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VTA+ Ray II Smart Relay Module: Rebranded RSH-SB03-WiFi, BK7231N Teardown and Flashing

jskvbinmv  Cool? (+1)
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I found this Smart Relay Module at Homecenter in Colombia but couldn't find any information about the brand or the module online. After opening it up, I found a model number on the PCB and it seems to be a rebranded version of an RSH-SB03-WiFi Module. Here in Colombia, it is branded VTA+ Ray II (Model No. VTA-84576).

VTA+ Ray II relay module in packaging
White relay module with VTA+ text on a wooden surface. Image of the VTA+ Ray II WiFi module with visible terminals and markings.

The device is easy to open by removing the bottom plate with a flat screwdriver and then pushing on the connectors and the cables to get the module out of its case. No glue anywhere.

Relay module with visible circuit board and capacitor. Close-up of a smart relay module showing electronic components, including capacitors and buttons. Relay module with CB3S chip and HF49FD marking. Close-up of RSH-3L-TD0003-WIFI-V1.0 module showing electronic components on the circuit board.

This was my first time opening up a module without already existing documentation, and I found out the CB3S Chip is not compatible with Tasmota. That's how I stumbled on OpenBeken.

The Datasheet of the CB3S Chip shows the Pinout (inverted/Bottom view).

Bottom view of the CB3S module with pin labels.

3.3V and Ground are connected to the two right pins, and it is relatively easy to solder a wire to those two. CEN, TX, and RX don't seem to be connected to anything (but I am a noob with those things), but it was not too difficult either to add a little blob of solder and connect a wire.

Inside view of a relay module with labeled pins

I then successfully flashed BK7231N using the BK7231Flasher. (Tapped the wire connected to CEN briefly to ground when asked to)

My configuration looks like this. I changed the Button to a toggle because I am using it under a rocker switch:

Screenshot of WiFi relay module configuration interface

This is my first time posting here. So if I missed any vital information, let me know. I also have a backup of the original firmware, I believe...
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jskvbinmv wrote 1 posts with rating 1 . Been with us since 2023 year.

Comments

p.kaczmarek2 23 Dec 2023 08:39

Thank you, can you attach device Tuya JSON, like in our tutorial: And/or OBK template from the web app? [Read more]

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