Generic Tuya WIFI Smart Socket for different countries (LSPA8)

Thank you for providing configuration template. From what I see, the device seems to be using BL0937 power metering chip.

Are you also able to provide some photos from the inside?

Photos of the inside of the Smart WIFI Switch




The next photo shows how to program the WB2S.
3.3V, GND, RX and 1RX have to be connected to the UART programmer.
Program a new firmware with the BkWrite tool.
At beginning of programming, connect CEN to GND for 1 sec to reset the BK7231T.

Important: To program the WB2S, the switch on the PCB connected to the 1RX pin of the WB2S module needs to be disconnected (because it has a pull up resistor which disturbs the programming). This can be done easily: Just "remove" the solder from the 1RX pin which connects the two PCBs so that the two PCBs are no longer connected on the 1RX pin.

Thanks, this will certainly be useful for beginners and new OBK users.

As per CEN - I usually don't do CEN, just reboot with power off/on cycle. I also usually desolder whole WB2S for that and power it from 3.3V LDO.

Regarding pull up resistor - it happens from time to time, for example, in case of that Relay, we had to remove both pull up resistor and a capacitor (used to debounce button by Tuya):
[youtube]https://wwwa.youtube.com/watch?v=0V0kaRVnk18[/youtube]

Thanks for this post! I am new to this, and used this info to get OpenBK on a similar but smaller plug. Mine is a generic 16A UK LSPA7, but the internals are similar -- WB2S and BL0937. It opened easily with a craft knife, and I had to desolder the AC power pins to remove the main board. The WB2S would not accept programming when attached to the main board, so I desoldered it altogether. I also found that 'uartprogram' failed, first with an error 'cannot set baud rate', and then (at a lower baud rate) a write error. I tried bk7231tools with an offset of 0x11000, which worked fine. The OpenBK configuration settings seem to work correctly for this device -- the LEDs, relay and power measurement all seem to be working. Thanks again!



Edit: The chip was reported as a "BK7231S_1.0.6" but I used the BK7231T firmware.

It's good that it worked out. Tell me if you need any special features, I can add them for you.

LSPA7 is not yet on our devices list, so thank you for photos, I will add them here:
https://openbekeniot.github.io/webapp/devicesList.html
If you have any other IoT devices not listed, feel free to post a separate teardown in this forum section.

OK, I will -- thanks for producing this awesome software

Hi.
Thank you very much for this post.
I have a similar plug, looks completely identical, also using CB2S.
See attached p hoto.
T tried flashing OpenBK using bk_writer1.6 and also the BK7231 Easy UART Flasher.
I can download the firmware successfully, (see attached) but the device will not come up and I am not able to find it with WiFi scanner.


Any ideas?
Thank

Hello, I have this LBP8 (Link) which has the CB2S chip
I have flashed the version 1.17.588 Chipset BK7231N and configured the same as the version with the WB2S.
Now the relay works but the power monitor shows all values as 0.
What do I have to change in the configuration?

Have you tried to do Tuya Config Extraction?


Added after 1 [minutes]:

@itzikR the WiFi will not work if you are powering device from low quality/low power power supply. Try desoldering flashing wires and run it with original circuit

Thanks, everything works!

That's good to hear. Can you post your complete template (JSON format, copy text from Web App) so we can add this device to supported devices list?

Please 😊

Here is corrected template:


Added after 5 [minutes]:

https://github.com/OpenBekenIOT/webapp/commit/5601eca445bcbe74ef197a8995af5d77fb9dc802

>>21089426
Sorry, you wanted the version for the LSPA8 CB2S, now here it is!

I have tried to modify the OBK template


Now I no longer have power monitoring, and I can no longer import the data that previously worked.

Always the same bad only switch works!
The modification is not displayed in the “Export Current Template”?

Excuse me, so what is the correct template? I am a bit confused now. Shall I change the one I uploaded?

Judging from your script, the BL0937 driver may be not running. Maybe you need to reboot your device or manually start the mentioned driver.

Yes, change because the current entry is for LSPA2 and not for LSPA8 (CB2S).
How can I start the BL0937 driver manually if reboot does not help?

This is displayed in the “Export Current Template”

Hey geni0815

This is my current configuration:



--> BL0937 pins are 7 and 8 (and not 6 and 7)

Power meter functionality is working fine.

Cheers
Maurus

Do you have the chip WB2S? I have the CB2S!
My switch works (power meter functionality) with my specifications if I import according to the video.
With the template import it does not work because probably the BL0937 driver does not start. So how do you start it manually?
A reboot did not help.

>>21092897
I have a WB2S. As far as I remember I didn't have to start the driver manually.

Hi,
I have the same socket, and I replaced the board with ESP-02S module, and flashed it tasmota, but I'm struggling with configuring the pins. At the moment I can only toggle the relay via the web UI, but the device button is not working, as well as the power monitoring. I tried to map the pins from the old board (CB2S) to the new board (ESP-02S), but tasmota don't have the same names for the pins, like BL0937SEL.

Does anyone have a working template for tasmota?

I have configured BL0937 for tasmota once in this topic:
https://www.elektroda.pl/rtvforum/topic3941251.html#gallery-27
Please check link above, it shows which pin roles I used for BL0937 communication. Keep in mind that used pin indexes may be different in case of your device.
Long story short - Tasmota has HLWBL_Sel and HLWBL_Sel_i instead of BL0937SEL.