2 Gang MOES WB2S BK7231T - Aliexpress

Ipn00tic 1281 7

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#1 10 Dec 2022 22:25

Moes 2 GAND Wall Switch - Aliexpress https://pt.aliexpress.com/item/10050036040138..._main.136.24a4caa4WAcIDy&gatewayAdapt=glo2bra

Connect the programmer's direct 5v USB output to the power supply module to the pin labeled "+5v" and the negative to GND (red and blue wire).

Connect RX and TX (green and white wires)

Yellow wire is CEN to activate writing mode.

Program to use is: bk_writer1.60 : https://github.com/openshwprojects/OpenBK7231...a220b19018c2e0a80c130df1c38/bk_writer1.60.zip

Firmware File: OpenBK7231T_UA_1.15.162.bin https://github.com/openshwprojects/OpenBK7231T_App/releases/tag/1.15.162

load the firmware in the software and click on programm, you have 15 seconds to put it in programming mode, taking the yellow wire ( CEN ) and finding it on the GND wire. this connection has to be very fast, less than a second.
if it goes well the program starts to program the new firmware.

Creat File on Filesystem menu "autoexec.bat" and save comands:
Code: text Expand Select all Copy to clipboard
startDriver TuyaMCU setChannelType 1 toggle linkTuyaMCUOutputToChannel 1 1 1 setChannelType 2 toggle linkTuyaMCUOutputToChannel 2 1 2

Home Assistant Discovery configure:

Code: text Expand Select all Copy to clipboard
mqtt: switch: - unique_id: "Interruptor_Quarto_Leonor_relay_1" name: "Interruptor_Quarto_Leonor 1" state_topic: "Luz_Quarto_Leonor/1/get" command_topic: "Luz_Quarto_Leonor/1/set" qos: 1 payload_on: 1 payload_off: 0 retain: true availability: - topic: "Luz_Quarto_Leonor/connected" - unique_id: "Interruptor_Quarto_Leonor_relay_2" name: "Interruptor_Quarto_Leonor 2" state_topic: "Luz_Quarto_Leonor/2/get" command_topic: "Luz_Quarto_Leonor/2/set" qos: 1 payload_on: 1 payload_off: 0 retain: true availability: - topic: "Luz_Quarto_Leonor/connected"

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Ipn00tic Ipn00tic

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#2 10 Dec 2022 23:34

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

#2 10 Dec 2022 23:34

EDIT: Thanks! I see the description is now updated and there is more information.

my only question is - why is there both config for TuyaMCU and for normal IO-driven buttons and relays?

You usually just need to send on of them.
Are relays connected physically to pin 5 and 7 of BK? Are Buttons connected physically to pins 24 and 26 of BK?

When you look at the WB2S IOs:

Pin No.	Symbol	I/O type	Function
1	VBAT	P	Power supply pin (3.3 V), which is connected to the VBAT pin on the internal IC
2	PWM2	I/O	Common GPIO, which is connected to the P8 pin on the internal IC
3	GND	P	Power supply reference ground pin
4	PWM1	I/O	Common GPIO, which is connected to the P7 pin on the internal IC
5	1RX	I/O	UART1_RXD, which is used as a user-side serial interface pin and is connected to the P10 pin on the internal IC
6	PWM0	I/O	Common GPIO, which is connected to the P6 pin on the internal IC
7	1TX	I/O	UART1_TXD, which is used as a user-side serial interface pin and is connected to the P11 pin on the internal IC
8	AD	AI	ADC pin, which is connected to the P23 pin on the internal IC
9	PWM4	I/O	Common GPIO, which is connected to the P24 pin on the internal IC
10	CEN	I	Low-level reset, high-level active (internally pulled high) Docking IC-CEN
11	PWM5	I/O	Common GPIO, which is connected to the P26 pin on the internal IC

Only the following pins connects to the PCB:
- VDD (VBAT)
- GND
- 1RX (P10)
- 1TX (P11)
- PWM4 (P24)
- PWM5 (P26)
So I'd say that at least P5 and P7 does nothing here as it's not connected.

#3 12 Dec 2022 12:44

Ipn00tic Ipn00tic

Level 7

Topic author Helpful post? (0)

#3 12 Dec 2022 12:44

I just saw an identical switch with this configuration on some forum, maybe here.
I put all the configuration I saw and it worked for me.

Now that you said that, I deleted the PIN's configuration and it continues to work the same.
#4 12 Dec 2022 12:51

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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#4 12 Dec 2022 12:51

So it's TuyaMCU working and TuyaMCU config is correct, while, on the other hand, the Relay pins (non-TuyaMCU approach) is not needed here.
#5 08 Jan 2023 13:20

Ipn00tic Ipn00tic

Level 7

Topic author Helpful post? (0)

#5 08 Jan 2023 13:20

I have several double MOES switches, they appear in the identities but they don't appear as devices making integrations difficult.
Mosquitto MQTT only adds in device format through automatic discovery but in my case I cannot activate automatic discovery in openbeken firmware because none has been configured: "No relay, PWM, binary sensor or power driver running.MQTT discovery queued."

Switch configuration is done only by TuyaMCU driver and not by PINs configuration:
"
startDriver TuyaMCU
setChannelType 1 toggle
linkTuyaMCUOutputToChannel 1 1 1

setChannelType 2 toggle
linkTuyaMCUOutputToChannel 2 1 2
"

In this way, openbeken does not automatically disover to the home assistant.

I think it's just necessary to adjust the firmware?
#6 08 Jan 2023 14:39

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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#6 08 Jan 2023 14:39

Home Assistand Discovery does not currently support TuyaMCU devices, but certainly will in the future.

@iprak , it seems it's worth to do it soon
#7 22 Apr 2023 11:59

dominic2 dominic2

Level 1

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#7 22 Apr 2023 11:59

Hey,

I realized that I flash this device differently.
No need to solder! The pins that connect to the other half are working just fine:

[-] | [-]
[RX] | [-]
[TX] | [3.3V]
[-] | [GND]

This makes it super easy and chill to actually flash it. Did it three times, worked three times. Just need to connect CEN to GND for a split second and be done.
#8 23 Apr 2023 03:23

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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#8 23 Apr 2023 03:23

Hmm it's good to know, and it worked well even with TuyaMCU on the board? I had troubles with flashing TuyaMCU devices in the past, I always had to remove the MCU or cut the traces.
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