What silicon powers this GU10 RGB-CW-WW bulb?
The RF board is Tuya’s LN882HKI, a pin-compatible clone of the CBLC5 Wi-Fi module, paired with a BP5758D 5-channel LED driver on the power PCB [Elektroda, XJ_, post #21086437]
[LN882H] GU10 RGBCW Bulb with new VERY tiny LN882HKI module [BP5758]
TL;DR
- A GU10 RGBCW bulb uses a very tiny LN882HKI module with a BP5758 driver and works with OpenBeken for cloud-free Home Assistant control.
- The module exposes UART logging on B8 (TX1) at 921600 baud and flashing on A3/A2 with A9 tied to GND for boot mode.
- A backup with LN882H_Flash_Dumper.py COM3 saved 0x0200000 bytes, and flashing OpenLN882H_1.17.586.bin completed in about 4 seconds at 2000000 baud.
- Two GPIOs control the BP5758D: A0 as CLK and A1 as DAT, and BP5758D_Map 2 1 0 3 4 fixed the red/blue swap.
- WiFi was weak when the module was flashed off-board without the antenna board, and the OBK web status later showed internal temperatures above 100°C when lit.
Generated by the language model.
This is a teardown GU10 RGBCW Bulb with new VERY tiny LN882HKI module, which I've never seen before. Obviously, this device is also supported by OpenBeken, so you can free it from the cloud and use with Home Assistant. Here are the details...
Device can be bought here:
https://www.aliexpress.com/item/1005005881188...o.order_list.order_list_main.4.4e951802GSrd1g
Pin connections for LOG
VCC <- 3V3
GND <- GND
B8 (TX1) -> RX (log is using baudrate 921600)
Pin connections for backup and flash
VCC <- 3V3
GND <- GND
A3 (RX0) <- TX
A2 (TX0) -> RX
A9 -> GND
Backup was done using
LN882H_Flash_Dumper.py COM3 backup 0x0200000
It took about 10 minutes, but the dump is fine
Upload was done (of course after power off/on module to activate bootmode) using:
LN882H_CMD_Tool COM3 download flash 2000000 0x0 OpenLN882H_1.17.586.bin
It took about only 4 seconds - but no error and everything seems to be ok
Just to be sure, I've used baudrate 115200
LN882H_CMD_Tool COM3 download flash 115200 0x0 OpenLN882H_1.17.586.bin
It took about 60 seconds now
After restarting the module
- on TX1 is there something like "start console ok...."
- on TX0 is there OBK std output...
Next step was to set WiFi using std. procedure over OBK AP (192.168.4.x)
I had problems with the WiFi connection, because the antenna is on the power supply board, and I flashed it as just the module itself (meaning without the antenna). I had to put the module close (1m) to the WiFi AP to make it working. After soldering module later back into the power supply board, the WiFi worked normally.
Bulb has just two active pins to rule the BP5758.
I've discovered this:
A0 - BP5758D_CLK
A1 - BP5758D_DAT
Last thing was to change color map, because red was blue a blue was red.
I've added OBK Startup command to solve it:
BP5758D_Map 2 1 0 3 4
JSON:
Code: JSON
Everything OK, the bulb is working OK. The only strange thing is, that the internal temperature (on OBK module web status) is over 100°C, when the light is on.
Here the OBK web and config:
Here the HASS:
Here the pinout:
And finally the module pictures:
XJ_ wrote 140 posts with
rating 38 , helped 13 times.
Been with us since 2024 year.
Comments
Thank you for sharing. The used module seems similiar to CBLC5. Maybe it's an LN882HKI version of that? Here is original CBLC5: https://obrazki.elektroda.pl/9677894700_1716008948_thumb.jpg [Read more]
I agree, it looks like. Its pinout compatible. Unfortunately, I couldn't find anything on the module, what would appear to be a type. There is only a date on the QR code - 202401090239F. I couldn't even... [Read more]
There are few things that can be done to reduce the heating of your module: - first of all, you can enable PowerSave 1 in short startup command or in (if supported) LittleFS file autoexec.bat - then... [Read more]
The high temperature is a known problem, the module itself gets quite hot, the surrounding (especially with heating LEDs) will make it even hotter. You probably should try if powerSave 2 is an option... [Read more]
module also seen here https://www.elektroda.com/rtvforum/viewtopic.php?p=20983813#20983813 [Read more]
sorry, missed this [Read more]
The best way to get some info: https://www.elektroda.com/rtvforum/find.php?q=LN882HKI Second best way: https://openbekeniot.github.io/webapp/devicesList.html but we may need to improve search function... [Read more]
I've got 6 of those fxpot GU10 bulbs, for about $1.5 each. Except that they are bluetooth versions (AK801 mcu?), but otherwise are identical. I've replaced the modules with ESP8684-WROOM-07, each for about... [Read more]
how did you fit the module in there? ESP8684-WROOM-07 is twice as big. [Read more]
Bigger? I haven't noticed. It is the same form-factor, as CBLC5/WBLC5. According to espressif datasheet, dimensions are the same. From tuya: The CBLC5 dimensions are 8.5±0.35 mm (W)×12.7±0.35... [Read more]
of course you are right. I don't know why but I saw wroom 03. [Read more]
annoyingly this GU10 variant has the same model number as the E14 candle version. Here is template for devicelist: https://obrazki.elektroda.pl/8000552000_1730221394_thumb.jpg https://obrazki.elektroda.pl/2199639400_1730221259_thumb.jpg... [Read more]