here is the config partition dump as a JSON:



Towards the end, it looks like some things might get a bit confused (fac_pin, etc). I also do have a full firmware backup, if that might be helpful.

Please let me know if there is anything that I can help with