What Wi-Fi module is inside the Aubess 2-gang mini smart switch?
The board carries a Tuya CB2S module populated with a BK7231N Wi-Fi/BLE SoC, visible on the PCB silkscreen and confirmed by the poster [Elektroda, omelchuk890, post #20325250]
Aubess 2gang Mini Smart Switch BK7231N /CB2S
TL;DR
- An Aubess 2gang Mini Smart Switch based on BK7231N/CB2S is converted to OpenBK7231N firmware.
- The flash uses hid_download_py uartprogram from a TTL-USB adapter, with CEN briefly shorted to GND to trigger read and write mode.
- The example uses Python 3.8.10, com35, and a 0x200000 backup size before writing OpenBK7231N_QIO_1.15.149.bin.
- Backup and reflashing complete, but the CEN-to-GND step can fail and may require several attempts.
A regular device from Aliexpress, bought on sale in November, decided to redo it now.
For firmware, I use the ESP-01 firmware module with a piece of soft cable from the keyboard.
Installing python, for W7 the latest version is 3.8.10
https://www.python.org/downloads/windows/
When installing, note Add python 3.5 to PATH.
Next, go to https://github.com/OpenBekenIOT/hid_download_py
Green "CODE" button, Download ZIP.
I moved the archive to the root of the system disk I have, unpacked it, renamed it to hid_download_py, deleting the text "-master".
There should be no attachments, i.e. by opening C:\hid_download_py there should be files and several folders at once.
We go to the address https://github.com/openshwprojects/OpenBK7231T_App/releases
Download the file BK7231N -> UART Flash-> OpenBK7231N_QIO_x.xx.xx.bin
I created the folder BK7231 in the root of disk E, transferred the downloaded file to it.
It remains to flash.
Running the command line cmd.exe
Going to the root of the disk: cd\
I go to the directory with the program: cd hid_download_py
By this point, it is already necessary to know which port number the TTL-USB converter has.
I read the firmware, I have com-port35, with the command: python uartprogram backup_2mb_default_02_switch_2ch.bin -d com35 -r -l 0x200000
After pressing "enter", I briefly connect CEN and GND, the firmware is read and the file specified in the command is created in the hid_download_py folder.
The connection of CEN to gnd should be short-lived, casual. It may take several workouts and still won't work the first time.
After reading, we load the necessary file with the command: python uartprogram E:\BK7231\OpenBK7231N_QIO_1.15.149.bin --unprotect -d com35 -w --startaddr 0x0
where E:\BK7231\OpenBK7231N_QIO_1.15.149.bin the path to the file and its name.
the procedure with CEN is the same as when reading.
Pin assignment
P6 - Lout1
P7 - Lout2
P10(RX) - S1
P11(TX) - S2
P24 - led
P26 - button
For firmware, I use the ESP-01 firmware module with a piece of soft cable from the keyboard.
Installing python, for W7 the latest version is 3.8.10
https://www.python.org/downloads/windows/
When installing, note Add python 3.5 to PATH.
Next, go to https://github.com/OpenBekenIOT/hid_download_py
Green "CODE" button, Download ZIP.
I moved the archive to the root of the system disk I have, unpacked it, renamed it to hid_download_py, deleting the text "-master".
There should be no attachments, i.e. by opening C:\hid_download_py there should be files and several folders at once.
We go to the address https://github.com/openshwprojects/OpenBK7231T_App/releases
Download the file BK7231N -> UART Flash-> OpenBK7231N_QIO_x.xx.xx.bin
I created the folder BK7231 in the root of disk E, transferred the downloaded file to it.
It remains to flash.
Running the command line cmd.exe
Going to the root of the disk: cd\
I go to the directory with the program: cd hid_download_py
By this point, it is already necessary to know which port number the TTL-USB converter has.
I read the firmware, I have com-port35, with the command: python uartprogram backup_2mb_default_02_switch_2ch.bin -d com35 -r -l 0x200000
After pressing "enter", I briefly connect CEN and GND, the firmware is read and the file specified in the command is created in the hid_download_py folder.
The connection of CEN to gnd should be short-lived, casual. It may take several workouts and still won't work the first time.
After reading, we load the necessary file with the command: python uartprogram E:\BK7231\OpenBK7231N_QIO_1.15.149.bin --unprotect -d com35 -w --startaddr 0x0
where E:\BK7231\OpenBK7231N_QIO_1.15.149.bin the path to the file and its name.
the procedure with CEN is the same as when reading.
Pin assignment
P6 - Lout1
P7 - Lout2
P10(RX) - S1
P11(TX) - S2
P24 - led
P26 - button
Comments
The WiFI module here is interesting. I can see label: FL_M99_V3 . Is it the same as WB2S? https://obrazki.elektroda.pl/8033213800_1670515967_thumb.jpg [Read more]
there is a marking on the back of the module cb2s, BK7231N [Read more]
Ah, sorry, so it's N and not T. That's good to know. Oh indeed, I can see a small CB2S marking on the back of the module. Hmm. That's interesting. btw FL_M99_V1 was supposedly BL2028N : https://obrazki.elektroda.pl/7543870900_1670516755_thumb.jpg... [Read more]