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Flashing 3Stone 100W Smart Light Bulb [BP5758D + WB2L] - Using BK7231T Chip, Alexa Compatible

andy212332 
Close-up of 3Stone LED bulb showing technical specifications.
This is a firmware flashing guide for: [2023 Upgraded] Smart Light Bulbs (Pack of 4), 3Stone 100W Equivalent WiFi LED Color Changing Bulb Dimmable 2700K-6500K RGBCW, Works with Alexa, Google Home 2.4Ghz Only, A21 10W E26 Tunable White No Hub

Bought from: https://www.amazon.com/gp/product/B07HR8GT12
Screenshots:
Image of product 3Stone Smart Light Bulbs (4 pack), 100W equivalent, color-changing, dimmable.
Product ASIN B07HR8GT12

Followed the instructions here with some minor changes: https://www.youtube.com/watch?v=2e1SUQNMrgY


- Removed the LED board by using a long screwdriver and pushing down from the small end of the bulb. Trying to pry from the top will just break the plastic.
- No need to desolder the chip, you can get to the pins from the back.
- Did not have to use a separate power supply, 3.3v from the serial worked fine.
- Had to invert the Warm/Cool LED pins,


Screenshot of LED driver tools interface.


Code: JSON
Log in, to see the code



Close-up of 3Stone LED bulb showing technical specifications.
Close-up of an electronic module labeled WB2L.
Close-up of the LED layout on a light bulb's printed circuit board.
LED board with multicolored diodes and BP5758 chip.
Screwdriver inserted inside the case of a smart light bulb.
Image of the electronic circuit for flashing the firmware of a 3Stone LED bulb.
Circuit board with wires soldered for firmware flashing of the integrated circuit.
About Author
andy212332 wrote 5 posts with rating 1 . Been with us since 2023 year.

Comments

p.kaczmarek2 21 Oct 2023 09:05

You were very lucky that the programming pads were accessible just by a fraction of the board. It really makes the job easier, but I still really like desoldering WB2L just like on the video you linked. Now... [Read more]

andy212332 22 Oct 2023 17:44

Do you know if it's possible to make the bulbs brighter? I think that the bulbs were much brighter when they had the original Tuya firmware. [Read more]

p.kaczmarek2 22 Oct 2023 17:50

Yes, it is possible to make this kind of bulb brighter, you need to adjust the current limit of BP5758D. This can be done via console command, namely BP5758D_Current https://obrazki.elektroda.pl/7430665800_1697989752_thumb.jpg... [Read more]

andy212332 22 Oct 2023 18:04

Thanks, I'll check it out. Added after 13 [minutes]: Sorry to bother again, but is there a command to get the default current value? Just trying to see where it starts out at. [Read more]

p.kaczmarek2 23 Oct 2023 13:34

Hello @andy212332 , if you look at our driver source code, here: https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/driver/drv_bp5758d.c You can see that default values are: static... [Read more]

andy212332 25 Oct 2023 15:39

Thanks, "BP5758D_Current 40 40" seems to be around the same brightness as what it originally had. [Read more]

p.kaczmarek2 25 Oct 2023 21:14

Very well. You can now use that setting to regain full brightness. On a side note, I would also recommend looking into the PowerSave 1 command, which may slightly reduce the heating and the power consumption... [Read more]

andy212332 25 Oct 2023 21:15

ok I'll enable that too [Read more]

divadiow 07 Nov 2024 08:10

https://github.com/OpenBekenIOT/webapp/pull/158/commits/8950a6ff2217ee6776cbecabc64aa914f99c422f [Read more]

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