Deta Grid Connect Smart Quad Gang Touch Light Switch - 6904HA - Teardown

Thanks for submitting teardown. Very nice quadruple touch light switch. I saw similar ones using TuyaMCU, but that one is just WiFi module, that's good, that's more configurable than MCU version.
At first I was confused with the pricing, which seemed high, but then I realized it's $73.58AUD and not USD, so that's not THAT much in retrospect.

wolfieeewolf wrote:

Pins

P1 - WifiLED_n - If you want the White LED on when Wifi is connected
or WifiLED for White LED on when Wifi is disconnected
P6 - Button - Channel 3
P7 - Relay - Channel 3
P8 - Relay - Channel 2
P9 - Button - Channel 1
P10 - Button - Channel 4
P14 - Button - Channel 2
P24 - Relay - Channel 4
P26 - Relay - Channel 1

Button Layout on device - I did check it twice but let me know if I have it wrong.

Top Left - Channel 1
Bottom Left - Channel 2
Bottom Right - Channel 3
Top Right - Channel 4

I used a 3D printed pogo pin jig to go over the top of the WB3S chip so that no soldering of wires was needed.

I flashed a Deta 4 gang 6904HA series II and the pins are the same but I wanted the switch to go across ways not vertical. So 1 and 2 across the top and 3 and 4 across the bottom. This resulted in the following pin layout.

P6 - Button - Channel 4
P7 - Relay - Channel 4
P8 - Relay - Channel 3
P9 - Button - Channel 1
P10 - Button - Channel 2
P14 - Button - Channel 3
P24 - Relay - Channel 2
P26 - Relay - Channel 1

Interestingly these did not correspond in any way to the switch wire locations on the actual switch except for button 4.

BTW I am now getting this notification in HA.

This stops working in version 2024.2.0. Please address before upgrading.
Some MQTT entities have an entity name that starts with the device name. This is not expected. To avoid a duplicate name the device name prefix is stripped of the entity name as a work-a-round. Please inform the maintainer of the software application that supplies the affected entities to fix this issue.

Thank you for letting us know. We'll change the standard if it's required. It seems that HA likes to change things.

p.kaczmarek2 wrote:

Thank you for letting us know.

BTW you may also be interested to know that this switch once flashed also works in Hubitat using the Tasmota Driver and App by Markus Liljergren (oh-lalabs). As does the series II Brilliant smart plug that has a CB2S chip which can also be flashed with a jig so no soldering.

Well, I wasn't even aware that there is such a system as Hubitat, but that basically is the whole point of our Tasmota JSON compatibility.

OpenBeken emulates Tasmota features so it can use existing Tasmota integrations to bring new platforms like BK7231N, BK7231T, W600, W800, BL602 and much more to existing ecosystems.

p.kaczmarek2 wrote:

Well, I wasn't even aware that there is such a system as Hubitat,

It is an off shoot from Smartthings and uses Groovy. It is improving all the time. They have just released a new C-8 hub.

I am so far having 100% success rate connecting OpenBeken flashed devices to Hubitat Elevation®.

It seems that there are enough generic devices code to enable most OpenBeken flashed devices to work.

The Mirabella Genio double plug flashed with BK7231N using Cloud-Cutter and using a double power point template works in Hubitat.

Edit: BTW all devices have also worked with Gary Milne's Tasmota Hubitat drivers.

Any chance anyone has the stock firmware for this device? I lost my backup.