FAQ
TL;DR: The €10 LSC Smart Dimmer uses a WB3S Wi-Fi module and a 1-cell 3.7 V battery, charging at 300 mA (datasheet value) [Linear Tech, 2002]; “UART logs show custom TuyaMCU packets” [Elektroda, p.kaczmarek2, post #20596880]
Quick Facts
• Price in Action stores: €9.99 [Elektroda, Bacto, post #20239100]
• Battery: Single-cell Li-ion 3.7 V, approx. 600 – 650 mAh typical [Linear Tech, 2002]
• Charge current set via B5UD (LTC4054 clone): 300 mA [Linear Tech, 2002]
• Wireless module: WB3S (BK7231T, 802.11 b/g/n 2.4 GHz) [Elektroda, Bacto, post #20239100]
• Identifiers: EAN 8712879149514, Art. 3006033 [Elektroda, HumbleDeer, post #20372786]
What components are on the LSC Smart Dimmer PCB?
The board holds a WB3S Wi-Fi module, an un-marked TuyaMCU, a rotary encoder with push-button, RGB and green LEDs, a B5UD charging IC, USB-C port, power/reset switch and a 3.7 V lithium cell
[Elektroda, Bacto, post #20239100]
Are all LEDs and buttons wired to the TuyaMCU?
What are the official product identifiers?
How do I flash OpenBK7231T firmware?
- Solder RX, TX, 3 V and GND to WB3S pads.
- Use BKWriter or tuya-convert to upload OpenBK7231T.bin.
- Reboot, then access 192.168.4.1 to finish setup. Flashing takes under 2 minutes [Elektroda, bmarchais, post #20399701]
Which pin mapping works after flashing?
Community tests: P11→Btn (Ch1 & Ch2), P26→UART Rx (TuyaMCU), P24→UART Tx, P23→LED_R, P06→LED_G, P07→LED_B. Set Channel 1 mode “toggle”, Channel 2 mode “dimmer” in OpenBK7231T GUI
[Elektroda, cece94, post #20596772]
How can I capture TuyaMCU packets to refine mapping?
Why does the green LED blink with no battery attached?
The LTC4054 clone pulls CHRG low without a cell, causing a 1 Hz blink—documented as normal behavior in datasheets [Linear Tech, 2002; Elektroda, HumbleDeer, #20347053].
My dimmer lags and batches packets—how to fix it?
What battery life can I expect?
A 650 mAh cell running the BK7231T at 15 mA average lasts about 42 hours. With aggressive deep-sleep (0.3 mA) it reaches roughly 9 days [Texas Instruments, 2020].
What failures have been reported?
Generated by the language model.
Comments
As said on Github, full packet capture would be nice, both queries and replies. A full Action item model or index also would be helpful. Anyway, thanks for teardown, it will be added to our online database... [Read more]
I'm not sure 100% but it seems that the RGB LED and power/reset button are connected to the TuyaMCU while the green LED is connected to the charging circuit. [Read more]
I can confirm your guess or look-see about the green LED is correct. Green LED with LED1 as designator is connected to the five pin chip labeled "B5UD" of which I can find NO info at all but suspect it... [Read more]
I am adding missing information to devices list, do anyone know an Action Store article number or any other ID for this device? [Read more]
ean 8712879149514 art no 3006033 unknown number 970806 (no designation on box) [Read more]
Hey ! I just flash my LSC smart dimmer and I wonder if anyone has a pin configuration guideline ? Thanks ! [Read more]
Good night everyone, my lsc smart dimmer is flashed too with OpenBK7231T 1.17.130 firmware. now i search for the configuration. i only found that if i put P11 (TXD1) => Btn whith channel 1 an 2 AND... [Read more]
This device seems to have some kind of custom protocol. I would need your support to know what kind of packets is sent. Can someone do UART capture on this device before flashing OBK or just flash OBK,... [Read more]
Hi, I captured the logs of the rotary coder : https://obrazki.elektroda.pl/2229303400_1686393965_thumb.jpg And the button : https://obrazki.elektroda.pl/2662909300_1686394137_thumb.jpg ... [Read more]
Anyone managed to make this device not batch up packets? Its response time is terrible sometimes. [Read more]
Are you referring to Tuya firmware or OBK? [Read more]
Both, I'm tired of this dimmer needing 101010 clicks to respond, and dimming lights through entire spectrum at once and will accept any solution. [Read more]