# Generic RGB Wall Switch teardown

Yep! Another teardown post! This one was also a cheap "because i'm curious" post.

----

# What

It's a 'decora' style wall switch with WiFI and an RGB color changing paddle.

{{<figure name="official_render">}}

The product listing was very non specific:

> EU US WiFi Smart Wall Switch Push Button Timer Relay Switch Voice Remote Control RGB LED Night Light Lamp TUYA Alexa Google Home

I saw `TuYa` in the item description and hoped that it would be based on an ESP8266 module or at least use a pin-compatible module. After all, there are a few such devices on the [Wall Switches and Dimmers section](https://templates.blakadder.com/switch.html) of the tasmota templates repository.

## Teardown

Almost immediately after opening it became clear: the item is a variant of the [`SSMS118-01AI`](https://templates.blakadder.com/moko_SSMS118-01AI.html) switch.

Other than that, the internals are pretty predictable / standard.

From the side you can see plastic clips holding the paddle to the Aluminum substrate.

{{<figure name="td01_side">}}

No screws on the back, so we probably open it from the front.

{{<figure name="td02_rear">}}

If the paddle was removed, the philips screws would be unobstructed.

{{<figure name="td03_front">}}

{{<figure name="td04_top">}}

RGB leds on a thin PCB with a reflective sticker attached. The sticker probably makes the LEDs appear brighter.

{{<figure name="td05_no-face">}}

Philips screws removed and the switch immediately splits in half. I wish everything was this easy to get into!

{{<figure name="td06_cracked">}}

Almost textbook design at this point; keep the mains voltage on it's own PCB and only send back low voltage / signal to the controller PCB.

The mains PCB attaches to the controller PCB via 3 sets of three male/female pin headers along the top and bottom of the left edge and one side of the right edge.

{{<figure name="td07_split-faces">}}

Sparsely populated and a generic no-name relay. But at least there's a fuse!

{{<figure name="td08_mains-pcb">}}

Mains PCB is marked `HYS-00-004-MAIN_V1.1` with a datecode of `2019-5-7`.

Equally sparse controller PCB. Aside from the _massive_ mechanical switch and the three transistors for the RGB leds, everything lives on the ESP module.
At first glance, the module looks like a standard ESP-12... but it isn't! There are 6 pins on each of the three edges, not the 8 that would be present on an ESP-12 module.

{{<figure name="td09_lv-pcb-cover">}}

Controller PCB is marked `HYS-00-004-WIFI_V1.1` with a datecode of `2019-4-11`.

After a bit of reverse image searching, the ESP based module appears to be a WT8266-S1s. The datasheet can be found [here](https://www.seeedstudio.com/document/word/WT8266-S1%20DataSheet%20V1.0.pdf).

To save you a click, here's the useful bit:

{{<figure name="esp_pinout">}}

I checked a few of the pins listed on the  [`SSMS118-01AI template`](https://templates.blakadder.com/moko_SSMS118-01AI.html) switch and they appeared to match the PCB shown above.

Thats all for this one!