What chipset and module does the YX-B3S1-VER00 board use?
The small daughterboard is a Tuya CB3S module built around the BK7231N Wi-Fi MCU [Elektroda, VinceTheFox, post #20620024]
[BK7231N] Tuya Smart Power Strip Review: 4AC + 4USB Ports, AliExpress, YX-B3S1-VER00 PCB
TL;DR
- A Tuya Wi‑Fi smart power strip from AliExpress with 4 AC outlets and 4 USB ports was opened and tested for local flashing.
- The JSON config targets model XS-A26 on a CB3S board with a BK7231N chip.
- The strip is rated AC100-240V, 16A, 3450W, with 3.1A USB power and a 1.5m power line.
- Programming worked by briefly unplugging VCC to enter mode; CEN was not found, and an external 3.3V supply caused problems.
- After flashing and configuration, the strip worked perfectly.
Generated by the language model.
Hi,
I'd like to share the results of this device from AliExpress.
I took elements from similar topics, as it has the same housing as this one, and a chip very similar to this one.
For dissassembing, the 6 pads on the back can be easily removed, giving access to 6 triangle screws:
The chip is a BK7231N on a small PCB with indication YX-B3S1-VER00
I have not tried programming the chip while still soldered to main PCB. Instead I have unsoldered it and used the pinout below:
I have not been able to find where is the CEN pin, I tried the 2 pins at the opposite of VCC and GND but it didn't work. On the other hand, unplugging VCC pin for a short time did the job to put the chip in programming mode.
Initially I also used a separate 3.3V power source instead of my cheap USB to TTL adaptor to power the chip, but for unknown reasons this option brought more problems than expected, as I was not able to put the chip in programming mode with this external power source.
Nevertheless using only the power source from the USB to TTL device (using 3.3V of course) was sufficient and appropriate in my case.
The device was detected by bk7231flasher v1.1.0b as:
Now it works perfectly. Thanks to the community!
Edit - Here's the json config I used:
I'd like to share the results of this device from AliExpress.
I took elements from similar topics, as it has the same housing as this one, and a chip very similar to this one.
For dissassembing, the 6 pads on the back can be easily removed, giving access to 6 triangle screws:
The chip is a BK7231N on a small PCB with indication YX-B3S1-VER00
I have not tried programming the chip while still soldered to main PCB. Instead I have unsoldered it and used the pinout below:
I have not been able to find where is the CEN pin, I tried the 2 pins at the opposite of VCC and GND but it didn't work. On the other hand, unplugging VCC pin for a short time did the job to put the chip in programming mode.
Initially I also used a separate 3.3V power source instead of my cheap USB to TTL adaptor to power the chip, but for unknown reasons this option brought more problems than expected, as I was not able to put the chip in programming mode with this external power source.
Nevertheless using only the power source from the USB to TTL device (using 3.3V of course) was sufficient and appropriate in my case.
The device was detected by bk7231flasher v1.1.0b as:
Device configuration, as extracted from Tuya:
- Relay (channel 3) on P14
- Relay (channel 4) on P9
- Pair/Toggle All Pin on P26
- WiFi LED on P23
- Relay (channel 2) on P8
- Relay (channel 5) on P24
- Relay (channel 1) on P7
Device seems to be using CB3S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424Now it works perfectly. Thanks to the community!
Edit - Here's the json config I used:
{
"vendor": "Tuya",
"bDetailed": "0",
"name": "Wi-Fi Smart Power Strip",
"model": "XS-A26",
"chip": "BK7231N",
"board": "CB3S",
"flags": "1024",
"keywords": [
"Smart Power Strip",
"USB Power Supply",
"4 Gang",
"Power line size: 1.5m",
"Input voltage: AC100-240V 50/60Hz",
"Rated current: 16A",
"Rated power: 3450W",
"USB rated power: 3.1A",
"WIFI: 2.4GHz 802.11b/g/n",
"Long* wide* high: 229*89*41mm"
],
"pins": {
"7": "Rel;1",
"8": "Rel;2",
"9": "Rel;4",
"14": "Rel;3",
"23": "WifiLED_n;0",
"24": "Rel;5",
"26": "Btn_Tgl_All;0"
},
"command": "",
"image": "https://obrazki.elektroda.pl/9705431600_1686945840.jpg",
"wiki": "https://www.elektroda.com/rtvforum/topic3984262.html"
}
Comments
Very nice review. Isn't that module a Beken version of LM2? Pinout seems to be matching. https://obrazki.elektroda.pl/9274397200_1687257035_thumb.jpg Btw, you can script that device so single... [Read more]
https://github.com/OpenBekenIOT/webapp/pull/157/commits/3723c3d67edb5bcaef1e3a0ccdd8325cc1bc4098 [Read more]
Oh, so it wasn't on our devices list already? I must have missed that! Thank you, added. It seems we're reaching 650 devices now. [Read more]
I could not get this chip into programming mode by power-cycling it. Touching the round pad at the back that is closest to the solder pads with ground did the trick for me. So I suppose that is the CEN... [Read more]