Short teardown post to complete the series of wall switches offered from Bunnings under the Deta name. Was flashed in-place with usb to serial adapter and OpenBK7231T_App under Ubuntu.

It looks like a very nice and easy to flash device. The U3 chip may confuse some people into thinking it's a TuyaMCU (it even looks like routed to RX/TX?), but when you read the marking, you can see it is BS814A, which a touch button controller made by Holtek, so not a TuyaMCU.

Yes one button is routed to RDX1 but didn't cause any issues with flashing the WB3S in place. I'm assuming the BS814A outputs high and low logic levels to the inputs of the WB3S and that the USB-Serial programmer has the capacity to override it. It's good the designers of the BS81 series chips have kept I/O usage to the minimum.

[BK7231T/WB3S] Deta Grid Connect Triple Smart Switch - 6903HA

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#1 20578399 13 May 2023 11:53

tonyb62 tonyb62

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20578399 13 May 2023 11:53

Short teardown post to complete the series of wall switches offered from Bunnings under the Deta name.

https://www.bunnings.com.au/deta-grid-connect-smart-triple-gang-touch-light-switch_p0161014

Was flashed in-place with usb to serial adapter and OpenBK7231T_App under Ubuntu.

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#2 20584215 17 May 2023 17:22

p.kaczmarek2 p.kaczmarek2

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20584215 17 May 2023 17:22

It looks like a very nice and easy to flash device. The U3 chip may confuse some people into thinking it's a TuyaMCU (it even looks like routed to RX/TX?), but when you read the marking, you can see it is BS814A, which a touch button controller made by Holtek, so not a TuyaMCU.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#3 20585294 18 May 2023 12:24

tonyb62 tonyb62

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20585294 18 May 2023 12:24

Yes one button is routed to RDX1 but didn't cause any issues with flashing the WB3S in place.

I'm assuming the BS814A outputs high and low logic levels to the inputs of the WB3S and that the USB-Serial programmer has the capacity to override it.
It's good the designers of the BS81 series chips have kept I/O usage to the minimum.
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