[BK7231N] 16A Mini Smart Switch from aliexpress - configuration

Another AliExpress Choice Day purchase.

Not been able to do a teardown as I feel like I'll destroy the device. Not easy to open.

Case is different to other similar mini smart switches.
Rear button tab is rotated
Case is a matt PC finish - rather than the others I have which are a gloss finish.

Different config also

Used tuya-cloudcutter to flash OpenBK (didn't even set up in SmartLife app - just went straight to cloudcutter)
These cloudcutter settings allowed the exploit
> By firmware version and name
> 1.2.1 - BK7231N / oem_bk7231n_control_switch
> Aubess
> 16A Mini Smart Switch

LED_n 8
Rel 26
Btn 10
TglChanOnTgl 23

Please don't forget to set the PowerSave 1 in short startup command or autoexec.bat, I have been already fixing one piece of this device with a low quality power supply:
https://www.elektroda.pl/rtvforum/topic3898805.html

I think I have just bought the same device and eventually managed to flash with the BK7231App tools. It was very fussy about the cable. I did unsolder the CB2 board and connected a FTDI adapter and have now done an OTA update to the latest Version: 1.17.54.

I was struggling with the Pin assignments so the above helped, but I used TglChanOnTgl 24 as 23 isn't connected. I don't know what it does and either option seems to work. The device packaging mentions model M-K601, so it is the same as the picture above.

The device has S1 and Neutral connected so it can only be used in proper mains power situations, but it was only £1.50 so I didn't expect too much. It would be useful if the configuration was added to the master database as the Pins are unique.

Thanks for all the excellent work here, this is all new to me!

In case it's useful:

MINI SMART SWITCH (BK7321N)

P6 --> LED_n
P15 --> Rel
P8 --> Btn
P14 --> Btn_n S2

Whilst the box states MK601, the switch inside the box doesn't reference that product code or look like the switch on the box.

anthonythomas wrote:

Whilst the box states MK601 the switch inside the box doesn't reference that product code or look like the switch on the box.

I have tested the M-K601 pin settings above and they trigger the relay but not the LED from the webpage button, whereas these do work as expected.
"pins": {
"8": "LED_n;1",
"10": "Btn;1",
"24": "TglChanOnTgl;1",
"26": "Rel;1"
}

Can anyone post MK601 image so I can add it to the list with this new pinout? Thanks

p.kaczmarek2 wrote:

Can anyone post MK601 image so I can add it to the list with this new pinout? Thanks

In his day I already mentioned it. I replaced CB2S with TYWE2S because OpenBeken was very slow in the CB2S module, even feeding the separate module with 3.3V.



I no longer remembered that I had changed the wifi module



P26 --> LED
P6 --> Rel
P7 --> Btn
P10 --> Btn_n S2

It seems that there are two versions of the MK601.



P26 --> LED
P6 --> Rel
P7 --> Btn
P10 --> Btn_n S2

I think this is going to cause a lot of confusion as I have a different version/conf. I don't have a mini transformer, and looking at Spin55's pictures the pin connections are different too. My version is the same on the inboard (VCC/GRD) side, but the outboard side is only soldered across ADC and Pin 8, whereas Spin55's is CEN. P7 and P6. This would explain the Setting difference, For ref, the setting that work for my board are:
"8": "LED_n;1",
"10": "Btn;1",
"24": "TglChanOnTgl;1", (I don't know what this does!)
"26": "Rel;1"

Definitely, although there are two packages for MK601, the pinouts do match.
I have reviewed the YAML configuration of TYWE2S and taking into account the correspondence of pins with the CB2S board, it can be seen that the configuration is the same, despite having different external packaging:

Pinout TYWE2S:



Pinout CB2S:



Esphome configuration:



TYWE2S --> CB2S mapping:

IO04 --> Btn --> P7
IO03 --> S2 --> P10 (Rx1)
IO05 --> Relay --> P6
IO14 --> LED --> P26

MK601 configuration (two packages):



P26 --> LED
P6 --> Rel
P7 --> Btn
P10 --> Btn_n S2

Added after 13 [minutes]:

MINI SMART SWITCH (BK7321N)

P6 --> LED_n
P15 --> Rel
P8 --> Btn
P14 --> Btn_n S2

Yes, I agree the Pinouts match, but my unit does not have P6 or P7 connected - there is no soldered link. So the settings that show P6 and P7 don't work. I don't know how to see the Yaml file, but I have loaded your suggested settings and they don't work. I can control the switch with HA. I think I must have a third version. It was an AliExpress Choice as well.

https://obrazki.elektroda.pl/9226450300_1682687538.jpg

Seeing the photograph of the board, it seems that you have connected ADC, P8, P24 and P26 (although it does not look good). I think I remember that ADC corresponds to P23 (I'm saying this from memory, now I can't confirm).

Added after 1 [minutes]:

ratseahr34 wrote:

"8": "LED_n;1",
"10": "Btn;1",
"24": "TglChanOnTgl;1", (I don't know what this does!)
"26": "Rel;1"

You are right, ADC is P23, so I have changed my settings "23": "TglChanOnTgl;1", and this now enables the S1/S2 terminals.
Thanks
This, by the way, is what was stated in the original post.
P8 --> LED_n on 1
P10 --> Btn on 1
P23/ADC --> TglChanOnTgl on 1
P26 --> Rel on 1

Gentlemen I am looking for help with the mk601 randomly turns on by itself or randomly sir off:/ help . help .

I have several of them and from an old order they work fine and the last ones I got just work how they want:/ .

If it's on OpenBeken then you need to set PowerSave 1 to give the power supply a bit of a rest and probably also replace the electrolytic capacitor (with a new, low ESR one):
https://www.elektroda.pl/rtvforum/topic3898805.html

I have them on gwr. I thought maybe something could be done without taking them apart :/.

So still without changing the firmware? You haven't uploaded OpenBeken

That's as far as you can return them....

Ok, thank you.
I can dedicate one, how rooms it in your project?

Which rooms? You can group devices in OpenBeken using Tasmota Device Groups

Hi there,

I just bought a MINI Smart Switch and here's the config I used....a bit different compared to those I see posted...
chipset didn't change.

configure pin 26 as you wish...I do like it as wifi led.
...in case you want a quick reference:

pins": {
"7": "Rel;0",
"23": "Btn;0",
"26": "WifiLED_n;0"
}

This set up has worked fine till now. I updated the firmware to 18.4, and rebooted, which it did. However it powered up in the OFF state. I tried to change this and set both Toggle Channels to 1 (had been 0) thinking this was the problem, but now it fails to connect.
Am I going to have to start again - I have tried switching 6 times to enable hotspot mode but it doesn't work.
Any suggestions?

I have sorted it - it eventually reset and enabled the hotspot