[CB2S/BL0937] No name plug (QNCX) 20A (actually 16A relay)

GP007 915 11

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#1 29 Apr 2023 13:42

Plug purchased on ali in the promotion "3 items from" for 2.99 USD as 20A with energy measurement. The box is completely noname, there are also no inscriptions on the plug.
Plus there are two diodes - blue for wifi, red for on / off.

Link without promotion: link

Initially I was going to use it with domoticz with Tuya plugin but curiosity prevailed.
Attempts to upload via tuya cloudcutter failed.

Demolition - practically damage-free with such a clamp:

Now I know that such sockets can be dismantled without much problem, only a moment of patience is required, i.e. 2-3 minutes

Inside there is a surprise: a 16A relay, the thickness of the solder and the PE cable is not great.
I opened a dispute on ali and they gave back half the price without resistance.
There we find the CB2S chip and the energy measurement using BL0937

I desoldered the CB2S for programming, the braid is necessary.
Soft uploaded using BK7231 GUI Flash Tool - here I had a small problem at the beginning because WIN10 lost the drivers for CP2102 after the next update, but after realizing the situation it went without major problems.

Configuration with the help of other topics from the electrode:

P6 BL0937CF1
P7 BL0937CF
P8 LED (blue)
P10 Btn
P24 BL0937SEL
P26 Rel (probably also a second red diode here)

After calibrating with a 60W bulb that is actually 62W at 229V and a Fluke multimeter it seems to measure approx.

Only with the OFF position there is a strange measurement instead of 0.

edit: Flag 38 helped with off measurement
If there was such a plugin, please remove it, this is the third device on which I uploaded openbeken, previously two mini switches - one OTA, the other soldering.
Thanks to the creator - respect!

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GP007 GP007

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GP007 wrote 10 posts with rating 6. Been with us since 2019 year.
#2 29 Apr 2023 18:00

p.kaczmarek2 p.kaczmarek2

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#2 29 Apr 2023 18:00

Hello, I see this is another LSPA9 style device. I often see such, but another review won't hurt, it's hard to judge what is what if the manufacturer does not sign the product.

Strange measurements reported by BL0937 can be "cut" by turning on the appropriate flag, which resets them when the relay is open.
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/flags.md
I think I'll set it to on by default...

Code: text Expand Select all Copy to clipboard
38 [Power] Set power and current to zero if all relays are open

Do you have maybe 2MB flash backup of this plugin?

PS: Copy the template from Web App->Config, then it is formatted better.
#3 29 Apr 2023 21:21

GP007 GP007

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#3 29 Apr 2023 21:21

I have some backup readResult...-33-56.bin Download (2 MB)
#4 30 Apr 2023 12:55

GP007 GP007

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#4 30 Apr 2023 12:55

Ustawiłem flagę 30 [MQTT] Enable Tasmota TELE etc publishes (for ioBroker etc)
i mimo wydania komend:
VCPPublishThreshold 0.5 0.01 0.5 oraz VCPPublishIntervals 30 60
średnio co 3 sekundy mam mqtt jak poniżej:

tele/obk550A13C4/SENSOR {"Time":"2023-04-30T12:45:48","ENERGY":{"Power": 0.000000,"ApparentPower": 0.000000,"ReactivePower": 0.000000,"Factor":1.000000,"Voltage":239.068634,"Current":0.000000,"ConsumptionTotal":0.000000,"ConsumptionLastHour":0.000000}}
tele/obk550A13C4/SENSOR {"Time":"2023-04-30T12:45:51","ENERGY":{"Power": 0.000000,"ApparentPower": 0.000000,"ReactivePower": 0.000000,"Factor":1.000000,"Voltage":237.840759,"Current":0.000000,"ConsumptionTotal":0.000000,"ConsumptionLastHour":0.000000}}
tele/obk550A13C4/SENSOR {"Time":"2023-04-30T12:45:54","ENERGY":{"Power": 0.000000,"ApparentPower": 0.000000,"ReactivePower": 0.000000,"Factor":1.000000,"Voltage":239.314208,"Current":0.000000,"ConsumptionTotal":0.000000,"ConsumptionLastHour":0.000000}}
tele/obk550A13C4/SENSOR {"Time":"2023-04-30T12:45:57","ENERGY":{"Power": 0.000000,"ApparentPower": 0.000000,"ReactivePower": 0.000000,"Factor":1.000000,"Voltage":237.717971,"Current":0.000000,"ConsumptionTotal":0.000000,"ConsumptionLastHour":0.000000}}
tele/obk550A13C4/SENSOR {"Time":"2023-04-30T12:46:00","ENERGY":{"Power": 0.000000,"ApparentPower": 0.000000,"ReactivePower": 0.000000,"Factor":1.000000,"Voltage":237.104019,"Current":0.000000,"ConsumptionTotal":0.000000,"ConsumptionLastHour":0.000000}}

Boje sie że mój broker mqtt tego nie wytrzyma.
#5 30 Apr 2023 12:59

p.kaczmarek2 p.kaczmarek2

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#5 30 Apr 2023 12:59

I don't think it interferes with anything, but the Tele Tasmota emulation is changed by another command:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/commands.md

Code: text Expand Select all Copy to clipboard
TasTeleInterval [SensorInterval][StateInterval]
#6 30 Apr 2023 13:14

GP007 GP007

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#6 30 Apr 2023 13:14

I tried TasTeleInterval 60 60
but i get the answer:
Error:CMD:cmd TasTeleInterval NOT found (args 60 60)
unknown command
#7 30 Apr 2023 13:48

p.kaczmarek2 p.kaczmarek2

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#7 30 Apr 2023 13:48

Maybe you have too old version. Additionally, you need to run these commands on every boot, eg via autoexec.bat
#8 30 Apr 2023 14:32

GP007 GP007

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#8 30 Apr 2023 14:32

Thanks! I had version 1.17.11, after uploading 1.17.74 it's ok.
#9 02 May 2023 19:58

Mateusz_konstruktor Mateusz_konstruktor

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#9 02 May 2023 19:58

GP007 wrote:
The box is completely unnamed

Try peeling off the sticker covering some of the markings.
#10 12 May 2023 09:29

IDzOR IDzOR

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#10 12 May 2023 09:29

Hello!
I've bought similar plug on aliexpress. Paper box, looks the same, however the plug is signed as ELIVCO, model LSPA9. Interesting thing is, unlike to Elivco plug in other (
p.kaczmarek2) posts, this one has CB2S module with Belon chip BL2028N inside, along with power metering chip BL0937.
OpenBeken pinout is the same as the GP007 wrote in initial post. GP007 hank you for that!
I have made successful backup via bk7231tools as well as via hid_download_py. hid_download_py program was significantly faster!
Flashed OpenBK7231N_QIO_1.17.104, works just fine. Thank you mr p.kaczmarek2!

Have just one pinout question. There is a Red LED which is in my case lighting all the time. I was wondering if it's possible to synchronize it with button (on/off)

Attachments:

firmware_dump_elivco_plug_wpm-BL2028N-BL0937_bktools.bin Download (2 MB)

firmware_dump_elivco_plug_wpm-BL2028N-BL0937_hid_download_py.bin Download (2 MB)
#11 12 May 2023 09:50

p.kaczmarek2 p.kaczmarek2

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#11 12 May 2023 09:50

Good job! Remember also to try out our new flasher/configurator:
https://github.com/openshwprojects/BK7231GUIFlashTool

You can just download it, and drag and drop your 2MB binary, and take a look:

See? We've got a config for your device.
This tool can extract GPIO config from Tuya firmware, so you get working pinout for OBK.
It's an experimental version, so double check it first, but it should be OK!
Quote:

Device configuration, as extracted from Tuya:
- BL0937 SEL on P24
- Button (channel 1) on P10
- LED (channel 1) on P23
- BL0937 VI on P6
- WiFi LED on P8
- BL0937 ELE on P7
- Relay (channel 1) on P26

Here is the same as OBK json:
Code: json
Log in, to see the code

(generated here https://openbekeniot.github.io/webapp/templateImporter.html )

Now, to your question - I don't know which is red LED. It may be the LED that is on P23, or a WiFi LED, that is on P8. It seems that they are both controllable. You can set the LED to the same channel as relay and it will follow the relay. You can also set LED_n role, which will mean that LED is on when relay is Off.
#12 12 May 2023 11:40

IDzOR IDzOR

Level 2

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#12 12 May 2023 11:40

Thanks a lot. You solved it.
This pinout perfectly works for me:

P6 BL0937CF1
P7 BL0937CF
P8 WifiLED //Blue LED
P10 Btn (channel 1)
P23 LED_n (channel 1) //Red LED lighting when relay is switched ON, not lighting when relay is switched OFF
P24 BL0937SEL
P26 Rel (channel 1)
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