GIRIER Tuya Wifi Smart Dimmer Switch Module 10A

[martin072]

I just got a GIRIER Tuya Wifi Smart Dimmer Switch Module 10A from AliExpress, however, the chip doesn't look familiar to me at all.. Its branded as "16ew/8.24" with a pcb board with version number ZH-Z06 REV:A

Anyone any idea if this is an ESP compatible chip? of able to be made compatible?

see pictures below

[sfromis]

The form factor with 7/8/7 pins on the edge does not look like one of the usual ESP8266 based modules. Maybe there are clues on the back side of the small blue board, or on the back side of the smallest green PCB. If you can use a Wifi tool to get the MAC address (like in pairing mode), you can look it up on a site like macvendors.com to check if it is Espressif.

With 8 pins to the main (larger green) PCB, it should be feasible to work out what those pins are, and connect an ESP module instead, using wires instead of worrying about matching pinout.

[martin072]

Haven't powered it on yet, I did de-solder the little pcb, and on the lower side is only a HK HK32F030MF4P6, which is an ARM MCU, probably the MCU used by tuya for the serial communication. Most likely it will be an ARM wifi chip I Guess..

I am hoping this device actually uses a simple PWM signal (perhaps with a ZC input). so I can change that board with a small ESP

[sfromis]

My guess would be that the MCU used for wifi is inside the metal cover, with the ARM chip you found acting as the main processor, "TuyaMCU", using the wifi MCU as a "wifi modem". That structure is very common among Tuya devices.

And as PWM is quite common for controlling the high power side of dimmers, the odds should be good of a feasible Frankenstein job. Doing a bit of espionage with the factory firmware still in place can also be quite illustrative....

[martin072]

So I tried to probe out the pins that run to the main board, and found the obvious ones like 3.3v, GND, RST. Also found a pin that leads to the input of an optocoupler, so I will assume this takes a pwm.

I have two other pins that I cannot make sense of. It might look like a zero-cross input, but there are two. See attached drawing and small probe from an oscilloscope. Q3 and Q4 run to the small mainboard, assuming they are inputs off some sort?

Maybe some electronic brains here that could try to explain what these are for?

[MaWork77]

[sfromis]

Did you check the MAC? Easy way the check for an ESP chip inside.

To me, the pinout visible on the back side of the small blue PCB does not look like an ESP chip inside. Unless the silk screen print does not match, looks like you're out of luck.

[kalayda]

Where the bottom 10 holes are connected? Can it be used to flash BK7231T?

[MaWork77]

it's a Beken BK7231 Chip. I install in my module a LM1 module with a ESP Chip.
I'm still testing, but switching on by script is already possible

[btsimonh]

If you want to use the module without modification, search 'OpenBeken' - we have the start of an alternative firmware for the bk7231 based devices. It's not TAS, but it does work. Forum discussion here.
I have modified two direct PWM devices so far, a RGBWW and RGB.
TuyaMCU is in development - serial logs welcome.

[rtrabold]

Hi, I have the same dimmer but is REV:B, is the same but it came with a CB3S module. I sucessfully flashed OpenBeken on it.
The issue now is to find correct TuyaMCU configuration, dpIds and function. Any clue about it?
Tested with:

startDriver TuyaMCU
setChannelType 1 toggle
setChannelType 2 dimmer
tuyaMcu_setDimmerRange 0 1000
linkTuyaMCUOutputToChannel 1 1 1
linkTuyaMCUOutputToChannel 2 2 2

But nothing happens....

[sfromis]

The Tasmota project is not a great place to ask about how to use OpenBeken....

[kalayda]

@rtrabold Could you please explain how did you connect board to flash it?
I have Aubess dimmer with ZH-Z06-A REV: A. Suspect it has BK7231T onboard. For using ESPHome going to flash libertuya with help of BKWriter app.
But can't understand, which pins to connect with USB-UART connector. Should I use some of ten holes on the board?

[btsimonh]

@kalayda - it's not very polite to ask the questions here about BK devices.
Search here:
https://www.elektroda.pl/rtvforum/find.php?q=openbeken
or here:
https://github.com/openshwprojects/OpenBK7231T_App
br,
Simon

[openshwprojects]

This device is not using TuyaMCU. It has a custom protocol.
Details:
https://www.elektroda.com/rtvforum/topic3985978.html