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Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown

NorthernMan54 717 2
  • This is a pretty straight forward LED Lighting kit, with a very simple tear down. It's best feature is support for RGB and Tunable White ( 2000K to 5000 K ). The internal part number is 50323.

    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown

    The module is within a plastic box attached to the LED, so you just need to undo one screw to open it and get access to the module.

    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown

    Connecting it to your uart is straight forward, and you do not need to remove it from the board or cut any traces. I just wired it up, started the upload with the command

    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown
    python3 uartprogram -d /dev/cu.SLAB_USBtoUART -w OpenBK7231T_UA_1.15.344.bin 

    And grounded CEN for a second for the upload to start.


    Taking a look at the wiring it appears to have these connections
    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown
    PMW0 - Blue
    PMW1 - Green
    PMW2 - Red

    PMW4 - W ( Not sure what W is )
    PMW5 - C ( Not sure what C is, color temperature ? )

    And in tracing the circuit, identified that it is using a pair of SM15633EK to drive the LED's. After some intense googling, found some details here on the chip - https://www.dianyuan.com/bbs/2511027.html

    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown
    Am currently trying to determine the configuration needed for OpenBeken, as the unit is constantly in white mode. ( maybe its defective ). I did for these details for a similar unit from globe - https://www.esphome-devices.com/devices/Globe-4-Inch-9W-Downlight-50359

    For a configuration I used this, and I also set Flag 3, so I could play with the PWM channels individually.

    Globe 4" Smart Recessed Led Lighting Kit RGBCW ( WB2S - BK7231T ) - Teardown

    Cool? Ranking DIY
    About Author
    NorthernMan54
    Level 2  
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    NorthernMan54 wrote 2 posts with rating 2. Been with us since 2023 year.
  • #2
    p.kaczmarek2
    Moderator Smart Home
    Hello, C is Cool White and W is Warm White. Those are channels used for CCT mode.

    Please do not set Flag 3 - [LED][Debug] Show raw PWM controller on WWW index instead of new LED RGB/CW/etc picker flag if you want to use our Temperature/RGB controls from OBK web panel.

    This device might seem to be in white mode all the time because it may require:
    Flag 8 - [LED] Alternate CW light mode (first PWM for warm/cold slider, second for brightness)
    Most of the devices are simply using PWMs to control Cool White and White Warm directly, but some drivers are using one PWM as a brightness setting and second PWM as a temperature setting. You may just need that flag.

    Futhermore, when setting flag 8, you also might need to change PWM channel 4 or 5 role to PWM_n. This should be done when you feel that brightness control or temperature control is inversed.

    We will be releasing a youtube guide for alternate CW mode shortly on our YT channel: https://www.youtube.com/@elektrodacom
  • #3
    NorthernMan54
    Level 2  
    Well after spending some time reviewing my work, I found my issue with the lights being stuck on white. I had a solder bridge between PMW4 and tx. After removing the bridge it worked perfectly.

    My final configuration

    P6 - PWM0 - 2
    P7 - PMW1 - 1
    P8 - PMW2 - 0

    P24 - PMW4 - 4
    P26 - PMW5 - 3

    I also tested Flag 8, and for this device it did not work correctly. So I left Flag 8 unset.

    Thanks for a great piece of firmware, it works really well. And once I enabled the home assistant integration, it was also discovered by homebridge-tasmota, and the device showed up immediately in the Apple Home App.