[T34 BK7231N] Tuya Wifi Smart Plug: Flashing, Configuration, and Power Monitoring Options

Question

Flashed Windows BK7231GUIFlashTool release 1.15.305, update to OpenBK7231N_QIO_1.15.391 (release version) P10 -> TX (TTL) P11 -> RX (TTL) 3.3 -> 3.3 (TTL) GNG -> GND (TTL) CEN -> GND (TTL ) Configured: Wi-Fi Led, Led, Buttom power ON/OFF & power monitoring Option #1 - Wi-Fi led is blue when...

p.kaczmarek2 · Accepted Answer

Regarding power metering - maybe try to start BL0942 driver?
The power metering chip is usually BL0937 or BL0942. So we have a 50% chance to get BL0942, which is always on the same UART port.
If it's BL0937, then it can use any pins, so it would be hard...

But maybe let's try BL0942.
Step 1: Config->Startup command text:

Step 2: restart

Step 3: do you get results?

Step 4: calibrate with VoltageSet, PowerSet, CurrentSet (like Tasmota)
https://tasmota.github.io/docs/Power-Monitoring-Calibration/

p.kaczmarek2 · Accepted Answer

Wait please. I have some hints.
First, this looks like '7', as in BL0937:

Second, this is BL0942:

so chip from photo is not BL0942 because it has 8 and not 10 pins.
Third, this is BL0937:

Fourth:
for BL0937 you must do:
- remove "startDriver", this is not needed
- check which GPIO pin is used for CF, CF1 and SEL
- set those GPIO in Config->Device:

You need to set all 3 pins. Check which is which with multimeter.

Dodano po 7 [minuty]:

Well, just remove the line and save empty field.

And reboot.

The thing you need to do now is to determine which T34 pins are used for:
- CF
- CF1
- SEL
of BL0937.

Dodano po 9 [minuty]:

and of course you might need to reboot for BL0937 driver to start, at least for the first time.

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

Helpful post? Buy me a coffee.

Svetlaya · Accepted Answer

Added video firmware and management in the smart home system MajorDoMo

p.kaczmarek2 · Answer

Hellp, I can try to help you.
First of all, I've read that article:
https://www.v-elite.ru/t34
and I must say, very good job! Excellent writeup, thanks!

Regarding power monitoring - can you tell me if it's BL0937 or BL0942?

Without this knowledge it may be hard to guess. BL0937 can be on any pins so there are many combinations to check...

but if it's bl0942, then just do "startDriver BL0942" and try to check the readings - do anything show up?

Svetlaya · Answer

Sorry for my bad English... Thank you for the excellent firmware! And to everyone who took part in the project!) I will be grateful for your help!

Svetlaya · Answer

Thank you!
I tried yesterday to put BL0942.
Voltage - very big!
But I did not set it as you showed.
After activating the driver, I introduced an adjustment.

In the evening I'll just try to activate the driver.

p.kaczmarek2 · Answer

The thing is, we don't know if it's BL0942 or not. I am just guessing. It could be BL0937 as well. Are you able to look at the chip and read the marking?

Svetlaya · Answer

can not see(( Added after 6 [minutes]:Question.# startDriver BL0937Will disable BL0942? Added after 12 [minutes]:If adjustments were made# VREF 15987.125000# PREF-683.023987# IREF 272302.687500How to reset to default?

Svetlaya · Answer

Thank you! I had to disassemble again and call contacts))) Datashit

p.kaczmarek2 · Answer

Sorry, is cv a CF1 ? And H is SEL? Those pin numbers: P22, P23, P24, etc are here: Do something like: and reboot

Svetlaya · Answer

Yes, is work monitoring. Designations on the board. Didn't change. For those who buy such a power plug. You can match the numbers by datashit or by looking at my config. not work! this is work

p.kaczmarek2 · Answer

Example, real configuration is different. Good jobs! Thanks. Is there anything else I may help you with?

Svetlaya · Answer

Not on this topic) Thanks for your help and your project! I am preparing a new article - LED RGB Strip (Magic Home) Hope it's ready next week.

p.kaczmarek2 · Answer

Thanks. Remember to try out: Code: text Expand Select all Copy to clipboard backlog startDriver SSDP; startDriver NTP SSDP is so devices show here: NTP is for realtime from web.