Deltaco SH-P01, SH-P01-3P Teardown and BK7231T Flashing Guide with WB2S WiFi Module

Hello,

Here's the teardown for the smartplug Deltaco SH-P01 and SH-P01-3P.
Serial: PO194180
https://deltaco.se/sh-p01 (260106)



These have been available, and still are, in the Swedish store Clas Ohlson.
https://www.clasohlson.com/se/Deltaco-smart-plug-SH-P01-inomhus/p/36-8479 (260106)

The WiFi module in these is the WB2S and I have successfully flashed
the BK7231T firmware on eight of these.







However I had to destroy one to open it since they are glued.
The rest I saw a hole on the side to be able to solder
VBAT, GND, RX, TX to a generic USB2TTL adapter I got from eBay.
The pin connection should be:
Adapter pin - WB2S pin
3.3 V - VBAT
GND - GND
TXD - RX
RXD - TX

The adapter uses a CH340G chip, so Windows needs drivers for this to
add a virtual COM port when inserted into USB. I run Windows 10 and probably
downloaded the driver here (it can be found on other places):
https://cdn.sparkfun.com/assets/learn_tutorials/8/4/4/CH341SER.EXE (260106)
https://www.ebay.com/itm/141976858044 (260106)









I downloaded the software (v176) to flash from here:
https://github.com/openshwprojects/BK7231GUIFlashTool/releases
And the flasher downloaded this image:
OpenBK7231T_UA_1.18.226.bin

The pins are configured as:
Button : pin 6
WiFi-LED: pin 8
Relay : pin 24

This is the configuration used in the webapp that OpenBekenIOT uses:



/Ola Löfberg

Good idea, it's certainly better than tearing apart whole plug.

Did you really manage to flash it while powering directly from USB to UART 3.3V pin? That's not very reliable, but still, you're lucky that it worked out well.

Don't forget to add PowerSave 1 command to the startup line, those devices have low quality power supplies.