1. What microcontroller and wireless module does the TS02-EU-B2 use?
It runs a BK7231N Wi-Fi SoC mounted on a CB3S daughterboard [Elektroda, p.kaczmarek2, post #21012255]
[CB3S/BK7231N] Double black light switch TS02-EU-B2 - cloud cut-off
TL;DR
- The TS02-EU-B2 black double switch can be freed from the cloud and controlled locally with the same BK7231N-based approach used on the white triple model.
- The device uses a CB3S module with BK7231N, and the extracted Tuya pin map assigns the buttons to P10 and P8, the relays to P14 and P24, and the WiFi LED to P23.
- Home automation tinkerers and BK7231N modders can use this guide to identify the hardware, flash it safely, and avoid buying a switch that cannot be moved off the cloud.
- The template matches the triple version, so the same flashing setup works and the switch is easy to convert to fully local operation.
- Small PCB changes exist, including a different button controller and the absence of one button on the double model, but they do not change the pin roles or the flashing method.
I recently described the triple white light switch TS02-EU-W3 , now it`s time for its brother model, the black, double version. In addition to the process of changing the charge so that it works 100% locally, I will compare its interior with the previously discussed version.
We start with the purchase, but also with the price - surprisingly, the double black version was a few zlotys more expensive than the triple white version. Does this mean that we pay extra for the color itself?
Product description - standard, but our goal is to change the firmware, so it does not concern us. This SETTI+ application is interesting, I haven`t tested it yet, but it`s probably another clone of the Tuya application.
Parameters:
Packaging:
Instructions, this time in Polish:
The set includes mounting screws:
Manual EN:
And the switch itself:
Interior of TS02-EU-B2
We are taking off the front. By the way, we also compare with white, triple version : :
The WiFi module is the same. One button simply wasn`t installed.
On the other hand, the tile is slightly different. The button controller has no marking, it has two more pins, and the element numbers on the descriptive layer have also changed.
The power supply is based on OB25133JP. It`s the same in the triple version.
Here the LDO is also on the board with the power supply:
Changing the TS02-EU-B2 load
Minor changes to the PCB do not matter here, we program CB3S as in the case white, triple version .
A few photos:
Flasher rises to the challenge again and detects the configuration:
https://github.com/openshwprojects/BK7231GUIFlashTool
Tuya configuration:
Code: JSON
Verbal description:
Device configuration, as extracted from Tuya:
- Button (channel 1) on P10
- WiFi LED on P23
- Relay (channel 2) on P24
- Button (channel 2) on P8
- Relay (channel 1) on P14
Device seems to be using CB3S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424
OBK template:
Code: JSON
Summary
I compared tiles from both products and the differences are very small. In the white version (discussed earlier), there is no U8 capacitor at the U2 button controller. The button controller itself has also changed - it has two more pins. This is probably where the change in PCB layout came from. Perhaps the previous batch in the factory ran out or they found a cheaper/better equivalent and modified the layout for it.
I also compared the templates - the template for the double version matches the triple version. The manufacturer did not change the roles of the pins this time. It will probably fit the single version as well.
Overall, the product is easy to free from the cloud and you can order it with confidence.
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