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[BK7231N/CB3S] Schneider Wiser smart socket - teardown, CB3S, BL0942

snusken  Cool? (0)
Bought a Schneider smart plug 550B6000 for Danish mains plugs:

Schneider 550B6000 smart plug with three views.

With a hobby knife and a small flat screwdriver, it is possible to open and separate the bottom and top parts. GND and 3.3V are easily recognized:

Disassembled Schneider 550B6000 smart plug with visible PCB.

On the PCB, there is a 10-pin power meter chip. It seemed to be a BL0942. On the CB3S module, RX and TX pins are found:

Opened Schneider 550B6000 plug showing electronic components on the PCB.

A bit more wire tracking reveals the pins for the BL0942 RX, TX, and CF1:

Wiring diagram of CB3S module connected to BL0942 chip.

CB3S pin config.:
P11 - RX
P10 - TX
P9 - Button active low
P7 - BL0942 CF1
P24 - LED active high
P26 - Relay active high

Using a USB-3.3V_UART converter, I flashed the OpenBK7231N_QIO_1.17.437.bin firmware.
In this case, the flash program could retrieve the Tuya parameters from the original firmware.
With the OpenBK firmware, it worked nicely when browsing to the IP address and setting up the parameters.

Table of pin configuration for Schneider 550B6000.

Code: JSON
Log in, to see the code


Screenshot displaying measurement data from the Schneider 550B6000 smart plug.

The YT video at: https://www.youtube.com/watch?v=pkcspey25V4 shows how to connect to HA via MQTT. ! ;)
About Author
snusken wrote 3 posts with rating 4 . Been with us since 2024 year.

Comments

p.kaczmarek2 31 Jan 2024 17:19

Thanks, but can you also include JSON template from the Web App, so I can copy-paste it to our devices list? https://openbekeniot.github.io/webapp/devicesList.html Added after 4 [hours] 22 [minutes]:... [Read more]

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